Critical severity9.8NVD Advisory· Published Jul 19, 2026· Updated Aug 13, 2026
CVE-2026-64136
CVE-2026-64136
Description
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().
Affected products
7cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*+ 5 more
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*range: >=6.6.128,<6.6.142
- cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:*
- (no CPE)
Patches
Vulnerability mechanics
References
5- git.kernel.org/stable/c/13fb413ae22a37c69341918a6d651d19a9b0b9b7nvdPatch
- git.kernel.org/stable/c/4d8690dace005a38e6dbde9ecce2da3ad85c7c41nvdPatch
- git.kernel.org/stable/c/7df1df6f40c0720d30206aa35c0343b962350e0dnvdPatch
- git.kernel.org/stable/c/bf4ebdb19ff9b3cdf992b50715fe61633327416anvdPatch
- git.kernel.org/stable/c/e374f4e496fef8168784f93a4477d67be34485fdnvdPatch
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