gfs2-utils: gfs2-utils: stack overflow via alloca(1<<di_depth) in hash table traversal

cve CVE-2026-71219 2 sources, 2 claims · Watch

Red Hat writes:
gfs2-utils: gfs2-utils: stack overflow via alloca(1<<di_depth) in hash table traversal the claim

Severity: MEDIUM NVD
moderate Red Hat
CVSS: 4.7 NVD
4.7 Red Hat
Vendor: Red Hat NVD
Product: Red Hat Enterprise Linux 7 NVD
CWE: CWE-770 NVD
CWE-770 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
Used in ransomware campaigns

Timeline

2026-09-03	first spoke of it: A stack overflow vulnerability was found in gfs2-utils. The hash table traversal code in metawalk.c uses alloca() with an exponentially-derived size from the untrusted on-disk di_depth field without bounds validation. A crafted GFS2 filesystem image with a large di_depth value causes stack exhaustion and a denial of service when processed by fsck.gfs2, gfs2_edit, or savemeta.	NVD
2026-09-03	first spoke of it: gfs2-utils: gfs2-utils: stack overflow via alloca(1<<di_depth) in hash table traversal	Red Hat

What it is to other things

affects	redhat/enterprise_linux NVD
made_by	redhat NVD

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

made_by	`red_hat` NVD says “Red Hat”
affects	`red_hat/red_hat_enterprise_linux_7` NVD says “Red Hat · Red Hat Enterprise Linux 7”

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 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	no
2026-09-29 09:45 UTC	—

What the source handed over

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            "packageName": "gfs2-utils",
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            "packageName": "gfs2-utils",
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}

—

CVSS

cvss

NVD

4.7

receipt

Source: NVD
Its words: 4.7
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

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  "cve": {
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            "packageName": "gfs2-utils",
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}

—

CVSS

cvss

Red Hat

4.7

receipt

Source: Red Hat
Its words: 4.7
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

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  "CWE": "CWE-770",
  "advisories": [],
  "affected_packages": [],
  "bugzilla": "2507750",
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  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2026-09-03T11:40:42Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-71219.json",
  "severity": "moderate"
}

—

CVSS vector

cvss_vector

NVD

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

receipt

Source: NVD
Its words: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
Read by: field:cve.metrics.cvssMetricV31[type=Primary].cvssData.vectorString || field:cve.metrics.cvssMetricV31[].cvssData.vectorString
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
2026-09-29 09:45 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
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            "packageName": "gfs2-utils",
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          },
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}

—

CVSS vector

cvss_vector

Red Hat

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

receipt

Source: Red Hat
Its words: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/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:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
2026-09-29 09:44 UTC	—

What the source handed over

{
  "CVE": "CVE-2026-71219",
  "CWE": "CWE-770",
  "advisories": [],
  "affected_packages": [],
  "bugzilla": "2507750",
  "bugzilla_description": "gfs2-utils: gfs2-utils: stack overflow via alloca(1<<di_depth) in hash table traversal",
  "cvss3_score": "4.7",
  "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2026-09-03T11:40:42Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-71219.json",
  "severity": "moderate"
}

—

CWE

cwe

NVD

CWE-770

receipt

Source: NVD
Its words: CWE-770
Read by: field:cve.weaknesses[].description[].value
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	CWE-770
2026-09-29 09:45 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
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            ],
            "defaultStatus": "affected",
            "packageName": "gfs2-utils",
            "product": "Red Hat Enterprise Linux 7",
            "vendor": "Red Hat"
          },
          {
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            "defaultStatus": "affected",
            "packageName": "gfs2-utils",
            "product": "Red Hat Enterprise Linux 8",
            "vendor": "Red Hat"
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  }
}

—

CWE

cwe

Red Hat

CWE-770

receipt

Source: Red Hat
Its words: CWE-770
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

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  "CWE": "CWE-770",
  "advisories": [],
  "affected_packages": [],
  "bugzilla": "2507750",
  "bugzilla_description": "gfs2-utils: gfs2-utils: stack overflow via alloca(1<<di_depth) in hash table traversal",
  "cvss3_score": "4.7",
  "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2026-09-03T11:40:42Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-71219.json",
  "severity": "moderate"
}

—

Exploitation

exploitation

NVD

none

No evidence of exploitation, and no public proof of concept.

receipt

Source: NVD
Its words: none
Read by: field:cve.metrics.ssvcV203[].ssvcData.options[].exploitation
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	none
2026-09-29 09:45 UTC	—

What the source handed over

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}

—

Product

product

NVD

Red Hat Enterprise Linux 7

receipt

Source: NVD
Its words: Red Hat Enterprise Linux 7
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	Red Hat Enterprise Linux 7
2026-09-29 09:45 UTC	—

What the source handed over

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}

—

Severity

severity

NVD

MEDIUM

From 4.0 to 6.9.

receipt

Source: NVD
Its words: MEDIUM
Read by: field:cve.metrics.cvssMetricV31[type=Primary].cvssData.baseSeverity || field:cve.metrics.cvssMetricV31[].cvssData.baseSeverity
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	MEDIUM
2026-09-29 09:45 UTC	—

What the source handed over

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          "Issue Tracking",
          "Vendor Advisory"
        ],
        "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507750"
      }
    ],
    "sourceIdentifier": "secalert@redhat.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
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        ],
        "source": "secalert@redhat.com",
        "type": "Secondary"
      }
    ]
  }
}

medium

Severity

severity

Red Hat

moderate

A flaw that is harder to exploit, or whose impact is limited.

receipt

Source: Red Hat
Its words: moderate
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

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  "CWE": "CWE-770",
  "advisories": [],
  "affected_packages": [],
  "bugzilla": "2507750",
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  "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2026-09-03T11:40:42Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-71219.json",
  "severity": "moderate"
}

medium

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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    ]
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}

—

Technical impact

technical_impact

NVD

partial

The attacker gains limited control, or limited information.

receipt

Source: NVD
Its words: partial
Read by: field:cve.metrics.ssvcV203[].ssvcData.options[].technicalImpact
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	partial
2026-09-29 09:45 UTC	—

What the source handed over

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      {
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            "packageName": "gfs2-utils",
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            "vendor": "Red Hat"
          },
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            "defaultStatus": "affected",
            "packageName": "gfs2-utils",
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            "vendor": "Red Hat"
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          },
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    ],
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        "type": "Secondary"
      }
    ]
  }
}

—

Vendor

vendor

NVD

Red Hat

receipt

Source: NVD
Its words: Red Hat
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	Red Hat
2026-09-29 09:45 UTC	—

What the source handed over

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  "cve": {
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      {
        "affectedData": [
          {
            "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
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            "packageName": "gfs2-utils",
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            "vendor": "Red Hat"
          },
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            ],
            "defaultStatus": "affected",
            "packageName": "gfs2-utils",
            "product": "Red Hat Enterprise Linux 8",
            "vendor": "Red Hat"
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        "type": "Secondary"
      }
    ]
  }
}

—

Every claim, by kind

vulnerability

gfs2-utils: gfs2-utils: stack overflow via alloca(1<<di_depth) in hash table traversal zetlyn/cve-redhat · 2026-09-03	cvss 4.7 cvss_vector CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H cwe CWE-770 severity moderate	source
A stack overflow vulnerability was found in gfs2-utils. The hash table traversal code in metawalk.c uses alloca() with an exponentially-derived size from the untrusted on-disk di_depth field without bounds validation. A crafted GFS2 filesystem image with a large di_depth value causes stack exhaustion and a denial of service when processed by fsck.gfs2, gfs2_edit, or savemeta. zetlyn/cve-nvd · 2026-09-03	automatable no cvss 4.7 cvss_vector CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H cwe CWE-770 exploitation none product Red Hat Enterprise Linux 7 severity MEDIUM status Analyzed technical_impact partial vendor Red Hat	source