Improper locking in Linux kernel - CVE-2026-74468
Published: August 16, 2026
Vulnerability identifier: #VU143313
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-74468
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 lock type selection in the pch_irq_type() callback and gpio-pch register locking logic when configuring IRQ trigger types on PREEMPT_RT kernels. A local user can trigger IRQ type configuration in a non-sleepable context to cause a denial of service.
The issue occurs on PREEMPT_RT kernels because a regular spinlock_t may become an rtmutex-backed sleeping lock in atomic context.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-74468
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.105-1
linux (Debian package) - update to 6.12.105-1
External References
- https://git.kernel.org/stable/c/16da33cb36e663b6967112185e11d00ce8ff957c
- https://git.kernel.org/stable/c/466ab0c41d5f54f71cee60619d07c4abd0ffd2cd
- https://git.kernel.org/stable/c/a02b8950d619123da64f69b70fe1dadef217dfe4
- https://git.kernel.org/stable/c/c0a4ec89fc26e4b679b04f1002c503cb2529acdc
- https://git.kernel.org/stable/c/ff050589a21967883bb55f6dba42568f8367ad4a