The vulnerability involves the Linux kernel debugobjects feature on ARM64 systems with a debug PREEMPT_RT kernel. During early boot, interrupts are enabled before the scheduler, allowing interrupts to occur in a hard interrupt context where fill_pool() is called. This can cause a deadlock if the interrupt handler attempts to allocate memory while holding a lock required for allocation. The fix introduced a can_fill_pool() helper and reordered exception rules to forbid allocations from hard interrupt context during early boot, preventing the deadlock scenario.

This vulnerability can cause a deadlock during early boot on affected ARM64 Linux systems running debug PREEMPT_RT kernels. The deadlock arises from improper memory allocation in hard interrupt context, potentially halting system boot or causing instability. There are no known exploits in the wild. The impact is limited to specific kernel configurations and early boot scenarios.

A fix has been implemented in the Linux kernel to prevent fill_pool() calls in hard interrupt context during early boot by adding a can_fill_pool() helper and adjusting exception rules. Users should update to the fixed kernel version once available. Patch status is not yet confirmed; check the official Linux kernel advisories or vendor updates for current remediation guidance.