{"api_version":"1","generated_at":"2026-06-28T18:48:12+00:00","cve":"CVE-2026-53239","urls":{"html":"https://cve.report/CVE-2026-53239","api":"https://cve.report/api/cve/CVE-2026-53239.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-53239","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-53239"},"summary":{"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":"PUBLISHED","assigner":"Linux","published_at":"2026-06-25 09:16:41","updated_at":"2026-06-28 08:16:40"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/8fc536e9f6856230f19c7d13e71af064b6a77b22","name":"https://git.kernel.org/stable/c/8fc536e9f6856230f19c7d13e71af064b6a77b22","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7f2d76c9c03257c0782afef9d95321fa04096f60","name":"https://git.kernel.org/stable/c/7f2d76c9c03257c0782afef9d95321fa04096f60","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/25c8c7fb3b0b9668c7d05e209f58c158d2b020c7","name":"https://git.kernel.org/stable/c/25c8c7fb3b0b9668c7d05e209f58c158d2b020c7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ec82ea4eb220164d854f8734ca5a35e23e577b94","name":"https://git.kernel.org/stable/c/ec82ea4eb220164d854f8734ca5a35e23e577b94","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b5316e2b8614a87d8736941972441cb47bfd4491","name":"https://git.kernel.org/stable/c/b5316e2b8614a87d8736941972441cb47bfd4491","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/42827d03f8009a6a218bacab153e21f39d6a121c","name":"https://git.kernel.org/stable/c/42827d03f8009a6a218bacab153e21f39d6a121c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/88697cf980222d5906a37bf47662dac0732e2a0f","name":"https://git.kernel.org/stable/c/88697cf980222d5906a37bf47662dac0732e2a0f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c4c1ea36d83bf3c4569468ca5b8b614fda1bf821","name":"https://git.kernel.org/stable/c/c4c1ea36d83bf3c4569468ca5b8b614fda1bf821","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-53239","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53239","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6be3b0db6db82cf056a72cc18042048edd27f8ee 8fc536e9f6856230f19c7d13e71af064b6a77b22 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6be3b0db6db82cf056a72cc18042048edd27f8ee c4c1ea36d83bf3c4569468ca5b8b614fda1bf821 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6be3b0db6db82cf056a72cc18042048edd27f8ee 25c8c7fb3b0b9668c7d05e209f58c158d2b020c7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6be3b0db6db82cf056a72cc18042048edd27f8ee 42827d03f8009a6a218bacab153e21f39d6a121c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6be3b0db6db82cf056a72cc18042048edd27f8ee 88697cf980222d5906a37bf47662dac0732e2a0f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6be3b0db6db82cf056a72cc18042048edd27f8ee b5316e2b8614a87d8736941972441cb47bfd4491 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6be3b0db6db82cf056a72cc18042048edd27f8ee ec82ea4eb220164d854f8734ca5a35e23e577b94 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6be3b0db6db82cf056a72cc18042048edd27f8ee 7f2d76c9c03257c0782afef9d95321fa04096f60 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.0","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.0 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.259 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.210 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.176 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.143 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.94 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.36 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.13 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"53239","cve":"CVE-2026-53239","epss":"0.001840000","percentile":"0.082200000","score_date":"2026-06-27","updated_at":"2026-06-28 00:08:50"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/xfrm/xfrm_policy.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"8fc536e9f6856230f19c7d13e71af064b6a77b22","status":"affected","version":"6be3b0db6db82cf056a72cc18042048edd27f8ee","versionType":"git"},{"lessThan":"c4c1ea36d83bf3c4569468ca5b8b614fda1bf821","status":"affected","version":"6be3b0db6db82cf056a72cc18042048edd27f8ee","versionType":"git"},{"lessThan":"25c8c7fb3b0b9668c7d05e209f58c158d2b020c7","status":"affected","version":"6be3b0db6db82cf056a72cc18042048edd27f8ee","versionType":"git"},{"lessThan":"42827d03f8009a6a218bacab153e21f39d6a121c","status":"affected","version":"6be3b0db6db82cf056a72cc18042048edd27f8ee","versionType":"git"},{"lessThan":"88697cf980222d5906a37bf47662dac0732e2a0f","status":"affected","version":"6be3b0db6db82cf056a72cc18042048edd27f8ee","versionType":"git"},{"lessThan":"b5316e2b8614a87d8736941972441cb47bfd4491","status":"affected","version":"6be3b0db6db82cf056a72cc18042048edd27f8ee","versionType":"git"},{"lessThan":"ec82ea4eb220164d854f8734ca5a35e23e577b94","status":"affected","version":"6be3b0db6db82cf056a72cc18042048edd27f8ee","versionType":"git"},{"lessThan":"7f2d76c9c03257c0782afef9d95321fa04096f60","status":"affected","version":"6be3b0db6db82cf056a72cc18042048edd27f8ee","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/xfrm/xfrm_policy.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.0"},{"lessThan":"5.0","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.259","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.210","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.176","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.143","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.94","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.36","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.13","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.259","versionStartIncluding":"5.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.210","versionStartIncluding":"5.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.176","versionStartIncluding":"5.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.143","versionStartIncluding":"5.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.94","versionStartIncluding":"5.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.36","versionStartIncluding":"5.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.13","versionStartIncluding":"5.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1","versionStartIncluding":"5.0","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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"}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-06-28T06:40:46.548Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/8fc536e9f6856230f19c7d13e71af064b6a77b22"},{"url":"https://git.kernel.org/stable/c/c4c1ea36d83bf3c4569468ca5b8b614fda1bf821"},{"url":"https://git.kernel.org/stable/c/25c8c7fb3b0b9668c7d05e209f58c158d2b020c7"},{"url":"https://git.kernel.org/stable/c/42827d03f8009a6a218bacab153e21f39d6a121c"},{"url":"https://git.kernel.org/stable/c/88697cf980222d5906a37bf47662dac0732e2a0f"},{"url":"https://git.kernel.org/stable/c/b5316e2b8614a87d8736941972441cb47bfd4491"},{"url":"https://git.kernel.org/stable/c/ec82ea4eb220164d854f8734ca5a35e23e577b94"},{"url":"https://git.kernel.org/stable/c/7f2d76c9c03257c0782afef9d95321fa04096f60"}],"title":"xfrm: policy: fix use-after-free on inexact bin in xfrm_policy_bysel_ctx()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-53239","datePublished":"2026-06-25T08:39:35.149Z","dateReserved":"2026-06-09T07:44:35.393Z","dateUpdated":"2026-06-28T06:40:46.548Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-06-25 09:16:41","lastModifiedDate":"2026-06-28 08:16:40","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"53239","Ordinal":"1","Title":"xfrm: policy: fix use-after-free on inexact bin in xfrm_policy_b","CVE":"CVE-2026-53239","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"53239","Ordinal":"1","NoteData":"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","Type":"Description","Title":"xfrm: policy: fix use-after-free on inexact bin in xfrm_policy_b"}]}}}