Race condition in Linux kernel - CVE-2026-99250
Published: November 3, 2026
Vulnerability identifier: #VU158991
CSH Severity: Low
CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-99250
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to potentially cause a denial of service by triggering a system hang during boot.
The vulnerability exists due to improper synchronization in the Linux kernel printk subsystem when console-printing kernel threads asynchronously enable and disable interrupts during early SMP initialization. A local user can potentially trigger the affected startup sequence to cause a boot-time hang on susceptible hardware using NBCON consoles.
Affected software
Linux kernel
How to mitigate CVE-2026-99250
Install security update from vendor's repository.