CVE-2026-43326

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

Description A deadlock occurs in the sched ext component due to the SCX KICK WAIT mechanism. The kick cpus irq workfn() function performs a busy-wait using smp cond load acquire() until the target CPU's kick sync advances. Since this process runs in a hardirq context (a high-priority interrupt handler that prevents other tasks from running on that CPU), the waiting CPU cannot reschedule, preventing its own kick sync from advancing. This can lead to a system-wide deadlock if multiple CPUs form a wait cycle.

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