Linux Kernel Runtime Power Management Vulnerability in DRM/xe CCS Mode Store

A vulnerability in the Linux kernel's DRM/xe graphics driver has been addressed. The issue involved a missing runtime power management reference in the 'ccs_mode_store' function, which is responsible for setting compute modes. This function called 'xe_gt_reset', triggering 'xe_pm_runtime_get_noresume' without the necessary outer runtime PM reference, leading to a warning about the missing protection. The vulnerability has been fixed by adding the appropriate scope-based guard to ensure proper runtime PM management.

Impact

The vulnerability could lead to improper power management, potentially causing performance issues or unintended behavior in the graphics driver.

Remediation

Users can apply the latest patch available in the Linux kernel stable tree to address this vulnerability.