CVE-2026-46276

/// Technical description

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

drm/amdgpu: fix zero-size GDS range init on RDNA4

RDNA4 (GFX 12) hardware removes the GDS, GWS, and OA on-chip memory

resources. The gfx_v12_0 initialisation code correctly leaves

adev->gds.gds_size, adev->gds.gws_size, and adev->gds.oa_size at

zero to reflect this.

amdgpu_ttm_init() unconditionally calls amdgpu_ttm_init_on_chip() for

each of these resources regardless of size. When the size is zero,

amdgpu_ttm_init_on_chip() forwards the call to ttm_range_man_init(),

which calls drm_mm_init(mm, 0, 0). drm_mm_init() immediately fires

DRM_MM_BUG_ON(start + size <= start) -- trivially true when size is

zero -- crashing the kernel during modprobe of amdgpu on an RX 9070 XT.

Guard against this by returning 0 early from

amdgpu_ttm_init_on_chip() when size_in_page is zero. This skips TTM

resource manager registration for hardware resources that are absent,

without affecting any other GPU type.

DRM_MM_BUG_ON() only asser

/// 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