CVE-2026-64136
CRITICAL severity · CVSS 9.8 · CWE-362
9.8CVSS CRITICAL
Summary
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().
Impact & exploitability
Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
Exploit probability (EPSS)0%
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products we track (1)
Recommendation
Apply the vendor fix promptly. Open any affected product above for its exact safe version.
Official patch: https://git.kernel.org/stable/c/13fb413ae22a37c69341918a6d651d19a9b0b9b7 ↗
Additional information
- NVD record
- https://git.kernel.org/stable/c/13fb413ae22a37c69341918a6d651d19a9b0b9b7Patch
- https://git.kernel.org/stable/c/4d8690dace005a38e6dbde9ecce2da3ad85c7c41Patch
- https://git.kernel.org/stable/c/7df1df6f40c0720d30206aa35c0343b962350e0dPatch
- https://git.kernel.org/stable/c/bf4ebdb19ff9b3cdf992b50715fe61633327416aPatch
- https://git.kernel.org/stable/c/e374f4e496fef8168784f93a4477d67be34485fdPatch
- https://git.kernel.org/stable/c/7585d4242f59185b084957fa077396e53dbf7c24