Linux i915 GPU kernel driver (display page table objects): The buffer object backing a display page table

Impact

The buffer object backing a display page table was not treated as a framebuffer, letting it be moved or reused while the display engine still pointed at it. Practical outcome on a headless GPU node is a driver crash rather than a tenant boundary break, but on nodes that do run display output it can surface other memory on screen.

Who can reach it

Any local user or container with a DRM render node - i.e. any tenant that was scheduled a GPU. No privileged capability needed.

What to do

Fix ships in the Linux kernel. Update the kernel and reboot the node - in practice this is a drain plus reboot because the accelerator driver cannot be unloaded while jobs hold device file descriptors. No BIOS or firmware update needed.

References