CVE-2026-64136 Details
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().
A vulnerability in the Linux kernel's SMB2 client has been addressed, specifically in the function responsible for managing session transport connections. The issue arose because a recent code refactor failed to properly secure the increment of a reference count with the appropriate locking mechanism. This oversight could potentially lead to race conditions or inconsistent state management within the session handling process.
Users can upgrade to the latest version of the Linux kernel where this vulnerability has been fixed. The specific commit addressing this issue is '4d8690dace005a38e6dbde9ecce2da3ad85c7c41', which is included in the official Linux kernel stable releases.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/13fb413ae22a37c69341918a6d651d19a9b0b9b7 | kernel.org | Patch |
| https://git.kernel.org/stable/c/4d8690dace005a38e6dbde9ecce2da3ad85c7c41 | kernel.org | Patch |
| https://git.kernel.org/stable/c/7df1df6f40c0720d30206aa35c0343b962350e0d | kernel.org | Patch |
| https://git.kernel.org/stable/c/bf4ebdb19ff9b3cdf992b50715fe61633327416a | kernel.org | Patch |
| https://git.kernel.org/stable/c/e374f4e496fef8168784f93a4477d67be34485fd | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| NVD-CWE-noinfo | Insufficient Information to Classify Weakness | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 6.6.128, < 6.6.142 >= 6.12.75, < 6.12.92 >= 6.18.16, < 6.18.34 >= 6.19.6, < 7.0.11 7.1 rc1 7.1 rc2 7.1 rc3 7.1 rc4 |
CPE
Remediation
| |
Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Aug 13, 2026 | Initial Analysis | [email protected] |
| Jul 20, 2026 | CVE Modified | kernel.org |
| Jul 19, 2026 | New CVE Received | kernel.org |