CVE-2026-46276
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.
Does this matter?
Lower severity and a low EPSS score (0.12%). Track it; it rarely justifies an emergency change on its own.
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 asserts if CONFIG_DRM_DEBUG_MM is enabled in the kernel config. This is apparently rarely enabled as these chips have been in the market for over a year and this issue was only reported now. Oops-Analysis: http://oops.fenrus.org/reports/bugzilla.korg/221376/report.html (cherry picked from commit 5719ce5865279cad4fd5f01011fe037168503f2d)
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.12% probability · 2th percentile
- CISA KEV
- Not listed
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/095a8b0ad3c3b5cdc3850d961adb8a8f735220bbPatch
- https://git.kernel.org/stable/c/0e21db1a77967bc15df662efdca8ea8a61d124eaPatch
- https://git.kernel.org/stable/c/1f5d33e7b0a9a2a140f46e22fb52eede323c5946Patch
- https://git.kernel.org/stable/c/30c000a49094ec568c9b51b7421f7a4a3f0b0298Patch
- https://git.kernel.org/stable/c/36f9602fb22ede69fcc8b422be0cf8105bf655adPatch
- https://git.kernel.org/stable/c/3e26c76891ab99fa173e9c501119fbb5c9f4600fPatch
- https://git.kernel.org/stable/c/9bc925759c05feae7dfa9570e77131d54729c8eaPatch
- https://git.kernel.org/stable/c/be0376affcafa0bbb371bb501579a825eae32281Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.