CVE-2025-21849

Summary

CVE-2025-21849 is a vulnerability in the Linux kernel that impacts the drm/i915/gt driver. This issue arises when spin_lock/unlock functions are used in interrupt contexts, potentially resulting in a deadlock. To address this problem, the Linux kernel team has implemented several fixes. First, they save irq state before spin lock acquisition. Second, they add irqs' state save/restore calls to all locks/unlocks in signal_irq_work(). Lastly, they use spin_lock_irqsave() in guc_lrc_desc_unpin() instead of other lock/unlock calls. These changes mitigate the risk of deadlocks caused by interrupts coming in while holding a lock.

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