CVE-2026-53239 (GCVE-0-2026-53239)
Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-06-28 06:40
VLAI?
Title
xfrm: policy: fix use-after-free on inexact bin in xfrm_policy_bysel_ctx()
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
Severity ?
7.8 (High)
Assigner
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Linux | Linux |
Affected:
6be3b0db6db82cf056a72cc18042048edd27f8ee , < 8fc536e9f6856230f19c7d13e71af064b6a77b22
(git)
Affected: 6be3b0db6db82cf056a72cc18042048edd27f8ee , < c4c1ea36d83bf3c4569468ca5b8b614fda1bf821 (git) Affected: 6be3b0db6db82cf056a72cc18042048edd27f8ee , < 25c8c7fb3b0b9668c7d05e209f58c158d2b020c7 (git) Affected: 6be3b0db6db82cf056a72cc18042048edd27f8ee , < 42827d03f8009a6a218bacab153e21f39d6a121c (git) Affected: 6be3b0db6db82cf056a72cc18042048edd27f8ee , < 88697cf980222d5906a37bf47662dac0732e2a0f (git) Affected: 6be3b0db6db82cf056a72cc18042048edd27f8ee , < b5316e2b8614a87d8736941972441cb47bfd4491 (git) Affected: 6be3b0db6db82cf056a72cc18042048edd27f8ee , < ec82ea4eb220164d854f8734ca5a35e23e577b94 (git) Affected: 6be3b0db6db82cf056a72cc18042048edd27f8ee , < 7f2d76c9c03257c0782afef9d95321fa04096f60 (git) |
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{
"containers": {
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"programFiles": [
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"version": "5.0"
},
{
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"version": "0",
"versionType": "semver"
},
{
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"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",
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},
{
"lessThanOrEqual": "6.6.*",
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},
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},
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{
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}
]
}
],
"cpeApplicability": [
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"nodes": [
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}
],
"negate": false,
"operator": "OR"
}
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}
],
"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"
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{
"url": "https://git.kernel.org/stable/c/88697cf980222d5906a37bf47662dac0732e2a0f"
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{
"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"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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