SB2026061029 - Race condition in Linux kernel amd amdgpu driver

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-46311)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper locking in drm/amdgpu user queue handling in drivers/gpu/drm/amd/amdgpu/mes_userqueue.c when creating a user queue and accessing the wptr mapping. A local user can trigger queue creation while unmapping the wptr object and reusing another buffer object at the same address to cause a denial of service.

The issue involves stale wptr mapping access during queue creation.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/336a9186f3a4b65bbd865d93936605ac8a1a3991
• https://git.kernel.org/stable/c/6da7b1242da4455b11c24ce667d1cab1a348c8ea