mptcp: pm: ADD_ADDR rtx: always decrease sk refcount

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Summary

CVECVE-2026-46158
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-28 10:16:31 UTC
Updated2026-05-28 13:44:01 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: mptcp: pm: ADD_ADDR rtx: always decrease sk refcount When an ADD_ADDR is retransmitted, the sk is held in sk_reset_timer(). It should then be released in all cases at the end. Some (unlikely) checks were returning directly instead of calling sock_put() to decrease the refcount. Jump to a new 'exit' label to call __sock_put() (which will become sock_put() in the next commit) to fix this potential leak. While at it, drop the '!msk' check which cannot happen because it is never reset, and explicitly mark the remaining one as "unlikely".

Risk And Classification

EPSS: 0.000170000 probability, percentile 0.043220000 (date 2026-05-28)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 00cfd77b9063dcdf3628a7087faba60de85a9cc8 acd3d3562315c99f3c0db16f0fcc5f0306638982 git Not specified
CNA Linux Linux affected 00cfd77b9063dcdf3628a7087faba60de85a9cc8 25e37407442b8766ec2cf52fb4e31b5c3d3aeeae git Not specified
CNA Linux Linux affected 00cfd77b9063dcdf3628a7087faba60de85a9cc8 9634cb35af17019baec21ca648516ce376fa10e6 git Not specified
CNA Linux Linux affected 5.10 Not specified
CNA Linux Linux unaffected 5.10 semver Not specified
CNA Linux Linux unaffected 6.18.30 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.7 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/9634cb35af17019baec21ca648516ce376fa10e6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/25e37407442b8766ec2cf52fb4e31b5c3d3aeeae 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/acd3d3562315c99f3c0db16f0fcc5f0306638982 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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