CVE-2026-80626

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

Description A preempt count underflow exists in the fsl emb pmu del() function. The function calls put cpu var(cpu hw events) at the 'out:' label regardless of whether the matching get cpu var() was called. If event->hw.idx is negative, the function jumps to the 'out:' label without executing get cpu var(), leading to an unmatched preempt enable() call. In kernels configured with CONFIG PREEMPT=y, this causes the preempt count to underflow, which can result in a 'scheduling while atomic' BUG.

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