xfrm: fix stale skb->prev after async crypto steals a GSO segment

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Summary

CVECVE-2026-68426
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-10 13:20:36 UTC
Updated2026-08-10 13:20:36 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: xfrm: fix stale skb->prev after async crypto steals a GSO segment skb_gso_segment() leaves the segment list head with ->prev pointing at the last segment, an invariant validate_xmit_skb_list() relies on when it sets its tail pointer (tail = skb->prev). When validate_xmit_xfrm() walks a GSO list and some segments are stolen by async crypto (->xmit() returns -EINPROGRESS), those segments are unlinked from the list but the head ->prev is never updated. If the last segment is the one stolen, the returned head still has ->prev pointing at it, even though it is now owned by the crypto engine and may be freed. validate_xmit_skb_list() later does tail->next = skb, writing through that stale pointer -- a use-after-free. Repoint skb->prev at the last retained segment before returning.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected f53c723902d1ac5f0b0a11d7c9dcbff748dde74e 33e1b0d25ca0d2818c635ff80e6aa0d295e08a98 git Not specified
CNA Linux Linux affected f53c723902d1ac5f0b0a11d7c9dcbff748dde74e bbca7cc3b2b4b10afbfee99b81d9ee78f5423046 git Not specified
CNA Linux Linux affected f53c723902d1ac5f0b0a11d7c9dcbff748dde74e 3f4c3919baf0944ad96580467c302bc6c7758b00 git Not specified
CNA Linux Linux affected 4.16 Not specified
CNA Linux Linux unaffected 4.16 semver Not specified
CNA Linux Linux unaffected 6.18.42 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.6 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc4 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/bbca7cc3b2b4b10afbfee99b81d9ee78f5423046 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/33e1b0d25ca0d2818c635ff80e6aa0d295e08a98 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3f4c3919baf0944ad96580467c302bc6c7758b00 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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