xfrm: delete x->tunnel as we delete x

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-40215
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-12-04 13:15:48 UTC
Updated2026-07-30 06:24:18 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: xfrm: delete x->tunnel as we delete x The ipcomp fallback tunnels currently get deleted (from the various lists and hashtables) as the last user state that needed that fallback is destroyed (not deleted). If a reference to that user state still exists, the fallback state will remain on the hashtables/lists, triggering the WARN in xfrm_state_fini. Because of those remaining references, the fix in commit f75a2804da39 ("xfrm: destroy xfrm_state synchronously on net exit path") is not complete. We recently fixed one such situation in TCP due to defered freeing of skbs (commit 9b6412e6979f ("tcp: drop secpath at the same time as we currently drop dst")). This can also happen due to IP reassembly: skbs with a secpath remain on the reassembly queue until netns destruction. If we can't guarantee that the queues are flushed by the time xfrm_state_fini runs, there may still be references to a (user) xfrm_state, preventing the timely deletion of the corresponding fallback state. Instead of chasing each instance of skbs holding a secpath one by one, this patch fixes the issue directly within xfrm, by deleting the fallback state as soon as the last user state depending on it has been deleted. Destruction will still happen when the final reference is dropped. A separate lockdep class for the fallback state is required since we're going to lock x->tunnel while x is locked.

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: 0.001280000 probability, percentile 0.028300000 (date 2026-07-31)

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 9d4139c76905833afcb77fe8ccc17f302a0eb9ab 1b28a7fae0128fa140a7dccd995182ff6cd1c67b git Not specified
CNA Linux Linux affected 9d4139c76905833afcb77fe8ccc17f302a0eb9ab 4b2c17d0f9be8b58bb30468bc81a4b61c985b04e git Not specified
CNA Linux Linux affected 9d4139c76905833afcb77fe8ccc17f302a0eb9ab 0da961fa46da1b37ef868d9b603bd202136f8f8e git Not specified
CNA Linux Linux affected 9d4139c76905833afcb77fe8ccc17f302a0eb9ab d0e0d1097118461463b76562c7ebaabaa5b90b13 git Not specified
CNA Linux Linux affected 9d4139c76905833afcb77fe8ccc17f302a0eb9ab dc3636912d41770466543623cb76e7b88fdb42c7 git Not specified
CNA Linux Linux affected 9d4139c76905833afcb77fe8ccc17f302a0eb9ab b441cf3f8c4b8576639d20c8eb4aa32917602ecd git Not specified
CNA Linux Linux affected 2.6.29 Not specified
CNA Linux Linux unaffected 2.6.29 semver Not specified
CNA Linux Linux unaffected 5.10.248 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.198 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.160 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.120 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.62 6.12.* semver Not specified
CNA Linux Linux unaffected 6.16 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/0da961fa46da1b37ef868d9b603bd202136f8f8e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4b2c17d0f9be8b58bb30468bc81a4b61c985b04e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1b28a7fae0128fa140a7dccd995182ff6cd1c67b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d0e0d1097118461463b76562c7ebaabaa5b90b13 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b441cf3f8c4b8576639d20c8eb4aa32917602ecd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/dc3636912d41770466543623cb76e7b88fdb42c7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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