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vuln-cve/data/2026/53xxx/CVE-2026-53239.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-53239",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-06-09T07:44:35.393Z",
"datePublished": "2026-06-25T08:39:35.149Z",
"dateUpdated": "2026-11-10T12:48:20.190Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-08-05T12:34:25.656Z"
},
"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"
}
],
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"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"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The vulnerable path is reached through NETLINK_XFRM messages such as XFRM_MSG_DELPOLICY and XFRM_MSG_NEWSPDINFO, which require local netlink access rather than remote packet delivery.\nAC:L - The attacker controls both sides of the race by creating/deleting an inexact XFRM policy while concurrently triggering SPD hash rebuilds, with no required external victim state.\nPR:L - XFRM netlink operations require CAP_NET_ADMIN, but the check is namespace-scoped via netlink_net_capable() and is reachable with CAP_NET_ADMIN in a user-created network namespace on systems allowing user namespaces.\nUI:N - No victim action is required; 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."
}
]
}
],
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"versionType": "original_commit_for_fix"
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"cpeApplicability": [
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"nodes": [
{
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"negate": false,
"cpeMatch": [
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"references": [
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},
{
"url": "https://git.kernel.org/stable/c/c4c1ea36d83bf3c4569468ca5b8b614fda1bf821"
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{
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{
"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"
}
},
"adp": [
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"x_adpType": "supplier",
"providerMetadata": {
"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
"shortName": "siemens-SADP",
"dateUpdated": "2026-11-10T12:48:20.190Z"
},
"affected": [
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"metrics": [
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"other": {
"type": "ssvc",
"content": {
"id": "CVE-2026-53239",
"role": "CISA Coordinator",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"version": "2.0.3",
"timestamp": "2026-10-16T15:27:30.875032Z"
}
}
}
],
"problemTypes": [
{
"descriptions": [
{
"lang": "en",
"type": "CWE",
"cweId": "CWE-362",
"description": "CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')"
}
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}
],
"title": "CISA ADP Vulnrichment",
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}
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]
}
}
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