CVE-2026-64073 irq_work: Fix use-after-free in irq_work_single() on PREEMPT_RT

In the Linux kernel, the following vulnerability has been resolved: irqwork: Fix use-after-free in irqworksingle on PREEMPTRT On PREEMPTRT, non-HARD irqwork runs in per-CPU kthreads via runirqworkd, so irqworksync uses rcuwait to wait for BUSY==0. After irqworksingle clears BUSY via atomiccmpxchg...

PT-2026-61390

In the Linux kernel, the following vulnerability has been resolved: irq work: Fix use-after-free in irq work single on PREEMPT RT On PREEMPT RT, non-HARD irq work runs in per-CPU kthreads via run irq workd, so irq work sync uses rcuwait to wait for BUSY==0. After irq work single clears BUSY via...