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Vulnerability record · CVE-2026-64136 · published 19 July 2026

CVE-2026-64136: Linux kernel vulnerability

Linux · Linux Kernel

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().

9.8 CVSS 3.1 Critical EPSS 0.67% · top 49.9%
9.8CVSS 3.1 base score
0.67%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References
13 Aug 2026Last modified by NVD

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().

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-64136), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.