EUVD-2026-18732Lifecycle Timeline
3Description
In the Linux kernel, the following vulnerability has been resolved: drm/xe: Open-code GGTT MMIO access protection GGTT MMIO access is currently protected by hotplug (drm_dev_enter), which works correctly when the driver loads successfully and is later unbound or unloaded. However, if driver load fails, this protection is insufficient because drm_dev_unplug() is never called. Additionally, devm release functions cannot guarantee that all BOs with GGTT mappings are destroyed before the GGTT MMIO region is removed, as some BOs may be freed asynchronously by worker threads. To address this, introduce an open-coded flag, protected by the GGTT lock, that guards GGTT MMIO access. The flag is cleared during the dev_fini_ggtt devm release function to ensure MMIO access is disabled once teardown begins. (cherry picked from commit 4f3a998a173b4325c2efd90bdadc6ccd3ad9a431)
Analysis
Linux kernel DRM/xe driver fails to protect GPU memory (GGTT) MMIO access during failed driver load or asynchronous buffer object teardown, potentially enabling information disclosure or memory corruption. The vulnerability affects systems with Intel Xe graphics where the driver's hotplug-based protection mechanism does not activate if initialization fails, leaving GGTT memory accessible after the driver should have been disabled. …
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