Improper locking in Linux kernel - CVE-2026-90338
Published: September 18, 2026
Vulnerability identifier: #VU151143
CSH Severity: Low
CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-90338
CWE-ID: CWE-667
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper locking in pl011_console_write_atomic() when processing atomic console writes. A local user can trigger an atomic-context printk while the common-clock enable lock is contended to cause a denial of service.
The condition was reproduced on PREEMPT_RT systems with clock-backed pl011 consoles and may also occur from NMI context.
Affected software
Linux kernel
How to mitigate CVE-2026-90338
Install security update from vendor's repository.