CVE-2026-64136

In 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().

CVSS 3.1

9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

0.4% chance of exploitation in the next 30 days; higher than 31% of CVEs (scores of 2026-10-25)

CWE

CWE-362

Published

2026-07-19

Modified

2026-10-19

Record from

the NVD, synced 2026-10-21

Affected

• linux:linux_kernel

References

• https://git.kernel.org/stable/c/13fb413ae22a37c69341918a6d651d19a9b0b9b7
• https://git.kernel.org/stable/c/4d8690dace005a38e6dbde9ecce2da3ad85c7c41
• https://git.kernel.org/stable/c/7df1df6f40c0720d30206aa35c0343b962350e0d
• https://git.kernel.org/stable/c/bf4ebdb19ff9b3cdf992b50715fe61633327416a
• https://git.kernel.org/stable/c/e374f4e496fef8168784f93a4477d67be34485fd

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