CVE-2026-89828

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

drm/amdgpu: Fix init ordering in amdgpu_vram_mgr_init()

drmm_cgroup_register_region() is called before INIT_LIST_HEAD() and

gpu_buddy_init() in amdgpu_vram_mgr_init(). If it fails, the function

returns early and bypasses those initializations.

Since adev->mman.initialized is set to true before amdgpu_vram_mgr_init()

is called, a failure triggers amdgpu_ttm_fini(), which calls

amdgpu_vram_mgr_fini(), which then:

- Calls list_for_each_entry_safe() on reservations_pending and

reserved_pages, whose list_head::next pointers are zero-initialized

(NULL). The loop does not recognize them as empty and dereferences NULL.

- Calls gpu_buddy_fini(), which iterates free_trees[] unconditionally

via for_each_free_tree(). Since mm->free_trees is NULL

(never allocated), this dereferences NULL.

Both result in a kernel panic on the module load error path.

Fix by moving drmm_cgroup_register_region() to after the list a

/// 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