CVE-2026-43399 drm/amdgpu/userq: Fix reference leak in amdgpu_userq_wait_ioctl

What is CVE-2026-43399?

CVE-2026-43399 is a medium-severity memory corruption vulnerability in Linux kernel, published on 8 May 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/amdgpu/userq: Fix reference leak in amdgpu_userq_wait_ioctl

Drop reference to syncobj and timeline fence when aborting the ioctl due output array being too small.

(cherry picked from commit 68951e9c3e6bb22396bc42ef2359751c8315dd27)

Which versions are affected by CVE-2026-43399?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-43399?

Apply the vendor's patch.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-43399 being exploited?

There is no known exploitation of CVE-2026-43399 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BELL-CVE-2026-43399, DEBIAN-CVE-2026-43399, GHSA-wmw9-c68x-2mg9, UBUNTU-CVE-2026-43399.