CVE-2025-21849 Information

Description

In the Linux kernel the following vulnerability has been resolved:

drm/i915/gt: Use spin_lock_irqsave() in interruptible context

spin_lock/unlock() functions used in interrupt contexts could result in a deadlock as seen in GitLab issue 13399 which occurs when interrupt comes in while holding a lock.

Try to remedy the problem by saving irq state before spin lock acquisition.

v2: add irqs’ state save/restore calls to all locks/unlocks in signal_irq_work() execution (Maciej)

v3: use with spin_lock_irqsave() in guc_lrc_desc_unpin() instead of other lock/unlock calls and add Fixes and Cc tags (Tvrtko); change title and commit message

(cherry picked from commit c088387ddd6482b40f21ccf23db1125e8fa4af7e)

Reference

https://git.kernel.org/stable/c/2bf1f4c129db7a10920655b000f0292f1ee509c2 https://git.kernel.org/stable/c/47ae46ac5407646420e06b78e0dad331e56a4bb4 https://git.kernel.org/stable/c/e49477f7f78598295551d486ecc7f020d796432e