{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "880a6fab8f6ba5b5abe59ea68533202ddea1012c"
            },
            {
              "fixed": "56ea2257b83ee29a543f158159e3d1abc1e3e4fe"
            },
            {
              "fixed": "8854e9367465d784046362698731c1111e3b39b8"
            },
            {
              "fixed": "4e2e77843fef473ef47e322d52436d8308582a96"
            },
            {
              "fixed": "29fe3a61bcdce398ee3955101c39f89c01a8a77e"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.18.0"
            },
            {
              "fixed": "6.12.80"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.21"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.11"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31516.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: prevent policy_hthresh.work from racing with netns teardown\n\nA XFRM_MSG_NEWSPDINFO request can queue the per-net work item\npolicy_hthresh.work onto the system workqueue.\n\nThe queued callback, xfrm_hash_rebuild(), retrieves the enclosing\nstruct net via container_of(). If the net namespace is torn down\nbefore that work runs, the associated struct net may already have\nbeen freed, and xfrm_hash_rebuild() may then dereference stale memory.\n\nxfrm_policy_fini() already flushes policy_hash_work during teardown,\nbut it does not synchronize policy_hthresh.work.\n\nSynchronize policy_hthresh.work in xfrm_policy_fini() as well, so the\nqueued work cannot outlive the net namespace teardown and access a\nfreed struct net.",
  "id": "CVE-2026-31516",
  "modified": "2026-07-15T01:49:13.070816911Z",
  "published": "2026-04-22T13:54:32.851Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/29fe3a61bcdce398ee3955101c39f89c01a8a77e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4e2e77843fef473ef47e322d52436d8308582a96"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/56ea2257b83ee29a543f158159e3d1abc1e3e4fe"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8854e9367465d784046362698731c1111e3b39b8"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31516.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31516"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "xfrm: prevent policy_hthresh.work from racing with netns teardown"
}