CVE-2025-38521 Information

Aug 17, 2025 cve

Description

In the Linux kernel the following vulnerability has been resolved:

drm/imagination: Fix kernel crash when hard resetting the GPU

The GPU hard reset sequence calls pm_runtime_force_suspend() and pm_runtime_force_resume() which according to their documentation should only be used during system-wide PM transitions to sleep states.

The main issue though is that depending on some internal runtime PM state as seen by pm_runtime_force_suspend() (whether the usage count is <= 1) pm_runtime_force_resume() might not resume the device unless needed. If that happens the runtime PM resume callback pvr_power_device_resume() is not called the GPU clocks are not re-enabled and the kernel crashes on the next attempt to access GPU registers as part of the power-on sequence.

Replace calls to pm_runtime_force_suspend() and pm_runtime_force_resume() with direct calls to the driver’s runtime PM callbacks pvr_power_device_suspend() and pvr_power_device_resume() to ensure clocks are re-enabled and avoid the kernel crash.

Reference

https://git.kernel.org/stable/c/9f852d301f642223c4798f3c13ba15e91165d078 https://git.kernel.org/stable/c/d38376b3ee48d073c64e75e150510d7e6b4b04f7 https://git.kernel.org/stable/c/e066cc6e0f094ca2120f1928d126d56f686cd73e

CNNVD-202508-1939 (Published: 2025-08-16)

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