Time-of-check Time-of-use (TOCTOU) Race Condition in Linux kernel - CVE-2026-98423
Published: October 15, 2026
Vulnerability identifier: #VU155892
CSH Severity: Low
CVSS v4: 0 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-98423
CWE-ID: CWE-367
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to trigger a kernel warning.
The vulnerability exists due to a time-of-check time-of-use race condition in mac80211_hwsim when processing frames from wmediumd during radio shutdown. A local user can submit frames from userspace concurrently with radio shutdown to trigger a kernel warning.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-98423
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.113-1
linux (Debian package) - update to 6.12.113-1
External References
- https://git.kernel.org/stable/c/2f59be7585dc81baa6f36b0035dd6848ea43d318
- https://git.kernel.org/stable/c/5c79ef616aa16af582fb2cb93b0f750975a0004f
- https://git.kernel.org/stable/c/5ce9b2bc9e73213e316a8c72400256a76bf41814
- https://git.kernel.org/stable/c/87840d4a3a21b1c19b867a80e16ba69dff284de2
- https://git.kernel.org/stable/c/c4e4fe330294e3936e0f4e15d6996468f8a45fb2
- https://git.kernel.org/stable/c/d7fa45d8123a7f794b93fc22dbcf19f38dc4d8cb