CVE-2025-38521

/// Technical 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

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References