CVE-2026-53239 (GCVE-0-2026-53239)
Vulnerability from cvelistv5
Published
2026-06-25 08:39
Modified
2026-10-19 19:57
Summary
In the Linux kernel, the following vulnerability has been resolved: xfrm: policy: fix use-after-free on inexact bin in xfrm_policy_bysel_ctx() Fix the race by pruning the bin while still holding xfrm_policy_lock, before dropping it. Use __xfrm_policy_inexact_prune_bin() directly since the lock is already held. The wrapper xfrm_policy_inexact_prune_bin() becomes unused and is removed. Race: CPU0 (XFRM_MSG_DELPOLICY) CPU1 (XFRM_MSG_NEWSPDINFO) ========================== ========================== xfrm_policy_bysel_ctx(): spin_lock_bh(xfrm_policy_lock) bin = xfrm_policy_inexact_lookup() __xfrm_policy_unlink(pol) spin_unlock_bh(xfrm_policy_lock) xfrm_policy_kill(ret) // wide window, lock not held xfrm_hash_rebuild(): spin_lock_bh(xfrm_policy_lock) __xfrm_policy_inexact_flush(): kfree_rcu(bin) // bin freed spin_unlock_bh(xfrm_policy_lock) xfrm_policy_inexact_prune_bin(bin) // UAF: bin is freed
Impacted products
Vendor Product Version
Linux Linux Version: 6be3b0db6db82cf056a72cc18042048edd27f8ee
Version: 6be3b0db6db82cf056a72cc18042048edd27f8ee
Version: 6be3b0db6db82cf056a72cc18042048edd27f8ee
Version: 6be3b0db6db82cf056a72cc18042048edd27f8ee
Version: 6be3b0db6db82cf056a72cc18042048edd27f8ee
Version: 6be3b0db6db82cf056a72cc18042048edd27f8ee
Version: 6be3b0db6db82cf056a72cc18042048edd27f8ee
Version: 6be3b0db6db82cf056a72cc18042048edd27f8ee
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    "vulnrichment": {
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the attacker can issue the needed netlink messages directly.\\nS:U - The vulnerability corrupts kernel networking/XFRM state within the same kernel security authority and does not cross a hypervisor, IOMMU, or separate trust boundary.\\nC:H - This is a use-after-free of an XFRM inexact policy bin, and the stale freed object can be dereferenced after attacker-controlled heap reuse, making high confidentiality impact defensible.\\nI:H - The stale bin is not only read but also passed into pruning logic that writes list/rhashtable/seqcount state, so exploitation can plausibly yield memory corruption and control-flow or data integrity compromise.\\nA:H - The UAF can trigger kernel memory corruption, KASAN splats, oopses, or panics, giving high availability impact.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6be3b0db6db82cf056a72cc18042048edd27f8ee\", \"lessThan\": \"8fc536e9f6856230f19c7d13e71af064b6a77b22\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6be3b0db6db82cf056a72cc18042048edd27f8ee\", \"lessThan\": \"c4c1ea36d83bf3c4569468ca5b8b614fda1bf821\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6be3b0db6db82cf056a72cc18042048edd27f8ee\", \"lessThan\": \"25c8c7fb3b0b9668c7d05e209f58c158d2b020c7\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6be3b0db6db82cf056a72cc18042048edd27f8ee\", \"lessThan\": \"42827d03f8009a6a218bacab153e21f39d6a121c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6be3b0db6db82cf056a72cc18042048edd27f8ee\", \"lessThan\": \"88697cf980222d5906a37bf47662dac0732e2a0f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6be3b0db6db82cf056a72cc18042048edd27f8ee\", \"lessThan\": \"b5316e2b8614a87d8736941972441cb47bfd4491\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6be3b0db6db82cf056a72cc18042048edd27f8ee\", \"lessThan\": \"ec82ea4eb220164d854f8734ca5a35e23e577b94\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6be3b0db6db82cf056a72cc18042048edd27f8ee\", \"lessThan\": \"7f2d76c9c03257c0782afef9d95321fa04096f60\", \"versionType\": \"git\"}], \"programFiles\": [\"net/xfrm/xfrm_policy.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.0\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.0\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.259\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.210\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.176\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.143\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.94\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.36\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.0.13\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.0.*\"}, {\"status\": \"unaffected\", \"version\": \"7.1\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/xfrm/xfrm_policy.c\"], \"defaultStatus\": \"affected\"}], \"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.259\", \"versionStartIncluding\": \"5.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.210\", \"versionStartIncluding\": \"5.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.176\", \"versionStartIncluding\": \"5.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.143\", \"versionStartIncluding\": \"5.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.94\", \"versionStartIncluding\": \"5.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.36\", \"versionStartIncluding\": \"5.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.0.13\", \"versionStartIncluding\": \"5.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1\", \"versionStartIncluding\": \"5.0\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:34:25.656Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-53239\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-15T01:22:55.050Z\", \"dateReserved\": \"2026-06-09T07:44:35.393Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-06-25T08:39:35.149Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
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