CVE-2026-80845 (GCVE-0-2026-80845)
Vulnerability from cvelistv5
Published
2026-09-04 15:54
Modified
2026-10-19 08:44
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: xfrm: avoid lock inversion in nat keepalive work nat_keepalive_work() walks the state table while xfrm_state_walk() holds net->xfrm.xfrm_state_lock. Its callback then acquires x->lock, which conflicts with the delete path taking the same locks in reverse order via xfrm_state_delete() and __xfrm_state_delete(). This creates an AB-BA deadlock that is reported by lockdep when a NAT keepalive worker races with SA deletion. Fix this by splitting the keepalive walk into two phases. First, collect the candidate states while the walk holds xfrm_state_lock and take a reference on each state. Then, after the walk completes, process each collected state and acquire x->lock without nesting it under xfrm_state_lock.
References
Impacted products
Vendor Product Version
Linux Linux Version: f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae
Version: f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae
Version: f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae
Version: f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae
Version: f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/xfrm/xfrm_nat_keepalive.c"
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          "vendor": "Linux",
          "versions": [
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              "version": "6.11"
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              "versionType": "semver"
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              "version": "7.2.3",
              "versionType": "semver"
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "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\nxfrm: avoid lock inversion in nat keepalive work\n\nnat_keepalive_work() walks the state table while xfrm_state_walk()\nholds net-\u003exfrm.xfrm_state_lock. Its callback then acquires x-\u003elock,\nwhich conflicts with the delete path taking the same locks in reverse\norder via xfrm_state_delete() and __xfrm_state_delete(). This creates\nan AB-BA deadlock that is reported by lockdep when a NAT keepalive\nworker races with SA deletion.\n\nFix this by splitting the keepalive walk into two phases. First,\ncollect the candidate states while the walk holds xfrm_state_lock and\ntake a reference on each state. Then, after the walk completes, process\neach collected state and acquire x-\u003elock without nesting it under\nxfrm_state_lock."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:44:39.455Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ea09210462316e5235a25eccb11ad0708d86615e"
        },
        {
          "url": "https://git.kernel.org/stable/c/5c86c895d1cac81a71ead3005084c6265cf6a7a5"
        },
        {
          "url": "https://git.kernel.org/stable/c/89ef3a2e1e4682ab82b0455ce113f8c39fb9e50d"
        },
        {
          "url": "https://git.kernel.org/stable/c/a9fa05b7a1246797748d15771052639e0d3cabf1"
        },
        {
          "url": "https://git.kernel.org/stable/c/763fe700b7c58ad64fe5202c5638848244dd4127"
        }
      ],
      "title": "xfrm: avoid lock inversion in nat keepalive work",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80845",
    "datePublished": "2026-09-04T15:54:55.489Z",
    "dateReserved": "2026-08-26T14:34:25.797Z",
    "dateUpdated": "2026-10-19T08:44:39.455Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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