smb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked()

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Summary

CVECVE-2026-64136
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:55 UTC
Updated2026-07-19 16:17:55 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: smb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked() Commit 96c4af418586 ("cifs: Fix locking usage for tcon fields") refactored cifs code to change cifs_tcp_ses_lock for tc_lock around tc_count changes. There was missing lock around tc_count increment inside smb2_find_smb_sess_tcon_unlocked().

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 953953abb66e52c224057ab91e404284fefeab62 7df1df6f40c0720d30206aa35c0343b962350e0d git Not specified
CNA Linux Linux affected 601dd3b79769b38d30b693c40afdb2a4b7edf9d0 13fb413ae22a37c69341918a6d651d19a9b0b9b7 git Not specified
CNA Linux Linux affected 3969db6b22e3d90d8c5f22ac1a7fe0350a94c136 bf4ebdb19ff9b3cdf992b50715fe61633327416a git Not specified
CNA Linux Linux affected 96c4af418586ee9a6aab61738644366426e05316 e374f4e496fef8168784f93a4477d67be34485fd git Not specified
CNA Linux Linux affected 96c4af418586ee9a6aab61738644366426e05316 4d8690dace005a38e6dbde9ecce2da3ad85c7c41 git Not specified
CNA Linux Linux affected 8c59eeeeffa1524ef57e173a89a1a3ff539888d5 git Not specified
CNA Linux Linux affected 6.6.128 6.6.142 semver Not specified
CNA Linux Linux affected 6.12.75 6.12.92 semver Not specified
CNA Linux Linux affected 6.18.16 6.18.34 semver Not specified
CNA Linux Linux affected 6.19.6 6.20 semver Not specified
CNA Linux Linux affected 7.0 Not specified
CNA Linux Linux unaffected 7.0 semver Not specified
CNA Linux Linux unaffected 6.6.142 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.92 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.34 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.11 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/4d8690dace005a38e6dbde9ecce2da3ad85c7c41 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e374f4e496fef8168784f93a4477d67be34485fd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7df1df6f40c0720d30206aa35c0343b962350e0d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bf4ebdb19ff9b3cdf992b50715fe61633327416a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/13fb413ae22a37c69341918a6d651d19a9b0b9b7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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