Deadlock Risk in Linux Kernel's DRM/i915/GT Component

CVE-2025-21849

What is CVE-2025-21849?

A vulnerability exists in the Linux kernel's DRM/i915/GT component where improper use of spin_lock/unlock() in interrupt contexts can lead to a deadlock situation. When an interrupt is triggered while a lock is held, it may prevent further execution, jeopardizing system integrity. This issue has been addressed by implementing spin_lock_irqsave() to manage IRQ state correctly before acquiring locks. The fix enhances the overall robustness of the interrupt handling in the kernel, particularly in the signal_irq_work() execution path.

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