🛡️ CVE-2026-46276 — kernel

🟡 CVSS 5.5 — Medium ✅ No Known Exploit NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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

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)

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Affected software

CVE-2026-46276 is recorded against 3 packages.

  • kernel (from 6.19.0 up to 7.0.4)
  • linux-kernel
  • unknown

Timeline and source

Published on 8 June 2026 and last revised on 25 July 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2026-46276 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Medium
CVSS Score 5.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2026-06-08
Updated 2026-08-12
Modified 2026-07-25

Affected Packages

Software From version Fixed in
kernel 6.19.0 7.0.4
linux-kernel — —
unknown — —

References

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