SB20260812433 - Time-of-check Time-of-use (TOCTOU) Race Condition in Linux kernel amd amdgpu driver

Description

This security bulletin contains information about 1 vulnerability.

1) Time-of-check Time-of-use (TOCTOU) Race Condition (CVE-ID: CVE-2026-68107)

CWE-ID: CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition

CVSSv4: 6.8 [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]

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

The vulnerability exists due to a time-of-check time-of-use race condition in the amdgpu vcn_v4_0 command submission handling in drivers/gpu/drm/amd/amdgpu/vcn_v4_0.c when processing an indirect buffer. A local user can modify the indirect buffer between reads to cause a denial of service.

The issue affects the VCN4 encoding parameter parsing path.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/3b4082fabc67c9780b06eb959e59dd92fa79c0f0
• https://git.kernel.org/stable/c/bbbe6a2a8d8dc87243438d3ffea2083b52d882d9
• https://git.kernel.org/stable/c/bd868c077f67589ed2a714307ceaade5f246e302
• https://git.kernel.org/stable/c/c309626bf91fa0a0b583575654e6e14e81f818a3
• https://git.kernel.org/stable/c/ff6aa542d91d76a185f69bd1997b94a560ff5f6b