Race condition in Linux kernel - CVE-2026-90167
Published: September 19, 2026
Vulnerability identifier: #VU151311
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-90167
CWE-ID: CWE-362
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause incorrect oplock state handling.
The vulnerability exists due to a race condition in ksmbd oplock handling when handling concurrent SMB requests that close files and break oplocks. A remote attacker can trigger concurrent oplock close and break operations to cause incorrect oplock state handling.
Affected software
Linux kernel
How to mitigate CVE-2026-90167
Install security update from vendor's repository.