CVE-2026-64136smb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked()
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 953953abb66e52c224057ab91e404284fefeab62 builds before 7df1df6f40c0720d30206aa35c0343b962350e0d; 601dd3b79769b38d30b693c40afdb2a4b7edf9d0 builds before 13fb413ae22a37c69341918a6d651d19a9b0b9b7; from 3969db6b22e3d90d8c5f22ac1a7fe0350a94c136 before bf4ebdb19ff9b3cdf992b50715fe61633327416a; from 96c4af418586ee9a6aab61738644366426e05316 before e374f4e496fef8168784f93a4477d67be34485fd; 96c4af418586ee9a6aab61738644366426e05316 builds before 4d8690dace005a38e6dbde9ecce2da3ad85c7c41; 8c59eeeeffa1524ef57e173a89a1a3ff539888d5; from 6.6.128 before 6.6.142; from 6.12.75 before 6.12.92; and 2 more ranges | CNA record |
linux linux_kernel linux:linux_kernel | from 6.6.128 before 6.6.142; from 6.12.75 before 6.12.92; from 6.18.16 before 6.18.34; from 6.19.6 before 7.0.11; 7.1; 7.1; 7.1; 7.1 | NVD |
References
- https://git.kernel.org/stable/c/7df1df6f40c0720d30206aa35c0343b962350e0dpatch
- https://git.kernel.org/stable/c/13fb413ae22a37c69341918a6d651d19a9b0b9b7patch
- https://git.kernel.org/stable/c/bf4ebdb19ff9b3cdf992b50715fe61633327416apatch
- https://git.kernel.org/stable/c/e374f4e496fef8168784f93a4477d67be34485fdpatch
- https://git.kernel.org/stable/c/4d8690dace005a38e6dbde9ecce2da3ad85c7c41patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.