CVE-2025-40288

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description The Linux kernel contains a flaw in the DRM/amdgpu subsystem related to VRAM logic for APU devices. A NULL pointer dereference could occur in ttm resource manager usage() on APU platforms and other scenarios with uninitialized VRAM managers. This happens because the man->bdev pointer within the resource manager remains uninitialized on APUs, leading to a kernel OOPS when attempting to acquire man->bdev->lru lock. The issue is addressed by checking if the resource manager is used via ttm resource manager used() before accessing potentially uninitialized members. Specifically, the fix involves modifications to amdgpu cs.c, amdgpu kms.c, and amdgpu virt.c to conditionally access VRAM-related data only when the manager is valid.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.