Out-of-bounds write in Linux kernel - CVE-2026-68276

Vulnerability details

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

The vulnerability exists due to an out-of-bounds write in the cleaner shader sysfs path in amdgpu_gfx_run_cleaner_shader_job() when filling the shader IB buffer. A local user can trigger the cleaner shader sysfs path to overflow the allocated buffer and cause a denial of service.

The issue can result in a kernel page fault on GFX rings because a 16-dword IB allocation is overrun by writes based on an align_mask value of 0xff.

Affected software

How to mitigate CVE-2026-68276

External References

• https://git.kernel.org/stable/c/201633f47b542a99bb7baafdfcda7781249fb3d9
• https://git.kernel.org/stable/c/3e864bf2a32a1cbdf1e0f9c5a5a4176e8575f4a3
• https://git.kernel.org/stable/c/9cd9a983769a4d0e9cc80a287316ee79685d38b3
• https://git.kernel.org/stable/c/e28420e36542ae8b66a5bdcec419525f521bddf8

Related Security Bulletins

• Out-of-bounds write in Linux kernel amd amdgpu driver
• Debian update for linux