Linux Kernel Out-of-Bounds Write Vulnerability

cve CVE-2026-53266 3 sources, 3 claims · Watch

CISA Known Exploited Vulnerabilities writes:
Linux Kernel Out-of-Bounds Write Vulnerability Linux Kernel contains an out-of-bounds write vulnerability in the ebtables SNAT target which allows an ARP sender hardware address rewrite to write directly into a nonlinear socket-buffer fragment backed by a splice-imported file page. The impacted product(s) could be end-of-life (EoL) and/or end-of-service (EoS). Users are advised to discontinue use and/or transition to a supported version. Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in … the claim

Severity: HIGH NVD
important Red Hat
CVSS they disagree: 8.8 NVD
7.5 Red Hat
Exploited: yes CISA Known Exploited Vulnerabilities
Known ransomware campaign use: Unknown CISA Known Exploited Vulnerabilities
Due date: 2026-09-21 CISA Known Exploited Vulnerabilities
Fixed in: 5.5, 5.9, 5.10 NVD
Vendor: Linux CISA Known Exploited Vulnerabilities
Linux NVD
Product: Kernel CISA Known Exploited Vulnerabilities
Linux NVD
CWE: CWE-787 CISA Known Exploited Vulnerabilities
CWE-787 NVD
CWE-825 Red Hat

How far exploitation has got

No public code known
Proof of concept
Proof of concept, verified
A Metasploit module
Exploited in the wild · CISA Known Exploited Vulnerabilities 2026-09-18
Used in ransomware campaigns

Why the CVSS differs

Metric	NVD	Red Hat
Attack vector AV	local L	network N
Attack complexity AC	low L	high H
Privileges required PR	low L	low L
User interaction UI	none N	none N
Scope S	changed C	unchanged U
Confidentiality C	high H	high H
Integrity I	high H	high H
Availability A	high H	high H

Each source scores the same vulnerability from what it judges the attack to need. The rows marked are where they judge it differently.

Timeline

2026-06-01	first spoke of it: kernel: netfilter: ebtables SNAT target writes to shared memory pages during ARP hardware address rewrite	Red Hat
2026-06-25	first spoke of it: Linux Kernel Out-of-Bounds Write Vulnerability	NVD
2026-09-18	first spoke of it: Linux Kernel Out-of-Bounds Write Vulnerability	CISA Known Exploited Vulnerabilities
2026-09-21	Due date	CISA Known Exploited Vulnerabilities

What it is to other things

affects	linux/linux_kernel NVD
made_by	linux NVD

In words only, so not counted until a person confirms one:

affects	`linux/kernel` CISA Known Exploited Vulnerabilities says “Linux · Kernel”
affects	`linux/linux` NVD says “Linux · Linux”

Every value, with what each source said and its receipt

Property Source Said Means here

Automatable

automatable

NVD

At least one of those steps needs a person.

receipt

Source: NVD
Its words: no
Read by: field:cve.metrics.ssvcV203[].ssvcData.options[].automatable
Said since: 2026-10-06 12:29 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:29 UTC	no
2026-09-29 09:45 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "Linux",
            "programFiles": [
              "net/bridge/netfilter/ebt_snat.c"
            ],
            "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
            "vendor": "Linux",
            "versions": [
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                "status": "affected",
                "version": "63137bc5882a1882c553d389fdeeeace86ee1741",
                "versionType": "git"
              },
              {
                "lessThan": "76280b78cc9f23bdc6438e10ad6dff148ef8375b",
                "status": "affected",
                "version": "63137bc5882a1882c553d389fdeeeace86ee1741",
                "versionType": "git"
              },
              {
                "lessThan": "b7e91939ba9be805a62a257fa4e227dffbb88fa0",
                "status": "affected",
                "version": "63137bc5882a1882c553d389fdeeeace86ee1741",
                "versionType": "git"
              },
              {
                "lessThan": "afd64b59c3de9bbbdd3759e834fdc55cda716e0b",
                "status": "affected",
                "version": "63137bc5882a1882c553d389fdeeeace86ee1741",
                "versionType": "git"
              },
              {
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                "status": "affected",
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                "versionType": "git"
              },
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              },
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              },
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                "versionType": "git"
              },
              {
                "status": "affected",
                "version": "2f3839075a5f8dcf116c1abe35b36b018ac62445",
                "versionType": "git"
              },
              {
                "status": "affected",
                "version": "51ba2945a8ef65ae437c8f9ba05f0343aa82ae5b",
                "versionType": "git"
              },
              {
                "status": "affected",
                "version": "b7d23c2c87584eb429f115c078ed511be8b18e29",
                "versionType": "git"
              },
              {
                "lessThan": "5.5",
                "status": "affected",
                "version": "5.4.73",
                "versionType": "semver"
              },
              {
                "lessThan": "5.9",
                "status": "affected",
                "version": "5.8.17",
                "versionType": "semver"
              },
              {
                "lessThan": "5.10",
                "status": "affected",
                "version": "5.9.2",
                "versionType": "semver"
              }
            ]
          },
          {
            "defaultStatus": "affected",
            "product": "Linux",
            "programFiles": [
              "net/bridge/netfilter/ebt_snat.c"
            ],
            "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
            "vendor": "Linux",
            "versions": [
              {
                "status": "affected",
                "version": "5.10"
              },
              {
                "lessThan": "5.10",
                "status": "unaffected",
                "version": "0",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "5.10.*",
                "status": "unaffected",
                "version": "5.10.259",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "5.15.*",
                "status": "unaffected",
                "version": "5.15.210",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.1.*",
                "status": "unaffected",
                "version": "6.1.176",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.6.*",
                "status": "unaffected",
                "version": "6.6.143",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.12.*",
                "status": "unaffected",
                "version": "6.12.94",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.18.*",
                "status": "unaffected",
                "version": "6.18.36",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "7.0.*",
                "status": "unaffected",
                "version": "7.0.13",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "7.1",
                "versionType": "original_commit_for_fix"
              }
            ]
          }
        ],
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
      }
    ],
    "cisaActionDue": "2026-09-21",
    "cisaExploitAdd": "2026-09-18",
    "cisaRequiredAction": "Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.",
    "cisaVulnerabilityName": "Linux Kernel Out-of-Bounds Write Vulnerability",
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "886AB560-B760-44F0-AD89-3F275E4C0F58",
                "versionEndExcluding": "5.5",
                "versionStartIncluding": "5.4.73",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "BEFC3ACE-365D-48E7-9C0A-019C74CC0725",
                "versionEndExcluding": "5.9",
                "versionStartIncluding": "5.8.17",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "992FFB71-217E-40A6-B8BD-5AA742898F28",
                "versionEndExcluding": "5.10.259",
                "versionStartIncluding": "5.9.2",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "5E938CDF-D1C4-43D0-98DC-9E11B6B55801",
                "versionEndExcluding": "5.15.210",
                "versionStartIncluding": "5.11",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "C4446623-5F2B-4DD8-8666-9FAAC285A757",
                "versionEndExcluding": "6.1.176",
                "versionStartIncluding": "5.16",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "9062F1CD-CAD6-4EA2-A73F-C06D4A887B8C",
                "versionEndExcluding": "6.6.143",
                "versionStartIncluding": "6.2",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "85421C0C-ABDE-4357-971C-67F9087DE1B9",
                "versionEndExcluding": "6.12.94",
                "versionStartIncluding": "6.7",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "389025D2-958D-41BD-BD96-70ED1033A9F3",
                "versionEndExcluding": "6.18.36",
                "versionStartIncluding": "6.13",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "6A64BF9F-3BCA-42FD-98CB-8F03474D2B1E",
                "versionEndExcluding": "7.0.13",
                "versionStartIncluding": "6.19",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*",
                "matchCriteriaId": "B1EF7059-E670-45F4-B422-54C40FA86390",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*",
                "matchCriteriaId": "0D38F0BF-A728-4133-A358-D44A2F7EE6D6",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*",
                "matchCriteriaId": "EC732D08-5F7B-46D9-B154-E60C7F4F0A97",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:*",
                "matchCriteriaId": "E5910A9D-F60A-409A-B486-FE66BFEBA9B9",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:*",
                "matchCriteriaId": "81DFF19E-9CF8-49C6-8C36-1E4038622933",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc6:*:*:*:*:*:*",
                "matchCriteriaId": "B0E8FC71-3952-444C-83E9-718DBBBEC615",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: bridge: make ebt_snat ARP rewrite writable\n\nThe ebtables SNAT target keeps the Ethernet source address rewrite\nbehind skb_ensure_writable(skb, 0).  This is intentional: at the bridge\nebtables hooks the Ethernet header is addressed through\nskb_mac_header()/eth_hdr(), while skb->data points at the Ethernet\npayload.  Asking skb_ensure_writable() for ETH_HLEN bytes would check\nthe payload, not the Ethernet header, and would reintroduce the small\npacket regression fixed by commit 63137bc5882a.\n\nHowever, the optional ARP sender hardware address rewrite is different.\nIt writes through skb_store_bits() at an offset relative to skb->data:\n\n        skb_store_bits(skb, sizeof(struct arphdr), info->mac, ETH_ALEN)\n\nskb_header_pointer() only safely reads the ARP header; it does not make\nthe later sender hardware address range writable.  If that range is\nstill held in a nonlinear skb fragment backed by a splice-imported file\npage, skb_store_bits() maps the frag page and copies the new MAC address\ndirectly into it.\n\nEnsure the ARP SHA range is writable before reading the ARP header and\nbefore calling skb_store_bits()."
      }
    ],
    "id": "CVE-2026-53266",
    "lastModified": "2026-09-19T04:17:53.580",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.0,
          "impactScore": 6.0,
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-53266",
            "options": [
              {
                "exploitation": "active"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "total"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-18T00:00:00+00:00",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-06-25T09:16:44.643",
    "references": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/153ea96c806aea395daba907a4f88480b6ad5093"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/67ba971ae02514d85818fe0c32549ab4bfa3bf49"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/76280b78cc9f23bdc6438e10ad6dff148ef8375b"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/afd64b59c3de9bbbdd3759e834fdc55cda716e0b"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
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        ],
        "url": "https://git.kernel.org/stable/c/b18675263db1147c8e1cab625400c13a0d87bd2d"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/b7e91939ba9be805a62a257fa4e227dffbb88fa0"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/bf84ad7c7a9ede46e31afaa41a1ba06a159e8c87"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/c9b5ff59feffb92a147a84a5aa28acd2cb8ff4c5"
      },
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "tags": [
          "US Government Resource"
        ],
        "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-53266"
      }
    ],
    "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "NVD-CWE-noinfo"
          }
        ],
        "source": "nvd@nist.gov",
        "type": "Primary"
      },
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-787"
          }
        ],
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  }
}

—

CVSS

cvss

conflict

NVD

8.8

receipt

Source: NVD
Its words: 8.8
Read by: field:cve.metrics.cvssMetricV31[type=Primary].cvssData.baseScore || field:cve.metrics.cvssMetricV31[].cvssData.baseScore
Said since: 2026-09-29 09:45 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "Linux",
            "programFiles": [
              "net/bridge/netfilter/ebt_snat.c"
            ],
            "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
            "vendor": "Linux",
            "versions": [
              {
                "lessThan": "bf84ad7c7a9ede46e31afaa41a1ba06a159e8c87",
                "status": "affected",
                "version": "63137bc5882a1882c553d389fdeeeace86ee1741",
                "versionType": "git"
              },
              {
                "lessThan": "76280b78cc9f23bdc6438e10ad6dff148ef8375b",
                "status": "affected",
                "version": "63137bc5882a1882c553d389fdeeeace86ee1741",
                "versionType": "git"
              },
              {
                "lessThan": "b7e91939ba9be805a62a257fa4e227dffbb88fa0",
                "status": "affected",
                "version": "63137bc5882a1882c553d389fdeeeace86ee1741",
                "versionType": "git"
              },
              {
                "lessThan": "afd64b59c3de9bbbdd3759e834fdc55cda716e0b",
                "status": "affected",
                "version": "63137bc5882a1882c553d389fdeeeace86ee1741",
                "versionType": "git"
              },
              {
                "lessThan": "153ea96c806aea395daba907a4f88480b6ad5093",
                "status": "affected",
                "version": "63137bc5882a1882c553d389fdeeeace86ee1741",
                "versionType": "git"
              },
              {
                "lessThan": "b18675263db1147c8e1cab625400c13a0d87bd2d",
                "status": "affected",
                "version": "63137bc5882a1882c553d389fdeeeace86ee1741",
                "versionType": "git"
              },
              {
                "lessThan": "c9b5ff59feffb92a147a84a5aa28acd2cb8ff4c5",
                "status": "affected",
                "version": "63137bc5882a1882c553d389fdeeeace86ee1741",
                "versionType": "git"
              },
              {
                "lessThan": "67ba971ae02514d85818fe0c32549ab4bfa3bf49",
                "status": "affected",
                "version": "63137bc5882a1882c553d389fdeeeace86ee1741",
                "versionType": "git"
              },
              {
                "status": "affected",
                "version": "2f3839075a5f8dcf116c1abe35b36b018ac62445",
                "versionType": "git"
              },
              {
                "status": "affected",
                "version": "51ba2945a8ef65ae437c8f9ba05f0343aa82ae5b",
                "versionType": "git"
              },
              {
                "status": "affected",
                "version": "b7d23c2c87584eb429f115c078ed511be8b18e29",
                "versionType": "git"
              },
              {
                "lessThan": "5.5",
                "status": "affected",
                "version": "5.4.73",
                "versionType": "semver"
              },
              {
                "lessThan": "5.9",
                "status": "affected",
                "version": "5.8.17",
                "versionType": "semver"
              },
              {
                "lessThan": "5.10",
                "status": "affected",
                "version": "5.9.2",
                "versionType": "semver"
              }
            ]
          },
          {
            "defaultStatus": "affected",
            "product": "Linux",
            "programFiles": [
              "net/bridge/netfilter/ebt_snat.c"
            ],
            "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
            "vendor": "Linux",
            "versions": [
              {
                "status": "affected",
                "version": "5.10"
              },
              {
                "lessThan": "5.10",
                "status": "unaffected",
                "version": "0",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "5.10.*",
                "status": "unaffected",
                "version": "5.10.259",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "5.15.*",
                "status": "unaffected",
                "version": "5.15.210",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.1.*",
                "status": "unaffected",
                "version": "6.1.176",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.6.*",
                "status": "unaffected",
                "version": "6.6.143",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.12.*",
                "status": "unaffected",
                "version": "6.12.94",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.18.*",
                "status": "unaffected",
                "version": "6.18.36",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "7.0.*",
                "status": "unaffected",
                "version": "7.0.13",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "7.1",
                "versionType": "original_commit_for_fix"
              }
            ]
          }
        ],
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
      }
    ],
    "cisaActionDue": "2026-09-21",
    "cisaExploitAdd": "2026-09-18",
    "cisaRequiredAction": "Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.",
    "cisaVulnerabilityName": "Linux Kernel Out-of-Bounds Write Vulnerability",
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
              {
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                "versionEndExcluding": "5.5",
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                "vulnerable": true
              },
              {
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                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*",
                "matchCriteriaId": "B1EF7059-E670-45F4-B422-54C40FA86390",
                "vulnerable": true
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              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*",
                "matchCriteriaId": "0D38F0BF-A728-4133-A358-D44A2F7EE6D6",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*",
                "matchCriteriaId": "EC732D08-5F7B-46D9-B154-E60C7F4F0A97",
                "vulnerable": true
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              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:*",
                "matchCriteriaId": "E5910A9D-F60A-409A-B486-FE66BFEBA9B9",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:*",
                "matchCriteriaId": "81DFF19E-9CF8-49C6-8C36-1E4038622933",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc6:*:*:*:*:*:*",
                "matchCriteriaId": "B0E8FC71-3952-444C-83E9-718DBBBEC615",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: bridge: make ebt_snat ARP rewrite writable\n\nThe ebtables SNAT target keeps the Ethernet source address rewrite\nbehind skb_ensure_writable(skb, 0).  This is intentional: at the bridge\nebtables hooks the Ethernet header is addressed through\nskb_mac_header()/eth_hdr(), while skb->data points at the Ethernet\npayload.  Asking skb_ensure_writable() for ETH_HLEN bytes would check\nthe payload, not the Ethernet header, and would reintroduce the small\npacket regression fixed by commit 63137bc5882a.\n\nHowever, the optional ARP sender hardware address rewrite is different.\nIt writes through skb_store_bits() at an offset relative to skb->data:\n\n        skb_store_bits(skb, sizeof(struct arphdr), info->mac, ETH_ALEN)\n\nskb_header_pointer() only safely reads the ARP header; it does not make\nthe later sender hardware address range writable.  If that range is\nstill held in a nonlinear skb fragment backed by a splice-imported file\npage, skb_store_bits() maps the frag page and copies the new MAC address\ndirectly into it.\n\nEnsure the ARP SHA range is writable before reading the ARP header and\nbefore calling skb_store_bits()."
      }
    ],
    "id": "CVE-2026-53266",
    "lastModified": "2026-09-19T04:17:53.580",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.0,
          "impactScore": 6.0,
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-53266",
            "options": [
              {
                "exploitation": "active"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "total"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-18T00:00:00+00:00",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-06-25T09:16:44.643",
    "references": [
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        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      },
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        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      },
      {
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      },
      {
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      },
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "tags": [
          "US Government Resource"
        ],
        "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-53266"
      }
    ],
    "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "NVD-CWE-noinfo"
          }
        ],
        "source": "nvd@nist.gov",
        "type": "Primary"
      },
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-787"
          }
        ],
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  }
}

—

CVSS

cvss

conflict

Red Hat

7.5

receipt

Source: Red Hat
Its words: 7.5
Read by: field:cvss3_score
Said since: 2026-09-29 09:44 UTC
Last answered: 2026-10-06 13:02 UTC
Original: open at the source

What the source handed over

{
  "CVE": "CVE-2026-53266",
  "CWE": "CWE-825",
  "advisories": [
    "RHSA-2026:73732",
    "RHSA-2026:71233",
    "RHSA-2026:71687",
    "RHSA-2026:72059",
    "RHSA-2026:71565",
    "RHSA-2026:71326",
    "RHSA-2026:71601",
    "RHSA-2026:70797",
    "RHSA-2026:71325",
    "RHSA-2026:71657",
    "RHSA-2026:36645",
    "RHSA-2026:71569",
    "RHSA-2026:71327",
    "RHSA-2026:71606",
    "RHSA-2026:39082",
    "RHSA-2026:39083"
  ],
  "affected_packages": [
    "kernel-rt-0:3.10.0-1160.164.1.rt56.1316.el7",
    "kernel-0:6.12.0-211.59.1.el10_2",
    "kernel-0:4.18.0-477.169.1.el8_8",
    "kernel-0:4.18.0-305.209.1.el8_4",
    "kernel-0:4.18.0-372.217.1.el8_6",
    "kernel-0:4.18.0-553.143.1.el8_10",
    "kernel-rt-0:4.18.0-553.143.1.rt7.484.el8_10",
    "kernel-0:6.12.0-55.106.1.el10_0",
    "kernel-0:5.14.0-687.23.1.el9_8",
    "kernel-0:3.10.0-1160.164.1.el7",
    "kernel-0:5.14.0-427.152.1.el9_4",
    "kernel-rt-0:5.14.0-284.194.1.rt14.479.el9_2",
    "kernel-0:5.14.0-570.143.1.el9_6",
    "kernel-0:6.12.0-231.20.el10nv",
    "kernel-0:5.14.0-284.194.1.el9_2",
    "kernel-0:2.6.32-754.64.1.el6"
  ],
  "bugzilla": "2485368",
  "bugzilla_description": "kernel: netfilter: ebtables SNAT target writes to shared memory pages during ARP hardware address rewrite",
  "cvss3_score": "7.5",
  "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2026-06-01T12:00:00Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-53266.json",
  "severity": "important"
}

—

CVSS vector

cvss_vector

not compared

NVD

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

receipt

Source: NVD
Its words: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Read by: field:cve.metrics.cvssMetricV31[type=Primary].cvssData.vectorString || field:cve.metrics.cvssMetricV31[].cvssData.vectorString
Said since: 2026-10-06 12:29 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:29 UTC	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
2026-09-29 09:45 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "Linux",
            "programFiles": [
              "net/bridge/netfilter/ebt_snat.c"
            ],
            "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
            "vendor": "Linux",
            "versions": [
              {
                "lessThan": "bf84ad7c7a9ede46e31afaa41a1ba06a159e8c87",
                "status": "affected",
                "version": "63137bc5882a1882c553d389fdeeeace86ee1741",
                "versionType": "git"
              },
              {
                "lessThan": "76280b78cc9f23bdc6438e10ad6dff148ef8375b",
                "status": "affected",
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                "versionType": "git"
              },
              {
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                "status": "affected",
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                "versionType": "git"
              },
              {
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                "status": "affected",
                "version": "63137bc5882a1882c553d389fdeeeace86ee1741",
                "versionType": "git"
              },
              {
                "lessThan": "153ea96c806aea395daba907a4f88480b6ad5093",
                "status": "affected",
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                "versionType": "git"
              },
              {
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                "status": "affected",
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                "versionType": "git"
              },
              {
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                "status": "affected",
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                "versionType": "git"
              },
              {
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                "status": "affected",
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                "versionType": "git"
              },
              {
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              },
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              },
              {
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              },
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                "status": "affected",
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                "versionType": "semver"
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              {
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              },
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                "status": "affected",
                "version": "5.9.2",
                "versionType": "semver"
              }
            ]
          },
          {
            "defaultStatus": "affected",
            "product": "Linux",
            "programFiles": [
              "net/bridge/netfilter/ebt_snat.c"
            ],
            "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
            "vendor": "Linux",
            "versions": [
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                "status": "affected",
                "version": "5.10"
              },
              {
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                "status": "unaffected",
                "version": "0",
                "versionType": "semver"
              },
              {
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                "status": "unaffected",
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              {
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                "status": "unaffected",
                "version": "6.1.176",
                "versionType": "semver"
              },
              {
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                "status": "unaffected",
                "version": "6.6.143",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.12.*",
                "status": "unaffected",
                "version": "6.12.94",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.18.*",
                "status": "unaffected",
                "version": "6.18.36",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "7.0.*",
                "status": "unaffected",
                "version": "7.0.13",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "7.1",
                "versionType": "original_commit_for_fix"
              }
            ]
          }
        ],
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
      }
    ],
    "cisaActionDue": "2026-09-21",
    "cisaExploitAdd": "2026-09-18",
    "cisaRequiredAction": "Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.",
    "cisaVulnerabilityName": "Linux Kernel Out-of-Bounds Write Vulnerability",
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "886AB560-B760-44F0-AD89-3F275E4C0F58",
                "versionEndExcluding": "5.5",
                "versionStartIncluding": "5.4.73",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "BEFC3ACE-365D-48E7-9C0A-019C74CC0725",
                "versionEndExcluding": "5.9",
                "versionStartIncluding": "5.8.17",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "992FFB71-217E-40A6-B8BD-5AA742898F28",
                "versionEndExcluding": "5.10.259",
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                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "5E938CDF-D1C4-43D0-98DC-9E11B6B55801",
                "versionEndExcluding": "5.15.210",
                "versionStartIncluding": "5.11",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "C4446623-5F2B-4DD8-8666-9FAAC285A757",
                "versionEndExcluding": "6.1.176",
                "versionStartIncluding": "5.16",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "9062F1CD-CAD6-4EA2-A73F-C06D4A887B8C",
                "versionEndExcluding": "6.6.143",
                "versionStartIncluding": "6.2",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "85421C0C-ABDE-4357-971C-67F9087DE1B9",
                "versionEndExcluding": "6.12.94",
                "versionStartIncluding": "6.7",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "389025D2-958D-41BD-BD96-70ED1033A9F3",
                "versionEndExcluding": "6.18.36",
                "versionStartIncluding": "6.13",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "6A64BF9F-3BCA-42FD-98CB-8F03474D2B1E",
                "versionEndExcluding": "7.0.13",
                "versionStartIncluding": "6.19",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*",
                "matchCriteriaId": "B1EF7059-E670-45F4-B422-54C40FA86390",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*",
                "matchCriteriaId": "0D38F0BF-A728-4133-A358-D44A2F7EE6D6",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*",
                "matchCriteriaId": "EC732D08-5F7B-46D9-B154-E60C7F4F0A97",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:*",
                "matchCriteriaId": "E5910A9D-F60A-409A-B486-FE66BFEBA9B9",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:*",
                "matchCriteriaId": "81DFF19E-9CF8-49C6-8C36-1E4038622933",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc6:*:*:*:*:*:*",
                "matchCriteriaId": "B0E8FC71-3952-444C-83E9-718DBBBEC615",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: bridge: make ebt_snat ARP rewrite writable\n\nThe ebtables SNAT target keeps the Ethernet source address rewrite\nbehind skb_ensure_writable(skb, 0).  This is intentional: at the bridge\nebtables hooks the Ethernet header is addressed through\nskb_mac_header()/eth_hdr(), while skb->data points at the Ethernet\npayload.  Asking skb_ensure_writable() for ETH_HLEN bytes would check\nthe payload, not the Ethernet header, and would reintroduce the small\npacket regression fixed by commit 63137bc5882a.\n\nHowever, the optional ARP sender hardware address rewrite is different.\nIt writes through skb_store_bits() at an offset relative to skb->data:\n\n        skb_store_bits(skb, sizeof(struct arphdr), info->mac, ETH_ALEN)\n\nskb_header_pointer() only safely reads the ARP header; it does not make\nthe later sender hardware address range writable.  If that range is\nstill held in a nonlinear skb fragment backed by a splice-imported file\npage, skb_store_bits() maps the frag page and copies the new MAC address\ndirectly into it.\n\nEnsure the ARP SHA range is writable before reading the ARP header and\nbefore calling skb_store_bits()."
      }
    ],
    "id": "CVE-2026-53266",
    "lastModified": "2026-09-19T04:17:53.580",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.0,
          "impactScore": 6.0,
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-53266",
            "options": [
              {
                "exploitation": "active"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "total"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-18T00:00:00+00:00",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-06-25T09:16:44.643",
    "references": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/153ea96c806aea395daba907a4f88480b6ad5093"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/67ba971ae02514d85818fe0c32549ab4bfa3bf49"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/76280b78cc9f23bdc6438e10ad6dff148ef8375b"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/afd64b59c3de9bbbdd3759e834fdc55cda716e0b"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/b18675263db1147c8e1cab625400c13a0d87bd2d"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/b7e91939ba9be805a62a257fa4e227dffbb88fa0"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/bf84ad7c7a9ede46e31afaa41a1ba06a159e8c87"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/c9b5ff59feffb92a147a84a5aa28acd2cb8ff4c5"
      },
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "tags": [
          "US Government Resource"
        ],
        "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-53266"
      }
    ],
    "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "NVD-CWE-noinfo"
          }
        ],
        "source": "nvd@nist.gov",
        "type": "Primary"
      },
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-787"
          }
        ],
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  }
}

—

CVSS vector

cvss_vector

not compared

Red Hat

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

receipt

Source: Red Hat
Its words: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Read by: field:cvss3_scoring_vector
Said since: 2026-10-06 13:01 UTC
Last answered: 2026-10-06 13:02 UTC
Original: open at the source

2026-10-06 13:01 UTC	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
2026-09-29 09:44 UTC	—

What the source handed over

{
  "CVE": "CVE-2026-53266",
  "CWE": "CWE-825",
  "advisories": [
    "RHSA-2026:73732",
    "RHSA-2026:71233",
    "RHSA-2026:71687",
    "RHSA-2026:72059",
    "RHSA-2026:71565",
    "RHSA-2026:71326",
    "RHSA-2026:71601",
    "RHSA-2026:70797",
    "RHSA-2026:71325",
    "RHSA-2026:71657",
    "RHSA-2026:36645",
    "RHSA-2026:71569",
    "RHSA-2026:71327",
    "RHSA-2026:71606",
    "RHSA-2026:39082",
    "RHSA-2026:39083"
  ],
  "affected_packages": [
    "kernel-rt-0:3.10.0-1160.164.1.rt56.1316.el7",
    "kernel-0:6.12.0-211.59.1.el10_2",
    "kernel-0:4.18.0-477.169.1.el8_8",
    "kernel-0:4.18.0-305.209.1.el8_4",
    "kernel-0:4.18.0-372.217.1.el8_6",
    "kernel-0:4.18.0-553.143.1.el8_10",
    "kernel-rt-0:4.18.0-553.143.1.rt7.484.el8_10",
    "kernel-0:6.12.0-55.106.1.el10_0",
    "kernel-0:5.14.0-687.23.1.el9_8",
    "kernel-0:3.10.0-1160.164.1.el7",
    "kernel-0:5.14.0-427.152.1.el9_4",
    "kernel-rt-0:5.14.0-284.194.1.rt14.479.el9_2",
    "kernel-0:5.14.0-570.143.1.el9_6",
    "kernel-0:6.12.0-231.20.el10nv",
    "kernel-0:5.14.0-284.194.1.el9_2",
    "kernel-0:2.6.32-754.64.1.el6"
  ],
  "bugzilla": "2485368",
  "bugzilla_description": "kernel: netfilter: ebtables SNAT target writes to shared memory pages during ARP hardware address rewrite",
  "cvss3_score": "7.5",
  "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2026-06-01T12:00:00Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-53266.json",
  "severity": "important"
}

—

CWE

cwe

different words

CISA Known Exploited Vulnerabilities

CWE-787

receipt

Source: CISA Known Exploited Vulnerabilities
Its words: CWE-787
Read by: field:cwes
Said since: 2026-10-06 12:19 UTC
Last answered: 2026-10-06 16:31 UTC

2026-10-06 12:19 UTC	CWE-787
2026-09-28 11:44 UTC	—

What the source handed over

{
  "cveID": "CVE-2026-53266",
  "cwes": "CWE-787",
  "dateAdded": "2026-09-18",
  "dueDate": "2026-09-21",
  "forensicTriage": "Yes",
  "knownRansomwareCampaignUse": "Unknown",
  "notes": "This vulnerability affects an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: ; https://git.kernel.org/stable/c/bf84ad7c7a9ede46e31afaa41a1ba06a159e8c87; https://git.kernel.org/stable/c/76280b78cc9f23bdc6438e10ad6dff148ef8375b; https://git.kernel.org/stable/c/b7e91939ba9be805a62a257fa4e227dffbb88fa0; https://git.kernel.org/stable/c/afd64b59c3de9bbbdd3759e834fdc55cda716e0b; https://git.kernel.org/stable/c/153ea96c806aea395daba907a4f88480b6ad5093; https://git.kernel.org/stable/c/b18675263db1147c8e1cab625400c13a0d87bd2d; https://git.kernel.org/stable/c/c9b5ff59feffb92a147a84a5aa28acd2cb8ff4c5; https://git.kernel.org/stable/c/67ba971ae02514d85818fe0c32549ab4bfa3bf49 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-53266",
  "product": "Kernel",
  "requiredAction": "Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.",
  "shortDescription": "Linux Kernel contains an out-of-bounds write vulnerability in the ebtables SNAT target which allows an ARP sender hardware address rewrite to write directly into a nonlinear socket-buffer fragment backed by a splice-imported file page. The impacted product(s) could be end-of-life (EoL) and/or end-of-service (EoS). Users are advised to discontinue use and/or transition to a supported version.",
  "vendorProject": "Linux",
  "vulnerabilityName": "Linux Kernel Out-of-Bounds Write Vulnerability"
}

—

CWE

cwe

different words

NVD

CWE-787

receipt

Source: NVD
Its words: CWE-787
Read by: field:cve.weaknesses[].description[].value
Said since: 2026-10-06 12:29 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:29 UTC	CWE-787
2026-09-29 09:45 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "Linux",
            "programFiles": [
              "net/bridge/netfilter/ebt_snat.c"
            ],
            "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
            "vendor": "Linux",
            "versions": [
              {
                "lessThan": "bf84ad7c7a9ede46e31afaa41a1ba06a159e8c87",
                "status": "affected",
                "version": "63137bc5882a1882c553d389fdeeeace86ee1741",
                "versionType": "git"
              },
              {
                "lessThan": "76280b78cc9f23bdc6438e10ad6dff148ef8375b",
                "status": "affected",
                "version": "63137bc5882a1882c553d389fdeeeace86ee1741",
                "versionType": "git"
              },
              {
                "lessThan": "b7e91939ba9be805a62a257fa4e227dffbb88fa0",
                "status": "affected",
                "version": "63137bc5882a1882c553d389fdeeeace86ee1741",
                "versionType": "git"
              },
              {
                "lessThan": "afd64b59c3de9bbbdd3759e834fdc55cda716e0b",
                "status": "affected",
                "version": "63137bc5882a1882c553d389fdeeeace86ee1741",
                "versionType": "git"
              },
              {
                "lessThan": "153ea96c806aea395daba907a4f88480b6ad5093",
                "status": "affected",
                "version": "63137bc5882a1882c553d389fdeeeace86ee1741",
                "versionType": "git"
              },
              {
                "lessThan": "b18675263db1147c8e1cab625400c13a0d87bd2d",
                "status": "affected",
                "version": "63137bc5882a1882c553d389fdeeeace86ee1741",
                "versionType": "git"
              },
              {
                "lessThan": "c9b5ff59feffb92a147a84a5aa28acd2cb8ff4c5",
                "status": "affected",
                "version": "63137bc5882a1882c553d389fdeeeace86ee1741",
                "versionType": "git"
              },
              {
                "lessThan": "67ba971ae02514d85818fe0c32549ab4bfa3bf49",
                "status": "affected",
                "version": "63137bc5882a1882c553d389fdeeeace86ee1741",
                "versionType": "git"
              },
              {
                "status": "affected",
                "version": "2f3839075a5f8dcf116c1abe35b36b018ac62445",
                "versionType": "git"
              },
              {
                "status": "affected",
                "version": "51ba2945a8ef65ae437c8f9ba05f0343aa82ae5b",
                "versionType": "git"
              },
              {
                "status": "affected",
                "version": "b7d23c2c87584eb429f115c078ed511be8b18e29",
                "versionType": "git"
              },
              {
                "lessThan": "5.5",
                "status": "affected",
                "version": "5.4.73",
                "versionType": "semver"
              },
              {
                "lessThan": "5.9",
                "status": "affected",
                "version": "5.8.17",
                "versionType": "semver"
              },
              {
                "lessThan": "5.10",
                "status": "affected",
                "version": "5.9.2",
                "versionType": "semver"
              }
            ]
          },
          {
            "defaultStatus": "affected",
            "product": "Linux",
            "programFiles": [
              "net/bridge/netfilter/ebt_snat.c"
            ],
            "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
            "vendor": "Linux",
            "versions": [
              {
                "status": "affected",
                "version": "5.10"
              },
              {
                "lessThan": "5.10",
                "status": "unaffected",
                "version": "0",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "5.10.*",
                "status": "unaffected",
                "version": "5.10.259",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "5.15.*",
                "status": "unaffected",
                "version": "5.15.210",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.1.*",
                "status": "unaffected",
                "version": "6.1.176",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.6.*",
                "status": "unaffected",
                "version": "6.6.143",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.12.*",
                "status": "unaffected",
                "version": "6.12.94",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.18.*",
                "status": "unaffected",
                "version": "6.18.36",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "7.0.*",
                "status": "unaffected",
                "version": "7.0.13",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "7.1",
                "versionType": "original_commit_for_fix"
              }
            ]
          }
        ],
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
      }
    ],
    "cisaActionDue": "2026-09-21",
    "cisaExploitAdd": "2026-09-18",
    "cisaRequiredAction": "Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.",
    "cisaVulnerabilityName": "Linux Kernel Out-of-Bounds Write Vulnerability",
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "886AB560-B760-44F0-AD89-3F275E4C0F58",
                "versionEndExcluding": "5.5",
                "versionStartIncluding": "5.4.73",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "BEFC3ACE-365D-48E7-9C0A-019C74CC0725",
                "versionEndExcluding": "5.9",
                "versionStartIncluding": "5.8.17",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "992FFB71-217E-40A6-B8BD-5AA742898F28",
                "versionEndExcluding": "5.10.259",
                "versionStartIncluding": "5.9.2",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "5E938CDF-D1C4-43D0-98DC-9E11B6B55801",
                "versionEndExcluding": "5.15.210",
                "versionStartIncluding": "5.11",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "C4446623-5F2B-4DD8-8666-9FAAC285A757",
                "versionEndExcluding": "6.1.176",
                "versionStartIncluding": "5.16",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "9062F1CD-CAD6-4EA2-A73F-C06D4A887B8C",
                "versionEndExcluding": "6.6.143",
                "versionStartIncluding": "6.2",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "85421C0C-ABDE-4357-971C-67F9087DE1B9",
                "versionEndExcluding": "6.12.94",
                "versionStartIncluding": "6.7",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "389025D2-958D-41BD-BD96-70ED1033A9F3",
                "versionEndExcluding": "6.18.36",
                "versionStartIncluding": "6.13",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "6A64BF9F-3BCA-42FD-98CB-8F03474D2B1E",
                "versionEndExcluding": "7.0.13",
                "versionStartIncluding": "6.19",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*",
                "matchCriteriaId": "B1EF7059-E670-45F4-B422-54C40FA86390",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*",
                "matchCriteriaId": "0D38F0BF-A728-4133-A358-D44A2F7EE6D6",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*",
                "matchCriteriaId": "EC732D08-5F7B-46D9-B154-E60C7F4F0A97",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:*",
                "matchCriteriaId": "E5910A9D-F60A-409A-B486-FE66BFEBA9B9",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:*",
                "matchCriteriaId": "81DFF19E-9CF8-49C6-8C36-1E4038622933",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc6:*:*:*:*:*:*",
                "matchCriteriaId": "B0E8FC71-3952-444C-83E9-718DBBBEC615",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: bridge: make ebt_snat ARP rewrite writable\n\nThe ebtables SNAT target keeps the Ethernet source address rewrite\nbehind skb_ensure_writable(skb, 0).  This is intentional: at the bridge\nebtables hooks the Ethernet header is addressed through\nskb_mac_header()/eth_hdr(), while skb->data points at the Ethernet\npayload.  Asking skb_ensure_writable() for ETH_HLEN bytes would check\nthe payload, not the Ethernet header, and would reintroduce the small\npacket regression fixed by commit 63137bc5882a.\n\nHowever, the optional ARP sender hardware address rewrite is different.\nIt writes through skb_store_bits() at an offset relative to skb->data:\n\n        skb_store_bits(skb, sizeof(struct arphdr), info->mac, ETH_ALEN)\n\nskb_header_pointer() only safely reads the ARP header; it does not make\nthe later sender hardware address range writable.  If that range is\nstill held in a nonlinear skb fragment backed by a splice-imported file\npage, skb_store_bits() maps the frag page and copies the new MAC address\ndirectly into it.\n\nEnsure the ARP SHA range is writable before reading the ARP header and\nbefore calling skb_store_bits()."
      }
    ],
    "id": "CVE-2026-53266",
    "lastModified": "2026-09-19T04:17:53.580",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.0,
          "impactScore": 6.0,
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-53266",
            "options": [
              {
                "exploitation": "active"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "total"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-18T00:00:00+00:00",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-06-25T09:16:44.643",
    "references": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/153ea96c806aea395daba907a4f88480b6ad5093"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/67ba971ae02514d85818fe0c32549ab4bfa3bf49"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/76280b78cc9f23bdc6438e10ad6dff148ef8375b"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/afd64b59c3de9bbbdd3759e834fdc55cda716e0b"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/b18675263db1147c8e1cab625400c13a0d87bd2d"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/b7e91939ba9be805a62a257fa4e227dffbb88fa0"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/bf84ad7c7a9ede46e31afaa41a1ba06a159e8c87"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/c9b5ff59feffb92a147a84a5aa28acd2cb8ff4c5"
      },
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "tags": [
          "US Government Resource"
        ],
        "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-53266"
      }
    ],
    "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "NVD-CWE-noinfo"
          }
        ],
        "source": "nvd@nist.gov",
        "type": "Primary"
      },
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-787"
          }
        ],
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  }
}

—

CWE

cwe

different words

Red Hat

CWE-825

receipt

Source: Red Hat
Its words: CWE-825
Read by: field:CWE
Said since: 2026-09-29 09:44 UTC
Last answered: 2026-10-06 13:02 UTC
Original: open at the source

What the source handed over

{
  "CVE": "CVE-2026-53266",
  "CWE": "CWE-825",
  "advisories": [
    "RHSA-2026:73732",
    "RHSA-2026:71233",
    "RHSA-2026:71687",
    "RHSA-2026:72059",
    "RHSA-2026:71565",
    "RHSA-2026:71326",
    "RHSA-2026:71601",
    "RHSA-2026:70797",
    "RHSA-2026:71325",
    "RHSA-2026:71657",
    "RHSA-2026:36645",
    "RHSA-2026:71569",
    "RHSA-2026:71327",
    "RHSA-2026:71606",
    "RHSA-2026:39082",
    "RHSA-2026:39083"
  ],
  "affected_packages": [
    "kernel-rt-0:3.10.0-1160.164.1.rt56.1316.el7",
    "kernel-0:6.12.0-211.59.1.el10_2",
    "kernel-0:4.18.0-477.169.1.el8_8",
    "kernel-0:4.18.0-305.209.1.el8_4",
    "kernel-0:4.18.0-372.217.1.el8_6",
    "kernel-0:4.18.0-553.143.1.el8_10",
    "kernel-rt-0:4.18.0-553.143.1.rt7.484.el8_10",
    "kernel-0:6.12.0-55.106.1.el10_0",
    "kernel-0:5.14.0-687.23.1.el9_8",
    "kernel-0:3.10.0-1160.164.1.el7",
    "kernel-0:5.14.0-427.152.1.el9_4",
    "kernel-rt-0:5.14.0-284.194.1.rt14.479.el9_2",
    "kernel-0:5.14.0-570.143.1.el9_6",
    "kernel-0:6.12.0-231.20.el10nv",
    "kernel-0:5.14.0-284.194.1.el9_2",
    "kernel-0:2.6.32-754.64.1.el6"
  ],
  "bugzilla": "2485368",
  "bugzilla_description": "kernel: netfilter: ebtables SNAT target writes to shared memory pages during ARP hardware address rewrite",
  "cvss3_score": "7.5",
  "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2026-06-01T12:00:00Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-53266.json",
  "severity": "important"
}

—

CWES

cwes

CISA Known Exploited Vulnerabilities

CWE-787

receipt

Source: CISA Known Exploited Vulnerabilities
Its words: CWE-787
Read by: field:cwes
Said since: 2026-09-28 11:44 UTC
Last answered: 2026-10-06 16:31 UTC

What the source handed over

{
  "cveID": "CVE-2026-53266",
  "cwes": "CWE-787",
  "dateAdded": "2026-09-18",
  "dueDate": "2026-09-21",
  "forensicTriage": "Yes",
  "knownRansomwareCampaignUse": "Unknown",
  "notes": "This vulnerability affects an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: ; https://git.kernel.org/stable/c/bf84ad7c7a9ede46e31afaa41a1ba06a159e8c87; https://git.kernel.org/stable/c/76280b78cc9f23bdc6438e10ad6dff148ef8375b; https://git.kernel.org/stable/c/b7e91939ba9be805a62a257fa4e227dffbb88fa0; https://git.kernel.org/stable/c/afd64b59c3de9bbbdd3759e834fdc55cda716e0b; https://git.kernel.org/stable/c/153ea96c806aea395daba907a4f88480b6ad5093; https://git.kernel.org/stable/c/b18675263db1147c8e1cab625400c13a0d87bd2d; https://git.kernel.org/stable/c/c9b5ff59feffb92a147a84a5aa28acd2cb8ff4c5; https://git.kernel.org/stable/c/67ba971ae02514d85818fe0c32549ab4bfa3bf49 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-53266",
  "product": "Kernel",
  "requiredAction": "Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.",
  "shortDescription": "Linux Kernel contains an out-of-bounds write vulnerability in the ebtables SNAT target which allows an ARP sender hardware address rewrite to write directly into a nonlinear socket-buffer fragment backed by a splice-imported file page. The impacted product(s) could be end-of-life (EoL) and/or end-of-service (EoS). Users are advised to discontinue use and/or transition to a supported version.",
  "vendorProject": "Linux",
  "vulnerabilityName": "Linux Kernel Out-of-Bounds Write Vulnerability"
}

—

Due date

due_date

CISA Known Exploited Vulnerabilities

2026-09-21

receipt

Source: CISA Known Exploited Vulnerabilities
Its words: 2026-09-21
Read by: field:dueDate
Said since: 2026-09-28 11:44 UTC
Last answered: 2026-10-06 16:31 UTC

What the source handed over

{
  "cveID": "CVE-2026-53266",
  "cwes": "CWE-787",
  "dateAdded": "2026-09-18",
  "dueDate": "2026-09-21",
  "forensicTriage": "Yes",
  "knownRansomwareCampaignUse": "Unknown",
  "notes": "This vulnerability affects an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: ; https://git.kernel.org/stable/c/bf84ad7c7a9ede46e31afaa41a1ba06a159e8c87; https://git.kernel.org/stable/c/76280b78cc9f23bdc6438e10ad6dff148ef8375b; https://git.kernel.org/stable/c/b7e91939ba9be805a62a257fa4e227dffbb88fa0; https://git.kernel.org/stable/c/afd64b59c3de9bbbdd3759e834fdc55cda716e0b; https://git.kernel.org/stable/c/153ea96c806aea395daba907a4f88480b6ad5093; https://git.kernel.org/stable/c/b18675263db1147c8e1cab625400c13a0d87bd2d; https://git.kernel.org/stable/c/c9b5ff59feffb92a147a84a5aa28acd2cb8ff4c5; https://git.kernel.org/stable/c/67ba971ae02514d85818fe0c32549ab4bfa3bf49 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-53266",
  "product": "Kernel",
  "requiredAction": "Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.",
  "shortDescription": "Linux Kernel contains an out-of-bounds write vulnerability in the ebtables SNAT target which allows an ARP sender hardware address rewrite to write directly into a nonlinear socket-buffer fragment backed by a splice-imported file page. The impacted product(s) could be end-of-life (EoL) and/or end-of-service (EoS). Users are advised to discontinue use and/or transition to a supported version.",
  "vendorProject": "Linux",
  "vulnerabilityName": "Linux Kernel Out-of-Bounds Write Vulnerability"
}

—

Exploitation

exploitation

NVD

active

Reliable evidence that it is exploited in the wild.

receipt

Source: NVD
Its words: active
Read by: field:cve.metrics.ssvcV203[].ssvcData.options[].exploitation
Said since: 2026-10-06 12:29 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:29 UTC	active
2026-09-29 09:45 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "Linux",
            "programFiles": [
              "net/bridge/netfilter/ebt_snat.c"
            ],
            "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
            "vendor": "Linux",
            "versions": [
              {
                "lessThan": "bf84ad7c7a9ede46e31afaa41a1ba06a159e8c87",
                "status": "affected",
                "version": "63137bc5882a1882c553d389fdeeeace86ee1741",
                "versionType": "git"
              },
              {
                "lessThan": "76280b78cc9f23bdc6438e10ad6dff148ef8375b",
                "status": "affected",
                "version": "63137bc5882a1882c553d389fdeeeace86ee1741",
                "versionType": "git"
              },
              {
                "lessThan": "b7e91939ba9be805a62a257fa4e227dffbb88fa0",
                "status": "affected",
                "version": "63137bc5882a1882c553d389fdeeeace86ee1741",
                "versionType": "git"
              },
              {
                "lessThan": "afd64b59c3de9bbbdd3759e834fdc55cda716e0b",
                "status": "affected",
                "version": "63137bc5882a1882c553d389fdeeeace86ee1741",
                "versionType": "git"
              },
              {
                "lessThan": "153ea96c806aea395daba907a4f88480b6ad5093",
                "status": "affected",
                "version": "63137bc5882a1882c553d389fdeeeace86ee1741",
                "versionType": "git"
              },
              {
                "lessThan": "b18675263db1147c8e1cab625400c13a0d87bd2d",
                "status": "affected",
                "version": "63137bc5882a1882c553d389fdeeeace86ee1741",
                "versionType": "git"
              },
              {
                "lessThan": "c9b5ff59feffb92a147a84a5aa28acd2cb8ff4c5",
                "status": "affected",
                "version": "63137bc5882a1882c553d389fdeeeace86ee1741",
                "versionType": "git"
              },
              {
                "lessThan": "67ba971ae02514d85818fe0c32549ab4bfa3bf49",
                "status": "affected",
                "version": "63137bc5882a1882c553d389fdeeeace86ee1741",
                "versionType": "git"
              },
              {
                "status": "affected",
                "version": "2f3839075a5f8dcf116c1abe35b36b018ac62445",
                "versionType": "git"
              },
              {
                "status": "affected",
                "version": "51ba2945a8ef65ae437c8f9ba05f0343aa82ae5b",
                "versionType": "git"
              },
              {
                "status": "affected",
                "version": "b7d23c2c87584eb429f115c078ed511be8b18e29",
                "versionType": "git"
              },
              {
                "lessThan": "5.5",
                "status": "affected",
                "version": "5.4.73",
                "versionType": "semver"
              },
              {
                "lessThan": "5.9",
                "status": "affected",
                "version": "5.8.17",
                "versionType": "semver"
              },
              {
                "lessThan": "5.10",
                "status": "affected",
                "version": "5.9.2",
                "versionType": "semver"
              }
            ]
          },
          {
            "defaultStatus": "affected",
            "product": "Linux",
            "programFiles": [
              "net/bridge/netfilter/ebt_snat.c"
            ],
            "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
            "vendor": "Linux",
            "versions": [
              {
                "status": "affected",
                "version": "5.10"
              },
              {
                "lessThan": "5.10",
                "status": "unaffected",
                "version": "0",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "5.10.*",
                "status": "unaffected",
                "version": "5.10.259",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "5.15.*",
                "status": "unaffected",
                "version": "5.15.210",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.1.*",
                "status": "unaffected",
                "version": "6.1.176",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.6.*",
                "status": "unaffected",
                "version": "6.6.143",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.12.*",
                "status": "unaffected",
                "version": "6.12.94",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.18.*",
                "status": "unaffected",
                "version": "6.18.36",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "7.0.*",
                "status": "unaffected",
                "version": "7.0.13",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "7.1",
                "versionType": "original_commit_for_fix"
              }
            ]
          }
        ],
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
      }
    ],
    "cisaActionDue": "2026-09-21",
    "cisaExploitAdd": "2026-09-18",
    "cisaRequiredAction": "Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.",
    "cisaVulnerabilityName": "Linux Kernel Out-of-Bounds Write Vulnerability",
    "configurations": [
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        "nodes": [
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            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: bridge: make ebt_snat ARP rewrite writable\n\nThe ebtables SNAT target keeps the Ethernet source address rewrite\nbehind skb_ensure_writable(skb, 0).  This is intentional: at the bridge\nebtables hooks the Ethernet header is addressed through\nskb_mac_header()/eth_hdr(), while skb->data points at the Ethernet\npayload.  Asking skb_ensure_writable() for ETH_HLEN bytes would check\nthe payload, not the Ethernet header, and would reintroduce the small\npacket regression fixed by commit 63137bc5882a.\n\nHowever, the optional ARP sender hardware address rewrite is different.\nIt writes through skb_store_bits() at an offset relative to skb->data:\n\n        skb_store_bits(skb, sizeof(struct arphdr), info->mac, ETH_ALEN)\n\nskb_header_pointer() only safely reads the ARP header; it does not make\nthe later sender hardware address range writable.  If that range is\nstill held in a nonlinear skb fragment backed by a splice-imported file\npage, skb_store_bits() maps the frag page and copies the new MAC address\ndirectly into it.\n\nEnsure the ARP SHA range is writable before reading the ARP header and\nbefore calling skb_store_bits()."
      }
    ],
    "id": "CVE-2026-53266",
    "lastModified": "2026-09-19T04:17:53.580",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.0,
          "impactScore": 6.0,
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        }
      ],
      "ssvcV203": [
        {
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          "ssvcData": {
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            "options": [
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              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "total"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-18T00:00:00+00:00",
            "version": "2.0.3"
          }
        }
      ]
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    "published": "2026-06-25T09:16:44.643",
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      },
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        "tags": [
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        "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-53266"
      }
    ],
    "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "vulnStatus": "Analyzed",
    "weaknesses": [
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        "description": [
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            "value": "NVD-CWE-noinfo"
          }
        ],
        "source": "nvd@nist.gov",
        "type": "Primary"
      },
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-787"
          }
        ],
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  }
}

—

Exploited

exploited

CISA Known Exploited Vulnerabilities

yes

receipt

Source: CISA Known Exploited Vulnerabilities
Its words: yes
Read by: const:yes
Said since: 2026-09-28 11:44 UTC
Last answered: 2026-10-06 16:31 UTC

What the source handed over

{
  "cveID": "CVE-2026-53266",
  "cwes": "CWE-787",
  "dateAdded": "2026-09-18",
  "dueDate": "2026-09-21",
  "forensicTriage": "Yes",
  "knownRansomwareCampaignUse": "Unknown",
  "notes": "This vulnerability affects an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: ; https://git.kernel.org/stable/c/bf84ad7c7a9ede46e31afaa41a1ba06a159e8c87; https://git.kernel.org/stable/c/76280b78cc9f23bdc6438e10ad6dff148ef8375b; https://git.kernel.org/stable/c/b7e91939ba9be805a62a257fa4e227dffbb88fa0; https://git.kernel.org/stable/c/afd64b59c3de9bbbdd3759e834fdc55cda716e0b; https://git.kernel.org/stable/c/153ea96c806aea395daba907a4f88480b6ad5093; https://git.kernel.org/stable/c/b18675263db1147c8e1cab625400c13a0d87bd2d; https://git.kernel.org/stable/c/c9b5ff59feffb92a147a84a5aa28acd2cb8ff4c5; https://git.kernel.org/stable/c/67ba971ae02514d85818fe0c32549ab4bfa3bf49 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-53266",
  "product": "Kernel",
  "requiredAction": "Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.",
  "shortDescription": "Linux Kernel contains an out-of-bounds write vulnerability in the ebtables SNAT target which allows an ARP sender hardware address rewrite to write directly into a nonlinear socket-buffer fragment backed by a splice-imported file page. The impacted product(s) could be end-of-life (EoL) and/or end-of-service (EoS). Users are advised to discontinue use and/or transition to a supported version.",
  "vendorProject": "Linux",
  "vulnerabilityName": "Linux Kernel Out-of-Bounds Write Vulnerability"
}

—

Fixed in

fixed_in

NVD

5.5, 5.9, 5.10

receipt

Source: NVD
Its words: 5.5, 5.9, 5.10
Read by: field:cve.affected[].affectedData[].versions[status=affected].lessThan
Said since: 2026-10-06 12:29 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:29 UTC	5.5, 5.9, 5.10
2026-09-29 09:45 UTC	—

What the source handed over

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              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*",
                "matchCriteriaId": "0D38F0BF-A728-4133-A358-D44A2F7EE6D6",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*",
                "matchCriteriaId": "EC732D08-5F7B-46D9-B154-E60C7F4F0A97",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:*",
                "matchCriteriaId": "E5910A9D-F60A-409A-B486-FE66BFEBA9B9",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:*",
                "matchCriteriaId": "81DFF19E-9CF8-49C6-8C36-1E4038622933",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc6:*:*:*:*:*:*",
                "matchCriteriaId": "B0E8FC71-3952-444C-83E9-718DBBBEC615",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: bridge: make ebt_snat ARP rewrite writable\n\nThe ebtables SNAT target keeps the Ethernet source address rewrite\nbehind skb_ensure_writable(skb, 0).  This is intentional: at the bridge\nebtables hooks the Ethernet header is addressed through\nskb_mac_header()/eth_hdr(), while skb->data points at the Ethernet\npayload.  Asking skb_ensure_writable() for ETH_HLEN bytes would check\nthe payload, not the Ethernet header, and would reintroduce the small\npacket regression fixed by commit 63137bc5882a.\n\nHowever, the optional ARP sender hardware address rewrite is different.\nIt writes through skb_store_bits() at an offset relative to skb->data:\n\n        skb_store_bits(skb, sizeof(struct arphdr), info->mac, ETH_ALEN)\n\nskb_header_pointer() only safely reads the ARP header; it does not make\nthe later sender hardware address range writable.  If that range is\nstill held in a nonlinear skb fragment backed by a splice-imported file\npage, skb_store_bits() maps the frag page and copies the new MAC address\ndirectly into it.\n\nEnsure the ARP SHA range is writable before reading the ARP header and\nbefore calling skb_store_bits()."
      }
    ],
    "id": "CVE-2026-53266",
    "lastModified": "2026-09-19T04:17:53.580",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.0,
          "impactScore": 6.0,
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-53266",
            "options": [
              {
                "exploitation": "active"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "total"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-18T00:00:00+00:00",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-06-25T09:16:44.643",
    "references": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/153ea96c806aea395daba907a4f88480b6ad5093"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/67ba971ae02514d85818fe0c32549ab4bfa3bf49"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/76280b78cc9f23bdc6438e10ad6dff148ef8375b"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/afd64b59c3de9bbbdd3759e834fdc55cda716e0b"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/b18675263db1147c8e1cab625400c13a0d87bd2d"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/b7e91939ba9be805a62a257fa4e227dffbb88fa0"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/bf84ad7c7a9ede46e31afaa41a1ba06a159e8c87"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/c9b5ff59feffb92a147a84a5aa28acd2cb8ff4c5"
      },
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "tags": [
          "US Government Resource"
        ],
        "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-53266"
      }
    ],
    "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "NVD-CWE-noinfo"
          }
        ],
        "source": "nvd@nist.gov",
        "type": "Primary"
      },
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-787"
          }
        ],
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  }
}

—

Forensic triage

forensic_triage

CISA Known Exploited Vulnerabilities

true

receipt

Source: CISA Known Exploited Vulnerabilities
Its words: Yes
Read by: field:forensicTriage
Said since: 2026-09-28 11:44 UTC
Last answered: 2026-10-06 16:31 UTC

What the source handed over

{
  "cveID": "CVE-2026-53266",
  "cwes": "CWE-787",
  "dateAdded": "2026-09-18",
  "dueDate": "2026-09-21",
  "forensicTriage": "Yes",
  "knownRansomwareCampaignUse": "Unknown",
  "notes": "This vulnerability affects an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: ; https://git.kernel.org/stable/c/bf84ad7c7a9ede46e31afaa41a1ba06a159e8c87; https://git.kernel.org/stable/c/76280b78cc9f23bdc6438e10ad6dff148ef8375b; https://git.kernel.org/stable/c/b7e91939ba9be805a62a257fa4e227dffbb88fa0; https://git.kernel.org/stable/c/afd64b59c3de9bbbdd3759e834fdc55cda716e0b; https://git.kernel.org/stable/c/153ea96c806aea395daba907a4f88480b6ad5093; https://git.kernel.org/stable/c/b18675263db1147c8e1cab625400c13a0d87bd2d; https://git.kernel.org/stable/c/c9b5ff59feffb92a147a84a5aa28acd2cb8ff4c5; https://git.kernel.org/stable/c/67ba971ae02514d85818fe0c32549ab4bfa3bf49 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-53266",
  "product": "Kernel",
  "requiredAction": "Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.",
  "shortDescription": "Linux Kernel contains an out-of-bounds write vulnerability in the ebtables SNAT target which allows an ARP sender hardware address rewrite to write directly into a nonlinear socket-buffer fragment backed by a splice-imported file page. The impacted product(s) could be end-of-life (EoL) and/or end-of-service (EoS). Users are advised to discontinue use and/or transition to a supported version.",
  "vendorProject": "Linux",
  "vulnerabilityName": "Linux Kernel Out-of-Bounds Write Vulnerability"
}

—

Known ransomware campaign use

known_ransomware_campaign_use

CISA Known Exploited Vulnerabilities

Unknown

receipt

Source: CISA Known Exploited Vulnerabilities
Its words: Unknown
Read by: field:knownRansomwareCampaignUse
Said since: 2026-09-28 11:44 UTC
Last answered: 2026-10-06 16:31 UTC

What the source handed over

{
  "cveID": "CVE-2026-53266",
  "cwes": "CWE-787",
  "dateAdded": "2026-09-18",
  "dueDate": "2026-09-21",
  "forensicTriage": "Yes",
  "knownRansomwareCampaignUse": "Unknown",
  "notes": "This vulnerability affects an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: ; https://git.kernel.org/stable/c/bf84ad7c7a9ede46e31afaa41a1ba06a159e8c87; https://git.kernel.org/stable/c/76280b78cc9f23bdc6438e10ad6dff148ef8375b; https://git.kernel.org/stable/c/b7e91939ba9be805a62a257fa4e227dffbb88fa0; https://git.kernel.org/stable/c/afd64b59c3de9bbbdd3759e834fdc55cda716e0b; https://git.kernel.org/stable/c/153ea96c806aea395daba907a4f88480b6ad5093; https://git.kernel.org/stable/c/b18675263db1147c8e1cab625400c13a0d87bd2d; https://git.kernel.org/stable/c/c9b5ff59feffb92a147a84a5aa28acd2cb8ff4c5; https://git.kernel.org/stable/c/67ba971ae02514d85818fe0c32549ab4bfa3bf49 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-53266",
  "product": "Kernel",
  "requiredAction": "Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.",
  "shortDescription": "Linux Kernel contains an out-of-bounds write vulnerability in the ebtables SNAT target which allows an ARP sender hardware address rewrite to write directly into a nonlinear socket-buffer fragment backed by a splice-imported file page. The impacted product(s) could be end-of-life (EoL) and/or end-of-service (EoS). Users are advised to discontinue use and/or transition to a supported version.",
  "vendorProject": "Linux",
  "vulnerabilityName": "Linux Kernel Out-of-Bounds Write Vulnerability"
}

—

Packages

packages

Red Hat

kernel-rt-0:3.10.0-1160.164.1.rt56.1316.el7, kernel-0:6.12.0-211.59.1.el10_2, kernel-0:4.18.0-477.169.1.el8_8, kernel-0:4.18.0-305.209.1.el8_4, kernel-0:4.18.0-372.217.1.el8_6, kernel-0:4.18.0-553.143.1.el8_10, kernel-rt-0:4.18.0-553.143.1.rt7.484.el8_10, kernel-0:6.12.0-55.106.1.el10_0, kernel-0:5.14.0-687.23.1.el9_8, kernel-0:3.10.0-1160.164.1.el7, kernel-0:5.14.0-427.152.1.el9_4, kernel-rt-0:5.14.0-284.194.1.rt14.479.el9_2, kernel-0:5.14.0-570.143.1.el9_6, kernel-0:6.12.0-231.20.el10nv, kernel-0:5.14.0-284.194.1.el9_2, kernel-0:2.6.32-754.64.1.el6

receipt

Source: Red Hat
Its words: kernel-rt-0:3.10.0-1160.164.1.rt56.1316.el7, kernel-0:6.12.0-211.59.1.el10_2, kernel-0:4.18.0-477.169.1.el8_8, kernel-0:4.18.0-305.209.1.el8_4, kernel-0:4.18.0-372.217.1.el8_6, kernel-0:4.18.0-553.143.1.el8_10, kernel-rt-0:4.18.0-553.143.1.rt7.484.el8_10, kernel-0:6.12.0-55.106.1.el10_0, kernel-0:5.14.0-687.23.1.el9_8, kernel-0:3.10.0-1160.164.1.el7, kernel-0:5.14.0-427.152.1.el9_4, kernel-rt-0:5.14.0-284.194.1.rt14.479.el9_2, kernel-0:5.14.0-570.143.1.el9_6, kernel-0:6.12.0-231.20.el10nv, kernel-0:5.14.0-284.194.1.el9_2, kernel-0:2.6.32-754.64.1.el6
Read by: field:affected_packages[]
Said since: 2026-10-06 13:01 UTC
Last answered: 2026-10-06 13:02 UTC
Original: open at the source

2026-10-06 13:01 UTC

2026-09-29 09:44 UTC

What the source handed over

{
  "CVE": "CVE-2026-53266",
  "CWE": "CWE-825",
  "advisories": [
    "RHSA-2026:73732",
    "RHSA-2026:71233",
    "RHSA-2026:71687",
    "RHSA-2026:72059",
    "RHSA-2026:71565",
    "RHSA-2026:71326",
    "RHSA-2026:71601",
    "RHSA-2026:70797",
    "RHSA-2026:71325",
    "RHSA-2026:71657",
    "RHSA-2026:36645",
    "RHSA-2026:71569",
    "RHSA-2026:71327",
    "RHSA-2026:71606",
    "RHSA-2026:39082",
    "RHSA-2026:39083"
  ],
  "affected_packages": [
    "kernel-rt-0:3.10.0-1160.164.1.rt56.1316.el7",
    "kernel-0:6.12.0-211.59.1.el10_2",
    "kernel-0:4.18.0-477.169.1.el8_8",
    "kernel-0:4.18.0-305.209.1.el8_4",
    "kernel-0:4.18.0-372.217.1.el8_6",
    "kernel-0:4.18.0-553.143.1.el8_10",
    "kernel-rt-0:4.18.0-553.143.1.rt7.484.el8_10",
    "kernel-0:6.12.0-55.106.1.el10_0",
    "kernel-0:5.14.0-687.23.1.el9_8",
    "kernel-0:3.10.0-1160.164.1.el7",
    "kernel-0:5.14.0-427.152.1.el9_4",
    "kernel-rt-0:5.14.0-284.194.1.rt14.479.el9_2",
    "kernel-0:5.14.0-570.143.1.el9_6",
    "kernel-0:6.12.0-231.20.el10nv",
    "kernel-0:5.14.0-284.194.1.el9_2",
    "kernel-0:2.6.32-754.64.1.el6"
  ],
  "bugzilla": "2485368",
  "bugzilla_description": "kernel: netfilter: ebtables SNAT target writes to shared memory pages during ARP hardware address rewrite",
  "cvss3_score": "7.5",
  "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2026-06-01T12:00:00Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-53266.json",
  "severity": "important"
}

—

Product

product

different words

CISA Known Exploited Vulnerabilities

Kernel

receipt

Source: CISA Known Exploited Vulnerabilities
Its words: Kernel
Read by: field:product
Said since: 2026-09-28 11:44 UTC
Last answered: 2026-10-06 16:31 UTC

What the source handed over

{
  "cveID": "CVE-2026-53266",
  "cwes": "CWE-787",
  "dateAdded": "2026-09-18",
  "dueDate": "2026-09-21",
  "forensicTriage": "Yes",
  "knownRansomwareCampaignUse": "Unknown",
  "notes": "This vulnerability affects an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: ; https://git.kernel.org/stable/c/bf84ad7c7a9ede46e31afaa41a1ba06a159e8c87; https://git.kernel.org/stable/c/76280b78cc9f23bdc6438e10ad6dff148ef8375b; https://git.kernel.org/stable/c/b7e91939ba9be805a62a257fa4e227dffbb88fa0; https://git.kernel.org/stable/c/afd64b59c3de9bbbdd3759e834fdc55cda716e0b; https://git.kernel.org/stable/c/153ea96c806aea395daba907a4f88480b6ad5093; https://git.kernel.org/stable/c/b18675263db1147c8e1cab625400c13a0d87bd2d; https://git.kernel.org/stable/c/c9b5ff59feffb92a147a84a5aa28acd2cb8ff4c5; https://git.kernel.org/stable/c/67ba971ae02514d85818fe0c32549ab4bfa3bf49 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-53266",
  "product": "Kernel",
  "requiredAction": "Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.",
  "shortDescription": "Linux Kernel contains an out-of-bounds write vulnerability in the ebtables SNAT target which allows an ARP sender hardware address rewrite to write directly into a nonlinear socket-buffer fragment backed by a splice-imported file page. The impacted product(s) could be end-of-life (EoL) and/or end-of-service (EoS). Users are advised to discontinue use and/or transition to a supported version.",
  "vendorProject": "Linux",
  "vulnerabilityName": "Linux Kernel Out-of-Bounds Write Vulnerability"
}

—

Product

product

different words

NVD

Linux

receipt

Source: NVD
Its words: Linux
Read by: field:cve.affected[].affectedData[].product
Said since: 2026-09-29 17:49 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-09-29 17:49 UTC	Linux
2026-09-29 09:45 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "Linux",
            "programFiles": [
              "net/bridge/netfilter/ebt_snat.c"
            ],
            "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
            "vendor": "Linux",
            "versions": [
              {
                "lessThan": "bf84ad7c7a9ede46e31afaa41a1ba06a159e8c87",
                "status": "affected",
                "version": "63137bc5882a1882c553d389fdeeeace86ee1741",
                "versionType": "git"
              },
              {
                "lessThan": "76280b78cc9f23bdc6438e10ad6dff148ef8375b",
                "status": "affected",
                "version": "63137bc5882a1882c553d389fdeeeace86ee1741",
                "versionType": "git"
              },
              {
                "lessThan": "b7e91939ba9be805a62a257fa4e227dffbb88fa0",
                "status": "affected",
                "version": "63137bc5882a1882c553d389fdeeeace86ee1741",
                "versionType": "git"
              },
              {
                "lessThan": "afd64b59c3de9bbbdd3759e834fdc55cda716e0b",
                "status": "affected",
                "version": "63137bc5882a1882c553d389fdeeeace86ee1741",
                "versionType": "git"
              },
              {
                "lessThan": "153ea96c806aea395daba907a4f88480b6ad5093",
                "status": "affected",
                "version": "63137bc5882a1882c553d389fdeeeace86ee1741",
                "versionType": "git"
              },
              {
                "lessThan": "b18675263db1147c8e1cab625400c13a0d87bd2d",
                "status": "affected",
                "version": "63137bc5882a1882c553d389fdeeeace86ee1741",
                "versionType": "git"
              },
              {
                "lessThan": "c9b5ff59feffb92a147a84a5aa28acd2cb8ff4c5",
                "status": "affected",
                "version": "63137bc5882a1882c553d389fdeeeace86ee1741",
                "versionType": "git"
              },
              {
                "lessThan": "67ba971ae02514d85818fe0c32549ab4bfa3bf49",
                "status": "affected",
                "version": "63137bc5882a1882c553d389fdeeeace86ee1741",
                "versionType": "git"
              },
              {
                "status": "affected",
                "version": "2f3839075a5f8dcf116c1abe35b36b018ac62445",
                "versionType": "git"
              },
              {
                "status": "affected",
                "version": "51ba2945a8ef65ae437c8f9ba05f0343aa82ae5b",
                "versionType": "git"
              },
              {
                "status": "affected",
                "version": "b7d23c2c87584eb429f115c078ed511be8b18e29",
                "versionType": "git"
              },
              {
                "lessThan": "5.5",
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    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: bridge: make ebt_snat ARP rewrite writable\n\nThe ebtables SNAT target keeps the Ethernet source address rewrite\nbehind skb_ensure_writable(skb, 0).  This is intentional: at the bridge\nebtables hooks the Ethernet header is addressed through\nskb_mac_header()/eth_hdr(), while skb->data points at the Ethernet\npayload.  Asking skb_ensure_writable() for ETH_HLEN bytes would check\nthe payload, not the Ethernet header, and would reintroduce the small\npacket regression fixed by commit 63137bc5882a.\n\nHowever, the optional ARP sender hardware address rewrite is different.\nIt writes through skb_store_bits() at an offset relative to skb->data:\n\n        skb_store_bits(skb, sizeof(struct arphdr), info->mac, ETH_ALEN)\n\nskb_header_pointer() only safely reads the ARP header; it does not make\nthe later sender hardware address range writable.  If that range is\nstill held in a nonlinear skb fragment backed by a splice-imported file\npage, skb_store_bits() maps the frag page and copies the new MAC address\ndirectly into it.\n\nEnsure the ARP SHA range is writable before reading the ARP header and\nbefore calling skb_store_bits()."
      }
    ],
    "id": "CVE-2026-53266",
    "lastModified": "2026-09-19T04:17:53.580",
    "metrics": {
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          "cvssData": {
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            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
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            "role": "CISA Coordinator",
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        "tags": [
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    "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "vulnStatus": "Analyzed",
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            "lang": "en",
            "value": "NVD-CWE-noinfo"
          }
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        "source": "nvd@nist.gov",
        "type": "Primary"
      },
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-787"
          }
        ],
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  }
}

—

Severity

severity

NVD

HIGH

From 7.0 to 8.9.

receipt

Source: NVD
Its words: HIGH
Read by: field:cve.metrics.cvssMetricV31[type=Primary].cvssData.baseSeverity || field:cve.metrics.cvssMetricV31[].cvssData.baseSeverity
Said since: 2026-10-06 12:29 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:29 UTC	HIGH
2026-09-29 09:45 UTC	—

What the source handed over

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                "matchCriteriaId": "0D38F0BF-A728-4133-A358-D44A2F7EE6D6",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*",
                "matchCriteriaId": "EC732D08-5F7B-46D9-B154-E60C7F4F0A97",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:*",
                "matchCriteriaId": "E5910A9D-F60A-409A-B486-FE66BFEBA9B9",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:*",
                "matchCriteriaId": "81DFF19E-9CF8-49C6-8C36-1E4038622933",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc6:*:*:*:*:*:*",
                "matchCriteriaId": "B0E8FC71-3952-444C-83E9-718DBBBEC615",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: bridge: make ebt_snat ARP rewrite writable\n\nThe ebtables SNAT target keeps the Ethernet source address rewrite\nbehind skb_ensure_writable(skb, 0).  This is intentional: at the bridge\nebtables hooks the Ethernet header is addressed through\nskb_mac_header()/eth_hdr(), while skb->data points at the Ethernet\npayload.  Asking skb_ensure_writable() for ETH_HLEN bytes would check\nthe payload, not the Ethernet header, and would reintroduce the small\npacket regression fixed by commit 63137bc5882a.\n\nHowever, the optional ARP sender hardware address rewrite is different.\nIt writes through skb_store_bits() at an offset relative to skb->data:\n\n        skb_store_bits(skb, sizeof(struct arphdr), info->mac, ETH_ALEN)\n\nskb_header_pointer() only safely reads the ARP header; it does not make\nthe later sender hardware address range writable.  If that range is\nstill held in a nonlinear skb fragment backed by a splice-imported file\npage, skb_store_bits() maps the frag page and copies the new MAC address\ndirectly into it.\n\nEnsure the ARP SHA range is writable before reading the ARP header and\nbefore calling skb_store_bits()."
      }
    ],
    "id": "CVE-2026-53266",
    "lastModified": "2026-09-19T04:17:53.580",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.0,
          "impactScore": 6.0,
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
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            "options": [
              {
                "exploitation": "active"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "total"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-18T00:00:00+00:00",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-06-25T09:16:44.643",
    "references": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
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      },
      {
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        "tags": [
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      },
      {
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      },
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "tags": [
          "US Government Resource"
        ],
        "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-53266"
      }
    ],
    "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "NVD-CWE-noinfo"
          }
        ],
        "source": "nvd@nist.gov",
        "type": "Primary"
      },
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-787"
          }
        ],
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  }
}

high

Severity

severity

Red Hat

important

A flaw that can easily compromise confidentiality, integrity or availability.

receipt

Source: Red Hat
Its words: important
Read by: field:severity
Said since: 2026-09-29 09:44 UTC
Last answered: 2026-10-06 13:02 UTC
Original: open at the source

What the source handed over

{
  "CVE": "CVE-2026-53266",
  "CWE": "CWE-825",
  "advisories": [
    "RHSA-2026:73732",
    "RHSA-2026:71233",
    "RHSA-2026:71687",
    "RHSA-2026:72059",
    "RHSA-2026:71565",
    "RHSA-2026:71326",
    "RHSA-2026:71601",
    "RHSA-2026:70797",
    "RHSA-2026:71325",
    "RHSA-2026:71657",
    "RHSA-2026:36645",
    "RHSA-2026:71569",
    "RHSA-2026:71327",
    "RHSA-2026:71606",
    "RHSA-2026:39082",
    "RHSA-2026:39083"
  ],
  "affected_packages": [
    "kernel-rt-0:3.10.0-1160.164.1.rt56.1316.el7",
    "kernel-0:6.12.0-211.59.1.el10_2",
    "kernel-0:4.18.0-477.169.1.el8_8",
    "kernel-0:4.18.0-305.209.1.el8_4",
    "kernel-0:4.18.0-372.217.1.el8_6",
    "kernel-0:4.18.0-553.143.1.el8_10",
    "kernel-rt-0:4.18.0-553.143.1.rt7.484.el8_10",
    "kernel-0:6.12.0-55.106.1.el10_0",
    "kernel-0:5.14.0-687.23.1.el9_8",
    "kernel-0:3.10.0-1160.164.1.el7",
    "kernel-0:5.14.0-427.152.1.el9_4",
    "kernel-rt-0:5.14.0-284.194.1.rt14.479.el9_2",
    "kernel-0:5.14.0-570.143.1.el9_6",
    "kernel-0:6.12.0-231.20.el10nv",
    "kernel-0:5.14.0-284.194.1.el9_2",
    "kernel-0:2.6.32-754.64.1.el6"
  ],
  "bugzilla": "2485368",
  "bugzilla_description": "kernel: netfilter: ebtables SNAT target writes to shared memory pages during ARP hardware address rewrite",
  "cvss3_score": "7.5",
  "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2026-06-01T12:00:00Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-53266.json",
  "severity": "important"
}

high

Status

status

NVD

Analyzed

receipt

Source: NVD
Its words: Analyzed
Read by: field:cve.vulnStatus
Said since: 2026-09-29 09:45 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

What the source handed over

{
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                "status": "affected",
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                "versionType": "semver"
              },
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              },
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            "product": "Linux",
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            ],
            "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
            "vendor": "Linux",
            "versions": [
              {
                "status": "affected",
                "version": "5.10"
              },
              {
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                "status": "unaffected",
                "version": "0",
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              },
              {
                "lessThanOrEqual": "5.10.*",
                "status": "unaffected",
                "version": "5.10.259",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "5.15.*",
                "status": "unaffected",
                "version": "5.15.210",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.1.*",
                "status": "unaffected",
                "version": "6.1.176",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.6.*",
                "status": "unaffected",
                "version": "6.6.143",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.12.*",
                "status": "unaffected",
                "version": "6.12.94",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.18.*",
                "status": "unaffected",
                "version": "6.18.36",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "7.0.*",
                "status": "unaffected",
                "version": "7.0.13",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "7.1",
                "versionType": "original_commit_for_fix"
              }
            ]
          }
        ],
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
      }
    ],
    "cisaActionDue": "2026-09-21",
    "cisaExploitAdd": "2026-09-18",
    "cisaRequiredAction": "Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.",
    "cisaVulnerabilityName": "Linux Kernel Out-of-Bounds Write Vulnerability",
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
              {
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                "matchCriteriaId": "886AB560-B760-44F0-AD89-3F275E4C0F58",
                "versionEndExcluding": "5.5",
                "versionStartIncluding": "5.4.73",
                "vulnerable": true
              },
              {
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                "matchCriteriaId": "BEFC3ACE-365D-48E7-9C0A-019C74CC0725",
                "versionEndExcluding": "5.9",
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                "matchCriteriaId": "B1EF7059-E670-45F4-B422-54C40FA86390",
                "vulnerable": true
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                "matchCriteriaId": "0D38F0BF-A728-4133-A358-D44A2F7EE6D6",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*",
                "matchCriteriaId": "EC732D08-5F7B-46D9-B154-E60C7F4F0A97",
                "vulnerable": true
              },
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                "matchCriteriaId": "E5910A9D-F60A-409A-B486-FE66BFEBA9B9",
                "vulnerable": true
              },
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                "vulnerable": true
              },
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                "matchCriteriaId": "B0E8FC71-3952-444C-83E9-718DBBBEC615",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: bridge: make ebt_snat ARP rewrite writable\n\nThe ebtables SNAT target keeps the Ethernet source address rewrite\nbehind skb_ensure_writable(skb, 0).  This is intentional: at the bridge\nebtables hooks the Ethernet header is addressed through\nskb_mac_header()/eth_hdr(), while skb->data points at the Ethernet\npayload.  Asking skb_ensure_writable() for ETH_HLEN bytes would check\nthe payload, not the Ethernet header, and would reintroduce the small\npacket regression fixed by commit 63137bc5882a.\n\nHowever, the optional ARP sender hardware address rewrite is different.\nIt writes through skb_store_bits() at an offset relative to skb->data:\n\n        skb_store_bits(skb, sizeof(struct arphdr), info->mac, ETH_ALEN)\n\nskb_header_pointer() only safely reads the ARP header; it does not make\nthe later sender hardware address range writable.  If that range is\nstill held in a nonlinear skb fragment backed by a splice-imported file\npage, skb_store_bits() maps the frag page and copies the new MAC address\ndirectly into it.\n\nEnsure the ARP SHA range is writable before reading the ARP header and\nbefore calling skb_store_bits()."
      }
    ],
    "id": "CVE-2026-53266",
    "lastModified": "2026-09-19T04:17:53.580",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.0,
          "impactScore": 6.0,
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-53266",
            "options": [
              {
                "exploitation": "active"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "total"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-18T00:00:00+00:00",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-06-25T09:16:44.643",
    "references": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/153ea96c806aea395daba907a4f88480b6ad5093"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/67ba971ae02514d85818fe0c32549ab4bfa3bf49"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/76280b78cc9f23bdc6438e10ad6dff148ef8375b"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/afd64b59c3de9bbbdd3759e834fdc55cda716e0b"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/b18675263db1147c8e1cab625400c13a0d87bd2d"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/b7e91939ba9be805a62a257fa4e227dffbb88fa0"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/bf84ad7c7a9ede46e31afaa41a1ba06a159e8c87"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/c9b5ff59feffb92a147a84a5aa28acd2cb8ff4c5"
      },
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "tags": [
          "US Government Resource"
        ],
        "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-53266"
      }
    ],
    "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "NVD-CWE-noinfo"
          }
        ],
        "source": "nvd@nist.gov",
        "type": "Primary"
      },
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-787"
          }
        ],
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  }
}

—

Technical impact

technical_impact

NVD

total

The attacker gains full control of the component, or all of its information.

receipt

Source: NVD
Its words: total
Read by: field:cve.metrics.ssvcV203[].ssvcData.options[].technicalImpact
Said since: 2026-10-06 12:29 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:29 UTC	total
2026-09-29 09:45 UTC	—

What the source handed over

{
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                "status": "affected",
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                "status": "affected",
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                "status": "affected",
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                "status": "affected",
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            ]
          },
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            ],
            "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
            "vendor": "Linux",
            "versions": [
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                "status": "affected",
                "version": "5.10"
              },
              {
                "lessThan": "5.10",
                "status": "unaffected",
                "version": "0",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "5.10.*",
                "status": "unaffected",
                "version": "5.10.259",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "5.15.*",
                "status": "unaffected",
                "version": "5.15.210",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.1.*",
                "status": "unaffected",
                "version": "6.1.176",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.6.*",
                "status": "unaffected",
                "version": "6.6.143",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.12.*",
                "status": "unaffected",
                "version": "6.12.94",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.18.*",
                "status": "unaffected",
                "version": "6.18.36",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "7.0.*",
                "status": "unaffected",
                "version": "7.0.13",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "7.1",
                "versionType": "original_commit_for_fix"
              }
            ]
          }
        ],
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
      }
    ],
    "cisaActionDue": "2026-09-21",
    "cisaExploitAdd": "2026-09-18",
    "cisaRequiredAction": "Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.",
    "cisaVulnerabilityName": "Linux Kernel Out-of-Bounds Write Vulnerability",
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "886AB560-B760-44F0-AD89-3F275E4C0F58",
                "versionEndExcluding": "5.5",
                "versionStartIncluding": "5.4.73",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "BEFC3ACE-365D-48E7-9C0A-019C74CC0725",
                "versionEndExcluding": "5.9",
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                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "992FFB71-217E-40A6-B8BD-5AA742898F28",
                "versionEndExcluding": "5.10.259",
                "versionStartIncluding": "5.9.2",
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              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "5E938CDF-D1C4-43D0-98DC-9E11B6B55801",
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                "versionStartIncluding": "5.11",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "C4446623-5F2B-4DD8-8666-9FAAC285A757",
                "versionEndExcluding": "6.1.176",
                "versionStartIncluding": "5.16",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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              },
              {
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                "versionStartIncluding": "6.7",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "389025D2-958D-41BD-BD96-70ED1033A9F3",
                "versionEndExcluding": "6.18.36",
                "versionStartIncluding": "6.13",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "6A64BF9F-3BCA-42FD-98CB-8F03474D2B1E",
                "versionEndExcluding": "7.0.13",
                "versionStartIncluding": "6.19",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*",
                "matchCriteriaId": "B1EF7059-E670-45F4-B422-54C40FA86390",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*",
                "matchCriteriaId": "0D38F0BF-A728-4133-A358-D44A2F7EE6D6",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*",
                "matchCriteriaId": "EC732D08-5F7B-46D9-B154-E60C7F4F0A97",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:*",
                "matchCriteriaId": "E5910A9D-F60A-409A-B486-FE66BFEBA9B9",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:*",
                "matchCriteriaId": "81DFF19E-9CF8-49C6-8C36-1E4038622933",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc6:*:*:*:*:*:*",
                "matchCriteriaId": "B0E8FC71-3952-444C-83E9-718DBBBEC615",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: bridge: make ebt_snat ARP rewrite writable\n\nThe ebtables SNAT target keeps the Ethernet source address rewrite\nbehind skb_ensure_writable(skb, 0).  This is intentional: at the bridge\nebtables hooks the Ethernet header is addressed through\nskb_mac_header()/eth_hdr(), while skb->data points at the Ethernet\npayload.  Asking skb_ensure_writable() for ETH_HLEN bytes would check\nthe payload, not the Ethernet header, and would reintroduce the small\npacket regression fixed by commit 63137bc5882a.\n\nHowever, the optional ARP sender hardware address rewrite is different.\nIt writes through skb_store_bits() at an offset relative to skb->data:\n\n        skb_store_bits(skb, sizeof(struct arphdr), info->mac, ETH_ALEN)\n\nskb_header_pointer() only safely reads the ARP header; it does not make\nthe later sender hardware address range writable.  If that range is\nstill held in a nonlinear skb fragment backed by a splice-imported file\npage, skb_store_bits() maps the frag page and copies the new MAC address\ndirectly into it.\n\nEnsure the ARP SHA range is writable before reading the ARP header and\nbefore calling skb_store_bits()."
      }
    ],
    "id": "CVE-2026-53266",
    "lastModified": "2026-09-19T04:17:53.580",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.0,
          "impactScore": 6.0,
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-53266",
            "options": [
              {
                "exploitation": "active"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "total"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-18T00:00:00+00:00",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-06-25T09:16:44.643",
    "references": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/153ea96c806aea395daba907a4f88480b6ad5093"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/67ba971ae02514d85818fe0c32549ab4bfa3bf49"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/76280b78cc9f23bdc6438e10ad6dff148ef8375b"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/afd64b59c3de9bbbdd3759e834fdc55cda716e0b"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/b18675263db1147c8e1cab625400c13a0d87bd2d"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/b7e91939ba9be805a62a257fa4e227dffbb88fa0"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/bf84ad7c7a9ede46e31afaa41a1ba06a159e8c87"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/c9b5ff59feffb92a147a84a5aa28acd2cb8ff4c5"
      },
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "tags": [
          "US Government Resource"
        ],
        "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-53266"
      }
    ],
    "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "NVD-CWE-noinfo"
          }
        ],
        "source": "nvd@nist.gov",
        "type": "Primary"
      },
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-787"
          }
        ],
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  }
}

—

Vendor

vendor

CISA Known Exploited Vulnerabilities

Linux

receipt

Source: CISA Known Exploited Vulnerabilities
Last answered: 2026-10-06 16:31 UTC

What the source handed over

{
  "cveID": "CVE-2026-53266",
  "cwes": "CWE-787",
  "dateAdded": "2026-09-18",
  "dueDate": "2026-09-21",
  "forensicTriage": "Yes",
  "knownRansomwareCampaignUse": "Unknown",
  "notes": "This vulnerability affects an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: ; https://git.kernel.org/stable/c/bf84ad7c7a9ede46e31afaa41a1ba06a159e8c87; https://git.kernel.org/stable/c/76280b78cc9f23bdc6438e10ad6dff148ef8375b; https://git.kernel.org/stable/c/b7e91939ba9be805a62a257fa4e227dffbb88fa0; https://git.kernel.org/stable/c/afd64b59c3de9bbbdd3759e834fdc55cda716e0b; https://git.kernel.org/stable/c/153ea96c806aea395daba907a4f88480b6ad5093; https://git.kernel.org/stable/c/b18675263db1147c8e1cab625400c13a0d87bd2d; https://git.kernel.org/stable/c/c9b5ff59feffb92a147a84a5aa28acd2cb8ff4c5; https://git.kernel.org/stable/c/67ba971ae02514d85818fe0c32549ab4bfa3bf49 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-53266",
  "product": "Kernel",
  "requiredAction": "Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.",
  "shortDescription": "Linux Kernel contains an out-of-bounds write vulnerability in the ebtables SNAT target which allows an ARP sender hardware address rewrite to write directly into a nonlinear socket-buffer fragment backed by a splice-imported file page. The impacted product(s) could be end-of-life (EoL) and/or end-of-service (EoS). Users are advised to discontinue use and/or transition to a supported version.",
  "vendorProject": "Linux",
  "vulnerabilityName": "Linux Kernel Out-of-Bounds Write Vulnerability"
}

—

Vendor

vendor

NVD

Linux

receipt

Source: NVD
Its words: Linux
Read by: field:cve.affected[].affectedData[].vendor
Said since: 2026-09-29 17:49 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-09-29 17:49 UTC	Linux
2026-09-29 09:45 UTC	—

What the source handed over

{
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                "version": "0",
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                "version": "5.15.210",
                "versionType": "semver"
              },
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                "status": "unaffected",
                "version": "6.1.176",
                "versionType": "semver"
              },
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                "status": "unaffected",
                "version": "6.6.143",
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                "status": "unaffected",
                "version": "6.12.94",
                "versionType": "semver"
              },
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                "status": "unaffected",
                "version": "6.18.36",
                "versionType": "semver"
              },
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                "lessThanOrEqual": "7.0.*",
                "status": "unaffected",
                "version": "7.0.13",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "7.1",
                "versionType": "original_commit_for_fix"
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        ],
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
      }
    ],
    "cisaActionDue": "2026-09-21",
    "cisaExploitAdd": "2026-09-18",
    "cisaRequiredAction": "Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.",
    "cisaVulnerabilityName": "Linux Kernel Out-of-Bounds Write Vulnerability",
    "configurations": [
      {
        "nodes": [
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            "negate": false,
            "operator": "OR"
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        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: bridge: make ebt_snat ARP rewrite writable\n\nThe ebtables SNAT target keeps the Ethernet source address rewrite\nbehind skb_ensure_writable(skb, 0).  This is intentional: at the bridge\nebtables hooks the Ethernet header is addressed through\nskb_mac_header()/eth_hdr(), while skb->data points at the Ethernet\npayload.  Asking skb_ensure_writable() for ETH_HLEN bytes would check\nthe payload, not the Ethernet header, and would reintroduce the small\npacket regression fixed by commit 63137bc5882a.\n\nHowever, the optional ARP sender hardware address rewrite is different.\nIt writes through skb_store_bits() at an offset relative to skb->data:\n\n        skb_store_bits(skb, sizeof(struct arphdr), info->mac, ETH_ALEN)\n\nskb_header_pointer() only safely reads the ARP header; it does not make\nthe later sender hardware address range writable.  If that range is\nstill held in a nonlinear skb fragment backed by a splice-imported file\npage, skb_store_bits() maps the frag page and copies the new MAC address\ndirectly into it.\n\nEnsure the ARP SHA range is writable before reading the ARP header and\nbefore calling skb_store_bits()."
      }
    ],
    "id": "CVE-2026-53266",
    "lastModified": "2026-09-19T04:17:53.580",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
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          "impactScore": 6.0,
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "type": "Secondary"
        }
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          "ssvcData": {
            "id": "CVE-2026-53266",
            "options": [
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                "exploitation": "active"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "total"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-18T00:00:00+00:00",
            "version": "2.0.3"
          }
        }
      ]
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    "published": "2026-06-25T09:16:44.643",
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      {
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            "value": "CWE-787"
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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    ]
  }
}

—

Every claim, by kind

vulnerability

Linux Kernel Out-of-Bounds Write Vulnerability zetlyn/cve-kev · 2026-09-18	cwe CWE-787 cwes CWE-787 due_date 2026-09-21 exploited yes forensic_triage true known_ransomware_campaign_use Unknown product Kernel vendor Linux
kernel: netfilter: ebtables SNAT target writes to shared memory pages during ARP hardware address rewrite zetlyn/cve-redhat · 2026-06-01	cvss 7.5 cvss_vector CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H cwe CWE-825 packages kernel-rt-0:3.10.0-1160.164.1.rt56.1316.el7, kernel-0:6.12.0-211.59.1.el10_2, kernel-0:4.18.0-477.169.1.el8_8, kernel-0:4.18.0-305.209.1.el8_4, kernel-0:4.18.0-372.217.1.el8_6, kernel-0:4.18.0-553.143.1.el8_10, kernel-rt-0:4.18.0-553.143.1.rt7.484.el8_10, kernel-0:6.12.0-55.106.1.el10_0, kernel-0:5.14.0-687.23.1.el9_8, kernel-0:3.10.0-1160.164.1.el7, kernel-0:5.14.0-427.152.1.el9_4, kernel-rt-0:5.14.0-284.194.1.rt14.479.el9_2, kernel-0:5.14.0-570.143.1.el9_6, kernel-0:6.12.0-231.20.el10nv, kernel-0:5.14.0-284.194.1.el9_2, kernel-0:2.6.32-754.64.1.el6 severity important	source
Linux Kernel Out-of-Bounds Write Vulnerability zetlyn/cve-nvd · 2026-06-25	automatable no cvss 8.8 cvss_vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H cwe CWE-787 exploitation active fixed_in 5.5, 5.9, 5.10 product Linux severity HIGH status Analyzed technical_impact total vendor Linux	source