xfrm: fix refcount leak in xfrm_migrate_policy_find

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Summary

CVECVE-2026-43090
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-06 10:16:22 UTC
Updated2026-05-19 20:44:03 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: xfrm: fix refcount leak in xfrm_migrate_policy_find syzkaller reported a memory leak in xfrm_policy_alloc: BUG: memory leak unreferenced object 0xffff888114d79000 (size 1024): comm "syz.1.17", pid 931 ... xfrm_policy_alloc+0xb3/0x4b0 net/xfrm/xfrm_policy.c:432 The root cause is a double call to xfrm_pol_hold_rcu() in xfrm_migrate_policy_find(). The lookup function already returns a policy with held reference, making the second call redundant. Remove the redundant xfrm_pol_hold_rcu() call to fix the refcount imbalance and prevent the memory leak. Found by Linux Verification Center (linuxtesting.org) with Syzkaller.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

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

Problem Types: NVD-CWE-Other

CVSS v3.1 Breakdown

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

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 563d5ca93e883b9dcb4b7dc8967ac569fd91820d 21e235a36cfb6d145cefb10728f12f5dc5412f54 git Not specified
CNA Linux Linux affected 563d5ca93e883b9dcb4b7dc8967ac569fd91820d 836ee1b0426ea3db31531e9581cc32f513d24e32 git Not specified
CNA Linux Linux affected 563d5ca93e883b9dcb4b7dc8967ac569fd91820d 70c2a89a3bc207c3bfbf6f21bb439809e0a4a27a git Not specified
CNA Linux Linux affected 563d5ca93e883b9dcb4b7dc8967ac569fd91820d 83317cce60a032c49480dcdabe146435bd689d03 git Not specified
CNA Linux Linux affected 6.12 Not specified
CNA Linux Linux unaffected 6.12 semver Not specified
CNA Linux Linux unaffected 6.12.83 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.24 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.14 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/836ee1b0426ea3db31531e9581cc32f513d24e32 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/21e235a36cfb6d145cefb10728f12f5dc5412f54 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/70c2a89a3bc207c3bfbf6f21bb439809e0a4a27a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/83317cce60a032c49480dcdabe146435bd689d03 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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