CVE-2026-53139 drm/v3d: Skip CSD when it has zeroed workgroups

Medium 5.5 Published 25 Jun 2026 Updated 4 Jul 2026

A local attacker can cause a denial of service by submitting a compute shader dispatch with zeroed workgroup counts, leading to unexpected hardware behavior.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: Available

What is CVE-2026-53139?

CVE-2026-53139 is a medium-severity denial of service vulnerability in Linux kernel, published on 25 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In the Linux kernel, the following vulnerability has been resolved:

drm/v3d: Skip CSD when it has zeroed workgroups

A compute shader dispatch encodes its workgroup counts in the CFG0..CFG2 registers. Kicking off a dispatch with a zero count in any of the three dimensions is invalid. First, the hardware will process 0 as 65536, while the user-space driver exposes a maximum of 65535. Over that, a submission with a zeroed workgroup dimension should be a no-op.

These zeroed counts can reach the dispatch path through an indirect CSD job, whose workgroup counts are only known once the indirect buffer is read and may legitimately be zero, but such scenario should only result in a no-op.

Overwrite the indirect CSD job workgroup counts with the indirect BO ones, even if they are zeroed, and don't submit the job to the hardware when any of the workgroup counts is zero, so the job completes immediately instead of running the shader.

Which versions are affected by CVE-2026-53139?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-53139?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-53139 being exploited?

There is no known exploitation of CVE-2026-53139 in the wild and no public exploit code.

All Linux kernel vulnerabilities

Sources

Also known as BELL-CVE-2026-53139, DEBIAN-CVE-2026-53139, GHSA-qcxp-rj5j-4rr9, ROOT-OS-DEBIAN-11-CVE-2026-53139, ROOT-OS-DEBIAN-12-CVE-2026-53139, ROOT-OS-DEBIAN-13-CVE-2026-53139 and 3 more.