CVE-2026-53326

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> debugobjects: Don&amp;#39;t call fill_pool() in early boot hardirq context<br /> <br /> When booting a debug PREEMPT_RT kernel on an ARM64 system, a "inconsistent<br /> {HARDIRQ-ON-W} -&gt; {IN-HARDIRQ-W} usage" lockdep warning message was<br /> reported to the console.<br /> <br /> During early boot, interrupts are enabled before the scheduler is<br /> enabled. In this window (before SYSTEM_SCHEDULING is set) interrupts can<br /> fire and in the hard interrupt context handler attempt to fill the pool<br /> <br /> This can lead to a deadlock when the interrupt occurred when the interrupt<br /> hits a region which holds a lock that is required to be taken in the<br /> allocation path.<br /> <br /> Add a new can_fill_pool() helper and reorder the exception rule and forbid<br /> this scenario by excluding allocations from hard interrupt context.