FKIE_CVE-2026-80636

Vulnerability from fkie_nvd - Published: 2026-08-28 08:16 - Updated: 2026-08-28 08:16
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: conntrack: revert ct extension genid infrastructure This infrastructure is not used anymore after moving ct timeout and helper to use datapath refcount to track object use. Revert commit c56716c69ce1 ("netfilter: extensions: introduce extension genid count") this patch disables all ct extensions (leading to NULL) for unconfirmed conntracks, when this is only targeted at ct helper and ct timeout. There is also codebase that dereferences the ct extension without checking for NULL which could lead to crash.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/35e21a4dccc5c255ba59ccfbfeb4629ed21da972
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/61eab1d0237eb513fe73e391a5926ee70092c325
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6bba4846f196d081bf553391d12b5a73dcc48685
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a052a94bcc629acaecc2ce42a4af77f8fa399757
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d53eecbca16f056abba274075cb15120ab062518
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/net/netfilter/nf_conntrack_extend.h",
            "net/netfilter/nf_conntrack_core.c",
            "net/netfilter/nf_conntrack_extend.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6bba4846f196d081bf553391d12b5a73dcc48685",
              "status": "affected",
              "version": "c56716c69ce1ac320432fb1ea5654196ba24d2f8",
              "versionType": "git"
            },
            {
              "lessThan": "61eab1d0237eb513fe73e391a5926ee70092c325",
              "status": "affected",
              "version": "c56716c69ce1ac320432fb1ea5654196ba24d2f8",
              "versionType": "git"
            },
            {
              "lessThan": "d53eecbca16f056abba274075cb15120ab062518",
              "status": "affected",
              "version": "c56716c69ce1ac320432fb1ea5654196ba24d2f8",
              "versionType": "git"
            },
            {
              "lessThan": "a052a94bcc629acaecc2ce42a4af77f8fa399757",
              "status": "affected",
              "version": "c56716c69ce1ac320432fb1ea5654196ba24d2f8",
              "versionType": "git"
            },
            {
              "lessThan": "35e21a4dccc5c255ba59ccfbfeb4629ed21da972",
              "status": "affected",
              "version": "c56716c69ce1ac320432fb1ea5654196ba24d2f8",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "include/net/netfilter/nf_conntrack_extend.h",
            "net/netfilter/nf_conntrack_core.c",
            "net/netfilter/nf_conntrack_extend.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.19"
            },
            {
              "lessThan": "5.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "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\nnetfilter: conntrack: revert ct extension genid infrastructure\n\nThis infrastructure is not used anymore after moving ct timeout and\nhelper to use datapath refcount to track object use.\n\nRevert commit c56716c69ce1 (\"netfilter: extensions: introduce extension\ngenid count\") this patch disables all ct extensions (leading to NULL)\nfor unconfirmed conntracks, when this is only targeted at ct helper and\nct timeout. There is also codebase that dereferences the ct extension\nwithout checking for NULL which could lead to crash."
    }
  ],
  "id": "CVE-2026-80636",
  "lastModified": "2026-08-28T08:16:48.513",
  "metrics": {},
  "published": "2026-08-28T08:16:48.513",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/35e21a4dccc5c255ba59ccfbfeb4629ed21da972"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/61eab1d0237eb513fe73e391a5926ee70092c325"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6bba4846f196d081bf553391d12b5a73dcc48685"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a052a94bcc629acaecc2ce42a4af77f8fa399757"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d53eecbca16f056abba274075cb15120ab062518"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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