The Linux kernel suffers a race condition between the ioctl or release handlers in the pseries/papr-hvpipe module and an interrupt that fires on the same CPU. When both paths execute without raising interrupts, they compete for the same lock and can block each other indefinitely, producing a deadlock that stalls the CPU and can render the system unresponsive. The patched kernel replaces the conflicting lock usage with spin_lock_irq{save,restore} variants, ensuring that the interrupt disables are held during critical sections and the race is eliminated.

The vulnerability exists in the generic Linux kernel for pseries platforms; no specific kernel versions are listed, so any build lacking the patch is potentially affected. The advisory does not provide granular version or patch level information.

The flaw represents a local denial‑of‑service risk. Because the issue hinges on a kernel race triggered by the kernel’s own interrupt handling, it requires local privileged code or an existing kernel exploit that causes the ioctl or release paths to execute. The advisory lists no EPSS score and the vulnerability is not present in the CISA KEV catalog, suggesting that no widespread exploitation has been observed. The impact is high if the deadlock occurs, but the probability of exploitation is inferred to be low and limited to environments where the vulnerable module is loaded.