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CVE-2025-40215

xfrm: delete x->tunnel as we delete x

HIGH 7.8

At a glance

Source
NVD
EPSS
EPSS 0.14 % · percentile 4 ()
State
PUBLISHED
Published
Updated
Assigner
Linux
NVD status
Deferred

Description

In 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.

References

Scores

VersionScoreVectorScored by
CVSS 3.1HIGH 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HLinux
CVSS 3.1HIGH 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HNVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary)

European references

CERT-FR advisories

Affected products

ProductVersions
Linux · Linuxaffected 9d4139c76905833afcb77fe8ccc17f302a0eb9ab < 1b28a7fae0128fa140a7dccd995182ff6cd1c67b ; affected 9d4139c76905833afcb77fe8ccc17f302a0eb9ab < 4b2c17d0f9be8b58bb30468bc81a4b61c985b04e ; affected 9d4139c76905833afcb77fe8ccc17f302a0eb9ab < 0da961fa46da1b37ef868d9b603bd202136f8f8e ; affected 9d4139c76905833afcb77fe8ccc17f302a0eb9ab < d0e0d1097118461463b76562c7ebaabaa5b90b13 ; affected 9d4139c76905833afcb77fe8ccc17f302a0eb9ab < dc3636912d41770466543623cb76e7b88fdb42c7 ; affected 9d4139c76905833afcb77fe8ccc17f302a0eb9ab < b441cf3f8c4b8576639d20c8eb4aa32917602ecd
Linux · Linuxaffected 2.6.29 ; unaffected 0 < 2.6.29 ; unaffected 5.10.248 ≤ 5.10.* ; unaffected 5.15.198 ≤ 5.15.* ; unaffected 6.1.160 ≤ 6.1.* ; unaffected 6.6.120 ≤ 6.6.*

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD