{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "6be3b0db6db82cf056a72cc18042048edd27f8ee"
            },
            {
              "fixed": "8fc536e9f6856230f19c7d13e71af064b6a77b22"
            },
            {
              "fixed": "c4c1ea36d83bf3c4569468ca5b8b614fda1bf821"
            },
            {
              "fixed": "25c8c7fb3b0b9668c7d05e209f58c158d2b020c7"
            },
            {
              "fixed": "42827d03f8009a6a218bacab153e21f39d6a121c"
            },
            {
              "fixed": "88697cf980222d5906a37bf47662dac0732e2a0f"
            },
            {
              "fixed": "b5316e2b8614a87d8736941972441cb47bfd4491"
            },
            {
              "fixed": "ec82ea4eb220164d854f8734ca5a35e23e577b94"
            },
            {
              "fixed": "7f2d76c9c03257c0782afef9d95321fa04096f60"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.0.0"
            },
            {
              "fixed": "5.10.259"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.210"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.176"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.143"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.94"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.36"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.13"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53239.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: policy: fix use-after-free on inexact bin in xfrm_policy_bysel_ctx()\n\nFix the race by pruning the bin while still holding xfrm_policy_lock,\nbefore dropping it. Use __xfrm_policy_inexact_prune_bin() directly since\nthe lock is already held. The wrapper xfrm_policy_inexact_prune_bin()\nbecomes unused and is removed.\n\nRace:\n\n  CPU0 (XFRM_MSG_DELPOLICY)           CPU1 (XFRM_MSG_NEWSPDINFO)\n  ==========================          ==========================\n  xfrm_policy_bysel_ctx():\n    spin_lock_bh(xfrm_policy_lock)\n    bin = xfrm_policy_inexact_lookup()\n    __xfrm_policy_unlink(pol)\n    spin_unlock_bh(xfrm_policy_lock)\n    xfrm_policy_kill(ret)\n    // wide window, lock not held\n                                       xfrm_hash_rebuild():\n                                         spin_lock_bh(xfrm_policy_lock)\n                                         __xfrm_policy_inexact_flush():\n                                           kfree_rcu(bin)  // bin freed\n                                         spin_unlock_bh(xfrm_policy_lock)\n    xfrm_policy_inexact_prune_bin(bin)\n    // UAF: bin is freed",
  "id": "CVE-2026-53239",
  "modified": "2026-07-15T01:48:52.356298699Z",
  "published": "2026-06-25T08:39:35.149Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/25c8c7fb3b0b9668c7d05e209f58c158d2b020c7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/42827d03f8009a6a218bacab153e21f39d6a121c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7f2d76c9c03257c0782afef9d95321fa04096f60"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/88697cf980222d5906a37bf47662dac0732e2a0f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8fc536e9f6856230f19c7d13e71af064b6a77b22"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b5316e2b8614a87d8736941972441cb47bfd4491"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c4c1ea36d83bf3c4569468ca5b8b614fda1bf821"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ec82ea4eb220164d854f8734ca5a35e23e577b94"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53239.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53239"
    },
    {
      "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: policy: fix use-after-free on inexact bin in xfrm_policy_bysel_ctx()"
}