Race condition in Linux kernel - CVE-2026-46311

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Main Vulnerability Database Vulnerabilities #VU134189

Race condition in Linux kernel - CVE-2026-46311

Published: June 10, 2026


Vulnerability identifier: #VU134189
CSH Severity: Low
CVSS v4: 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]
CVE-ID: CVE-2026-46311
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

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.


Affected software

Linux kernel
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for x86_64
Ubuntu
linux (Ubuntu package)
linux-realtime (Ubuntu package)
linux-gcp (Ubuntu package)
linux-aws (Ubuntu package)
linux-oracle (Ubuntu package)
linux-azure (Ubuntu package)
linux-raspi (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-ibm (Ubuntu package)
linux-nvidia-bos (Ubuntu package)
linux-gcp-7.0 (Ubuntu package)
linux-azure-7.0 (Ubuntu package)
linux-oracle-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux-gke (Ubuntu package)
linux-azure-fde (Ubuntu package)
linux-nvidia-7.0 (Ubuntu package)
kernel (Red Hat package)

How to mitigate CVE-2026-46311

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - update to 7.0.0-28.28
linux-realtime (Ubuntu package) - update to 7.0.0-28.28.1
linux-gcp (Ubuntu package) - update to 7.0.0-1008.8
linux-aws (Ubuntu package) - update to 7.0.0-1009.9
linux-oracle (Ubuntu package) - update to 7.0.0-1008.8
linux-azure (Ubuntu package) - update to 7.0.0-1010.10
linux-raspi (Ubuntu package) - update to 7.0.0-1015.15
linux-nvidia (Ubuntu package) - update to 7.0.0-1016.16
linux-ibm (Ubuntu package) - update to 7.0.0-1010.10
linux-nvidia-bos (Ubuntu package) - update to 7.0.0-2016.16
linux-gcp-7.0 (Ubuntu package) - update to 7.0.0-1011.11~24.04.1
linux-azure-7.0 (Ubuntu package) - update to 7.0.0-1014.14~24.04.1
linux-oracle-7.0 (Ubuntu package) - update to 7.0.0-1011.11~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1009.9
linux-gke (Ubuntu package) - update to 7.0.0-1003.4
linux-azure-fde (Ubuntu package) - update to 7.0.0-1009.9
linux-nvidia-7.0 (Ubuntu package) - update to 7.0.0-1016.16~24.04.1
kernel (Red Hat package) - update to 5.14.0-687.52.1.el9_8

External References

Related Security Bulletins