xfrm: policy: fix use-after-free on inexact bin in xfrm_policy_bysel_ctx()

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Summary

CVECVE-2026-53239
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-25 09:16:41 UTC
Updated2026-06-28 08:16:40 UTC
DescriptionIn 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

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001840000 probability, percentile 0.082200000 (date 2026-06-27)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 6be3b0db6db82cf056a72cc18042048edd27f8ee 8fc536e9f6856230f19c7d13e71af064b6a77b22 git Not specified
CNA Linux Linux affected 6be3b0db6db82cf056a72cc18042048edd27f8ee c4c1ea36d83bf3c4569468ca5b8b614fda1bf821 git Not specified
CNA Linux Linux affected 6be3b0db6db82cf056a72cc18042048edd27f8ee 25c8c7fb3b0b9668c7d05e209f58c158d2b020c7 git Not specified
CNA Linux Linux affected 6be3b0db6db82cf056a72cc18042048edd27f8ee 42827d03f8009a6a218bacab153e21f39d6a121c git Not specified
CNA Linux Linux affected 6be3b0db6db82cf056a72cc18042048edd27f8ee 88697cf980222d5906a37bf47662dac0732e2a0f git Not specified
CNA Linux Linux affected 6be3b0db6db82cf056a72cc18042048edd27f8ee b5316e2b8614a87d8736941972441cb47bfd4491 git Not specified
CNA Linux Linux affected 6be3b0db6db82cf056a72cc18042048edd27f8ee ec82ea4eb220164d854f8734ca5a35e23e577b94 git Not specified
CNA Linux Linux affected 6be3b0db6db82cf056a72cc18042048edd27f8ee 7f2d76c9c03257c0782afef9d95321fa04096f60 git Not specified
CNA Linux Linux affected 5.0 Not specified
CNA Linux Linux unaffected 5.0 semver Not specified
CNA Linux Linux unaffected 5.10.259 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.210 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.176 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.143 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.94 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.36 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.13 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/8fc536e9f6856230f19c7d13e71af064b6a77b22 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7f2d76c9c03257c0782afef9d95321fa04096f60 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/25c8c7fb3b0b9668c7d05e209f58c158d2b020c7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ec82ea4eb220164d854f8734ca5a35e23e577b94 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b5316e2b8614a87d8736941972441cb47bfd4491 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/42827d03f8009a6a218bacab153e21f39d6a121c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/88697cf980222d5906a37bf47662dac0732e2a0f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c4c1ea36d83bf3c4569468ca5b8b614fda1bf821 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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