{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae"
            },
            {
              "fixed": "ea09210462316e5235a25eccb11ad0708d86615e"
            },
            {
              "fixed": "5c86c895d1cac81a71ead3005084c6265cf6a7a5"
            },
            {
              "fixed": "89ef3a2e1e4682ab82b0455ce113f8c39fb9e50d"
            },
            {
              "fixed": "a9fa05b7a1246797748d15771052639e0d3cabf1"
            },
            {
              "fixed": "763fe700b7c58ad64fe5202c5638848244dd4127"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.11.0"
            },
            {
              "fixed": "6.12.108"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.49"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.13"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "7.2.0"
            },
            {
              "fixed": "7.2.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80845.json"
  },
  "details": "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.",
  "id": "CVE-2026-80845",
  "modified": "2026-09-06T03:30:50.791626969Z",
  "published": "2026-09-04T15:54:55.489Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5c86c895d1cac81a71ead3005084c6265cf6a7a5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/763fe700b7c58ad64fe5202c5638848244dd4127"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/89ef3a2e1e4682ab82b0455ce113f8c39fb9e50d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a9fa05b7a1246797748d15771052639e0d3cabf1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ea09210462316e5235a25eccb11ad0708d86615e"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80845.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80845"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "xfrm: avoid lock inversion in nat keepalive work"
}