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CVE-2026-80845 (GCVE-0-2026-80845)

Vulnerability from cvelistv5 – Published: 2026-09-04 15:54 – Updated: 2026-09-04 15:54
VLAI
Title
xfrm: avoid lock inversion in nat keepalive work
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae , < ea09210462316e5235a25eccb11ad0708d86615e (git)
Affected: f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae , < 5c86c895d1cac81a71ead3005084c6265cf6a7a5 (git)
Affected: f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae , < 89ef3a2e1e4682ab82b0455ce113f8c39fb9e50d (git)
Affected: f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae , < a9fa05b7a1246797748d15771052639e0d3cabf1 (git)
Affected: f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae , < 763fe700b7c58ad64fe5202c5638848244dd4127 (git)
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Linux Linux Affected: 6.11
Unaffected: 0 , < 6.11 (semver)
Unaffected: 6.12.108 , ≤ 6.12.* (semver)
Unaffected: 6.18.49 , ≤ 6.18.* (semver)
Unaffected: 7.1.13 , ≤ 7.1.* (semver)
Unaffected: 7.2.3 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/xfrm/xfrm_nat_keepalive.c"
          ],
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          "vendor": "Linux",
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              "status": "unaffected",
              "version": "7.1.13",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.2.3",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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                },
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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": "2026-09-04T15:54:55.489Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/ea09210462316e5235a25eccb11ad0708d86615e"
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          "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": "2026-09-04T15:54:55.489Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-80845",
      "date": "2026-09-14",
      "epss": "0.00168",
      "percentile": "0.0639"
    },
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    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-10T01:50:43Z",
      "cve": "CVE-2026-80845",
      "id": "CVE-2026-80845",
      "initial_release_date": "2026-09-05T00:26:20Z",
      "product_status:known_affected": "17",
      "product_status:known_not_affected": "324",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80845",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80845.json",
      "version": "4"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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