{"id":"CVE-2026-53239","revision":"e03babf5a6f0483f89ed0866f5c6a738","records":[{"revision":"e03babf5a6f0483f89ed0866f5c6a738","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-53239","aliases":[],"title":"xfrm: policy: fix use-after-free on inexact bin in xfrm_policy_bysel_ctx()","description":"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","state":0,"publishedAt":"2026-06-25T08:39:35.149+00:00","modifiedAt":"2026-10-19T19:57:30.877+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/xfrm/xfrm_policy.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6be3b0db6db82cf056a72cc18042048edd27f8ee\",\n                            \"lessThan\": \"8fc536e9f6856230f19c7d13e71af064b6a77b22\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6be3b0db6db82cf056a72cc18042048edd27f8ee\",\n                            \"lessThan\": \"c4c1ea36d83bf3c4569468ca5b8b614fda1bf821\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6be3b0db6db82cf056a72cc18042048edd27f8ee\",\n                            \"lessThan\": \"25c8c7fb3b0b9668c7d05e209f58c158d2b020c7\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6be3b0db6db82cf056a72cc18042048edd27f8ee\",\n                            \"lessThan\": \"42827d03f8009a6a218bacab153e21f39d6a121c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6be3b0db6db82cf056a72cc18042048edd27f8ee\",\n                            \"lessThan\": \"88697cf980222d5906a37bf47662dac0732e2a0f\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6be3b0db6db82cf056a72cc18042048edd27f8ee\",\n                            \"lessThan\": \"b5316e2b8614a87d8736941972441cb47bfd4491\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6be3b0db6db82cf056a72cc18042048edd27f8ee\",\n                            \"lessThan\": \"ec82ea4eb220164d854f8734ca5a35e23e577b94\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6be3b0db6db82cf056a72cc18042048edd27f8ee\",\n                            \"lessThan\": \"7f2d76c9c03257c0782afef9d95321fa04096f60\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/xfrm/xfrm_policy.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.0\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.259\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.210\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.176\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.143\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.94\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.36\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0.13\",\n                            \"lessThanOrEqual\": \"7.0.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/8fc536e9f6856230f19c7d13e71af064b6a77b22","https://git.kernel.org/stable/c/c4c1ea36d83bf3c4569468ca5b8b614fda1bf821","https://git.kernel.org/stable/c/25c8c7fb3b0b9668c7d05e209f58c158d2b020c7","https://git.kernel.org/stable/c/42827d03f8009a6a218bacab153e21f39d6a121c","https://git.kernel.org/stable/c/88697cf980222d5906a37bf47662dac0732e2a0f","https://git.kernel.org/stable/c/b5316e2b8614a87d8736941972441cb47bfd4491","https://git.kernel.org/stable/c/ec82ea4eb220164d854f8734ca5a35e23e577b94","https://git.kernel.org/stable/c/7f2d76c9c03257c0782afef9d95321fa04096f60"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-53239","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-53239","identifiers":["CVE-2026-53239"]},"retained":false,"historicalAffected":[]}],"coverage":[]}