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CVE-2026-64136

kernel: smb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked()

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Severity

Moderate

Red Hat Product Security

7

CVSS 3.1

Review impact separately from score.

Published · July 19, 2026

Updated · October 29, 2026

Description

A flaw was found in the Linux kernel's Server Message Block (SMB) client. A missing lock around the tc_count increment in the smb2_find_smb_sess_tcon_unlocked() function creates a race condition. This vulnerability, caused by an incomplete refactoring of locking mechanisms, could lead to unexpected behavior.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 7
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE-414 · Missing Lock Check