In the Linux kernel, the following vulnerability has been resolved: ipv6: mcast: fix RCU list diversion in ip6_mc_del1_src() When removing a source filter whose count reaches zero, ip6_mc_del1_src() unlinks psf from pmc->mca_sources. If the filter was previously active, the code moved psf directly into pmc->mca_tomb by updating psf->sf_next. Because pmc->mca_sources is traversed locklessly under RCU (e.g. by ipv6_chk_mcast_addr()), mutating psf->sf_next before a grace period elapses diverts concurrent readers to the tombstone list. Consequently, readers miss remaining active sources in pmc->mca_sources and improperly examine deleted tombstone entries. Fix this by allocating a new tombstone node for pmc->mca_tomb (as done in sf_setstate()) and retiring the original psf via kfree_rcu().

cve CVE-2026-98102 2 sources, 3 claims · Watch

NVD writes:
In the Linux kernel, the following vulnerability has been resolved: ipv6: mcast: fix RCU list diversion in ip6_mc_del1_src() When removing a source filter whose count reaches zero, ip6_mc_del1_src() unlinks psf from pmc->mca_sources. If the filter was previously active, the code moved psf directly into pmc->mca_tomb by updating psf->sf_next. Because pmc->mca_sources is traversed locklessly under RCU (e.g. by ipv6_chk_mcast_addr()), mutating psf->sf_next before a grace period elapses diverts concurrent readers to the tombstone list. Consequently, readers miss remaining active sources in pmc-… the claim

What it is to other things

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

affectslinux/linux
NVD says “Linux · Linux”
made_bylinux
NVD says “Linux”

What each source says

PropertySourceSaidMeans here
Product
product
NVDLinux
receipt
Source
NVD
Its words
Linux
Read by
field:cve.affected[].affectedData[].product
Said since
2026-09-29 17:49 UTC
Last answered
2026-10-04 18:16 UTC
Original
open at the source
2026-09-29 17:49 UTCLinux
2026-09-29 09:45 UTC—
What the source handed over
{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "Linux",
            "programFiles": [
              "net/ipv6/mcast.c"
            ],
            "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
            "vendor": "Linux",
            "versions": [
              {
                "lessThan": "c3343cd7ec8706c221e52b782f386b9af14a928a",
                "status": "affected",
                "version": "4b200e398953c237c86d32bf26d4cb2a96556a6f",
                "versionType": "git"
              },
              {
                "lessThan": "4352737297b262e8367675c19a7dc6a9f53c97af",
                "status": "affected",
                "version": "4b200e398953c237c86d32bf26d4cb2a96556a6f",
                "versionType": "git"
              },
              {
                "lessThan": "8d4fe5c13f5056faa6deb09a90e24a89f9ebfad4",
                "status": "affected",
                "version": "4b200e398953c237c86d32bf26d4cb2a96556a6f",
                "versionType": "git"
              },
              {
                "lessThan": "5149c60c406595b56fda0c6e9aae7fd287f636aa",
                "status": "affected",
                "version": "4b200e398953c237c86d32bf26d4cb2a96556a6f",
                "versionType": "git"
              },
              {
                "lessThan": "93b49239840b91313adbd77b8b52993eff2d08c1",
                "status": "affected",
                "version": "4b200e398953c237c86d32bf26d4cb2a96556a6f",
                "versionType": "git"
              },
              {
                "status": "affected",
                "version": "86c49119f0353f857cc08030ec9e4ebaab3d5a64",
                "versionType": "git"
              },
              {
                "lessThan": "5.11",
                "status": "affected",
                "version": "5.10.261",
                "versionType": "semver"
              }
            ]
          },
          {
            "defaultStatus": "affected",
            "product": "Linux",
            "programFiles": [
              "net/ipv6/mcast.c"
            ],
            "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
            "vendor": "Linux",
            "versions": [
              {
                "status": "affected",
                "version": "5.13"
              },
              {
                "lessThan": "5.13",
                "status": "unaffected",
                "version": "0",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.6.*",
                "status": "unaffected",
                "version": "6.6.158",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.12.*",
                "status": "unaffected",
                "version": "6.12.111",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.18.*",
                "status": "unaffected",
                "version": "6.18.53",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "7.2.*",
                "status": "unaffected",
                "version": "7.2.7",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "7.3-rc2",
                "versionType": "original_commit_for_fix"
              }
            ]
          }
        ],
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: mcast: fix RCU list diversion in ip6_mc_del1_src()\n\nWhen removing a source filter whose count reaches zero, ip6_mc_del1_src()\nunlinks psf from pmc->mca_sources. If the filter was previously active,\nthe code moved psf directly into pmc->mca_tomb by updating psf->sf_next.\n\nBecause pmc->mca_sources is traversed locklessly under RCU (e.g. by\nipv6_chk_mcast_addr()), mutating psf->sf_next before a grace period\nelapses diverts concurrent readers to the tombstone list. Consequently,\nreaders miss remaining active sources in pmc->mca_sources and improperly\nexamine deleted tombstone entries.\n\nFix this by allocating a new tombstone node for pmc->mca_tomb (as done\nin sf_setstate()) and retiring the original psf via kfree_rcu()."
      }
    ],
    "id": "CVE-2026-98102",
    "lastModified": "2026-10-03T11:18:32.423",
    "metrics": {},
    "published": "2026-09-25T11:17:39.943",
    "references": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/4352737297b262e8367675c19a7dc6a9f53c97af"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/5149c60c406595b56fda0c6e9aae7fd287f636aa"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/8d4fe5c13f5056faa6deb09a90e24a89f9ebfad4"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/93b49239840b91313adbd77b8b52993eff2d08c1"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/c3343cd7ec8706c221e52b782f386b9af14a928a"
      }
    ],
    "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "vulnStatus": "Undergoing Analysis"
  }
}
—
Severity
severity
GitHub advisoriesunknown
receipt
Source
GitHub advisories
Said since
2026-09-26 15:00 UTC
Last answered
2026-10-04 18:15 UTC
Original
open at the source

This source has not kept a receipt for this claim yet. The next update that reads it will.

—
Status
status
NVDUndergoing Analysis
receipt
Source
NVD
Its words
Undergoing Analysis
Read by
field:cve.vulnStatus
Said since
2026-10-03 12:09 UTC
Last answered
2026-10-04 18:16 UTC
Original
open at the source
2026-10-03 12:09 UTCUndergoing Analysis
2026-10-02 12:00 UTCAwaiting Analysis
2026-09-29 09:45 UTCReceived
What the source handed over
{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "Linux",
            "programFiles": [
              "net/ipv6/mcast.c"
            ],
            "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
            "vendor": "Linux",
            "versions": [
              {
                "lessThan": "c3343cd7ec8706c221e52b782f386b9af14a928a",
                "status": "affected",
                "version": "4b200e398953c237c86d32bf26d4cb2a96556a6f",
                "versionType": "git"
              },
              {
                "lessThan": "4352737297b262e8367675c19a7dc6a9f53c97af",
                "status": "affected",
                "version": "4b200e398953c237c86d32bf26d4cb2a96556a6f",
                "versionType": "git"
              },
              {
                "lessThan": "8d4fe5c13f5056faa6deb09a90e24a89f9ebfad4",
                "status": "affected",
                "version": "4b200e398953c237c86d32bf26d4cb2a96556a6f",
                "versionType": "git"
              },
              {
                "lessThan": "5149c60c406595b56fda0c6e9aae7fd287f636aa",
                "status": "affected",
                "version": "4b200e398953c237c86d32bf26d4cb2a96556a6f",
                "versionType": "git"
              },
              {
                "lessThan": "93b49239840b91313adbd77b8b52993eff2d08c1",
                "status": "affected",
                "version": "4b200e398953c237c86d32bf26d4cb2a96556a6f",
                "versionType": "git"
              },
              {
                "status": "affected",
                "version": "86c49119f0353f857cc08030ec9e4ebaab3d5a64",
                "versionType": "git"
              },
              {
                "lessThan": "5.11",
                "status": "affected",
                "version": "5.10.261",
                "versionType": "semver"
              }
            ]
          },
          {
            "defaultStatus": "affected",
            "product": "Linux",
            "programFiles": [
              "net/ipv6/mcast.c"
            ],
            "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
            "vendor": "Linux",
            "versions": [
              {
                "status": "affected",
                "version": "5.13"
              },
              {
                "lessThan": "5.13",
                "status": "unaffected",
                "version": "0",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.6.*",
                "status": "unaffected",
                "version": "6.6.158",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.12.*",
                "status": "unaffected",
                "version": "6.12.111",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.18.*",
                "status": "unaffected",
                "version": "6.18.53",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "7.2.*",
                "status": "unaffected",
                "version": "7.2.7",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "7.3-rc2",
                "versionType": "original_commit_for_fix"
              }
            ]
          }
        ],
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: mcast: fix RCU list diversion in ip6_mc_del1_src()\n\nWhen removing a source filter whose count reaches zero, ip6_mc_del1_src()\nunlinks psf from pmc->mca_sources. If the filter was previously active,\nthe code moved psf directly into pmc->mca_tomb by updating psf->sf_next.\n\nBecause pmc->mca_sources is traversed locklessly under RCU (e.g. by\nipv6_chk_mcast_addr()), mutating psf->sf_next before a grace period\nelapses diverts concurrent readers to the tombstone list. Consequently,\nreaders miss remaining active sources in pmc->mca_sources and improperly\nexamine deleted tombstone entries.\n\nFix this by allocating a new tombstone node for pmc->mca_tomb (as done\nin sf_setstate()) and retiring the original psf via kfree_rcu()."
      }
    ],
    "id": "CVE-2026-98102",
    "lastModified": "2026-10-03T11:18:32.423",
    "metrics": {},
    "published": "2026-09-25T11:17:39.943",
    "references": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/4352737297b262e8367675c19a7dc6a9f53c97af"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/5149c60c406595b56fda0c6e9aae7fd287f636aa"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/8d4fe5c13f5056faa6deb09a90e24a89f9ebfad4"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/93b49239840b91313adbd77b8b52993eff2d08c1"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/c3343cd7ec8706c221e52b782f386b9af14a928a"
      }
    ],
    "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "vulnStatus": "Undergoing Analysis"
  }
}
—
Vendor
vendor
NVDLinux
receipt
Source
NVD
Its words
Linux
Read by
field:cve.affected[].affectedData[].vendor
Said since
2026-09-29 17:49 UTC
Last answered
2026-10-04 18:16 UTC
Original
open at the source
2026-09-29 17:49 UTCLinux
2026-09-29 09:45 UTC—
What the source handed over
{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "Linux",
            "programFiles": [
              "net/ipv6/mcast.c"
            ],
            "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
            "vendor": "Linux",
            "versions": [
              {
                "lessThan": "c3343cd7ec8706c221e52b782f386b9af14a928a",
                "status": "affected",
                "version": "4b200e398953c237c86d32bf26d4cb2a96556a6f",
                "versionType": "git"
              },
              {
                "lessThan": "4352737297b262e8367675c19a7dc6a9f53c97af",
                "status": "affected",
                "version": "4b200e398953c237c86d32bf26d4cb2a96556a6f",
                "versionType": "git"
              },
              {
                "lessThan": "8d4fe5c13f5056faa6deb09a90e24a89f9ebfad4",
                "status": "affected",
                "version": "4b200e398953c237c86d32bf26d4cb2a96556a6f",
                "versionType": "git"
              },
              {
                "lessThan": "5149c60c406595b56fda0c6e9aae7fd287f636aa",
                "status": "affected",
                "version": "4b200e398953c237c86d32bf26d4cb2a96556a6f",
                "versionType": "git"
              },
              {
                "lessThan": "93b49239840b91313adbd77b8b52993eff2d08c1",
                "status": "affected",
                "version": "4b200e398953c237c86d32bf26d4cb2a96556a6f",
                "versionType": "git"
              },
              {
                "status": "affected",
                "version": "86c49119f0353f857cc08030ec9e4ebaab3d5a64",
                "versionType": "git"
              },
              {
                "lessThan": "5.11",
                "status": "affected",
                "version": "5.10.261",
                "versionType": "semver"
              }
            ]
          },
          {
            "defaultStatus": "affected",
            "product": "Linux",
            "programFiles": [
              "net/ipv6/mcast.c"
            ],
            "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
            "vendor": "Linux",
            "versions": [
              {
                "status": "affected",
                "version": "5.13"
              },
              {
                "lessThan": "5.13",
                "status": "unaffected",
                "version": "0",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.6.*",
                "status": "unaffected",
                "version": "6.6.158",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.12.*",
                "status": "unaffected",
                "version": "6.12.111",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.18.*",
                "status": "unaffected",
                "version": "6.18.53",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "7.2.*",
                "status": "unaffected",
                "version": "7.2.7",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "7.3-rc2",
                "versionType": "original_commit_for_fix"
              }
            ]
          }
        ],
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: mcast: fix RCU list diversion in ip6_mc_del1_src()\n\nWhen removing a source filter whose count reaches zero, ip6_mc_del1_src()\nunlinks psf from pmc->mca_sources. If the filter was previously active,\nthe code moved psf directly into pmc->mca_tomb by updating psf->sf_next.\n\nBecause pmc->mca_sources is traversed locklessly under RCU (e.g. by\nipv6_chk_mcast_addr()), mutating psf->sf_next before a grace period\nelapses diverts concurrent readers to the tombstone list. Consequently,\nreaders miss remaining active sources in pmc->mca_sources and improperly\nexamine deleted tombstone entries.\n\nFix this by allocating a new tombstone node for pmc->mca_tomb (as done\nin sf_setstate()) and retiring the original psf via kfree_rcu()."
      }
    ],
    "id": "CVE-2026-98102",
    "lastModified": "2026-10-03T11:18:32.423",
    "metrics": {},
    "published": "2026-09-25T11:17:39.943",
    "references": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/4352737297b262e8367675c19a7dc6a9f53c97af"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/5149c60c406595b56fda0c6e9aae7fd287f636aa"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/8d4fe5c13f5056faa6deb09a90e24a89f9ebfad4"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/93b49239840b91313adbd77b8b52993eff2d08c1"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/c3343cd7ec8706c221e52b782f386b9af14a928a"
      }
    ],
    "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "vulnStatus": "Undergoing Analysis"
  }
}
—

vulnerability

In the Linux kernel, the following vulnerability has been resolved: ipv6: mcast: fix RCU list diversion in ip6_mc_del1_src() When removing a source filter whose count reaches zero, ip6_mc_del1_src() unlinks psf from pmc->mca_sources. If the filter was previously active, the code moved psf directly into pmc->mca_tomb by updating psf->sf_next. Because pmc->mca_sources is traversed locklessly under RCU (e.g. by ipv6_chk_mcast_addr()), mutating psf->sf_next before a grace period elapses diverts concurrent readers to the tombstone list. Consequently, readers miss remaining active sources in pmc->mca_sources and improperly examine deleted tombstone entries. Fix this by allocating a new tombstone node for pmc->mca_tomb (as done in sf_setstate()) and retiring the original psf via kfree_rcu().
zetlyn/cve-nvd · 2026-09-25
product Linux status Undergoing Analysis vendor Linux source
In the Linux kernel, the following vulnerability has been resolved: ipv6: mcast: fix RCU list...
zetlyn/cve-ghsa · 2026-09-25
severity unknown source
In the Linux kernel, the following vulnerability has been resolved: ipv6: mcast: fix RCU list...
zetlyn/cve-ghsa · 2026-09-25
severity unknown source