CVE-2026-43227

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description An issue exists in the TMU device driver, which serves as both a clocksource and a clockevent provider. The driver attempts to manage power and clock states dynamically; however, when the TMU registers itself via clockevents register device(), it operates within a context requiring raw spinlocks. Because the driver calls pm runtime *() and clk *() functions while holding a raw spinlock, and these functions subsequently call other platform drivers that use regular spinlocks, a conflict in spinlock contexts occurs. This specifically affects PREEMPT RT builds where normal spinlocks can sleep, leading to a lockdep warning and an invalid wait context.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.