CVE-2026-80626

In the Linux kernel, the following vulnerability has been resolved:

powerpc/perf: fix preempt count underflow in fsl_emb_pmu_del

fsl_emb_pmu_del() unconditionally calls put_cpu_var(cpu_hw_events) at

the 'out:' label, but only calls the matching get_cpu_var() after the

'i < 0' early-return check. When event->hw.idx is negative the

function jumps to 'out:' without having taken get_cpu_var(), and the

trailing put_cpu_var() then issues an unmatched preempt_enable(),

underflowing preempt_count.

On a CONFIG_PREEMPT=y kernel preempt_count would underflow and

eventually present as a 'scheduling while atomic' BUG.

Move put_cpu_var() to pair with get_cpu_var() so the percpu access is

correctly bracketed and the 'out:' label only handles perf_pmu_enable.