CVE-2026-53326

Summary

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

debugobjects: Don't call fill_pool() in early boot hardirq context

When booting a debug PREEMPT_RT kernel on an ARM64 system, a "inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage" lockdep warning message was reported to the console.

During early boot, interrupts are enabled before the scheduler is enabled. In this window (before SYSTEM_SCHEDULING is set) interrupts can fire and in the hard interrupt context handler attempt to fill the pool

This can lead to a deadlock when the interrupt occurred when the interrupt hits a region which holds a lock that is required to be taken in the allocation path.

Add a new can_fill_pool() helper and reorder the exception rule and forbid this scenario by excluding allocations from hard interrupt context.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/3cc90ea0dd0fb1f8db577dcdc027fc46c06049f6
• https://git.kernel.org/stable/c/5d95f6b267f3d7fe54f42a3b224bb4a3d3990b41
• https://git.kernel.org/stable/c/27335c50014102e9077b784ebd314954286afcab
• https://git.kernel.org/stable/c/44b8b03a9fb5c575548fc72c674653d6baba142a
• https://git.kernel.org/stable/c/7bc71bdb1c1526c7f02a6adab324394ff1327b0a
• https://git.kernel.org/stable/c/0d046ae106255cba5eb83b23f78ee93f3620247d

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