CVE-2026-80636 (GCVE-0-2026-80636)
Vulnerability from cvelistv5
Published
2026-08-28 06:48
Modified
2026-08-28 06:48
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
Impacted products
Vendor Product Version
Linux Linux Version: c56716c69ce1ac320432fb1ea5654196ba24d2f8
Version: c56716c69ce1ac320432fb1ea5654196ba24d2f8
Version: c56716c69ce1ac320432fb1ea5654196ba24d2f8
Version: c56716c69ce1ac320432fb1ea5654196ba24d2f8
Version: c56716c69ce1ac320432fb1ea5654196ba24d2f8
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/net/netfilter/nf_conntrack_extend.h",
            "net/netfilter/nf_conntrack_core.c",
            "net/netfilter/nf_conntrack_extend.c"
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          "programFiles": [
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            "net/netfilter/nf_conntrack_core.c",
            "net/netfilter/nf_conntrack_extend.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "7.1.5",
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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              "negate": false,
              "operator": "OR"
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      ],
      "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-28T06:48:50.241Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/6bba4846f196d081bf553391d12b5a73dcc48685"
        },
        {
          "url": "https://git.kernel.org/stable/c/61eab1d0237eb513fe73e391a5926ee70092c325"
        },
        {
          "url": "https://git.kernel.org/stable/c/d53eecbca16f056abba274075cb15120ab062518"
        },
        {
          "url": "https://git.kernel.org/stable/c/a052a94bcc629acaecc2ce42a4af77f8fa399757"
        },
        {
          "url": "https://git.kernel.org/stable/c/35e21a4dccc5c255ba59ccfbfeb4629ed21da972"
        }
      ],
      "title": "netfilter: conntrack: revert ct extension genid infrastructure",
      "x_generator": {
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      }
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80636",
    "datePublished": "2026-08-28T06:48:50.241Z",
    "dateReserved": "2026-08-26T14:34:25.777Z",
    "dateUpdated": "2026-08-28T06:48:50.241Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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