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5.5

Linux kernel AMDGPU driver may return uninitialized data

CVE-2025-21987 · published 1 year ago
Summary

The AMDGPU graphics driver in the Linux kernel could send back data that was never set when certain memory regions are already cleared. This can lead to unpredictable behavior or expose internal information. Update the Linux kernel to the latest version that includes the fix.

What to do
  • Update linux kernel to version 6.13.6.
Affected software
Ecosystem VendorProductAffected versions
– linux linux_kernel >= 6.10, < 6.12.18
>= 6.13, < 6.13.6
6.14
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Linux linux kernel >= 6.13.0, < 6.13.6
Fix: upgrade to 6.13.6
Original advisory text
drm/amdgpu: init return value in amdgpu_ttm_clear_buffer
In the Linux kernel, the following vulnerability has been resolved:

drm/amdgpu: init return value in amdgpu_ttm_clear_buffer

Otherwise an uninitialized value can be returned if
amdgpu_res_cleared returns true for all regions.

Possibly closes: https://gitlab.freedesktop.org/drm/amd/-/issues/3812

(cherry picked from commit 7c62aacc3b452f73a1284198c81551035fac6d71)
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit (estimated)
  • Gives an attacker partial control (estimated)
Severity
5.5 Medium
Exploitation
<1% chance of attack within 30 days
Type
CWE-908Use of Uninitialized Resource
Timeline
Published2 Apr 2025
Updated30 Oct 2026
First seen7 Mar 2026
Sources
CVE-2025-21987 · NVD
CVE-2025-21987 · OSV
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