CVE-2026-23466 drm/xe: Open-code GGTT MMIO access protection
A race condition in the Linux kernel's Xe GPU driver can cause a denial of service if driver load fails, requiring a kernel patch.
- 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-2026-23466?
CVE-2026-23466 is a high-severity vulnerability in Linux kernel, published on 3 Apr 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/xe: Open-code GGTT MMIO access protection
GGTT MMIO access is currently protected by hotplug (drm_dev_enter), which works correctly when the driver loads successfully and is later unbound or unloaded. However, if driver load fails, this protection is insufficient because drm_dev_unplug() is never called.
Additionally, devm release functions cannot guarantee that all BOs with GGTT mappings are destroyed before the GGTT MMIO region is removed, as some BOs may be freed asynchronously by worker threads.
To address this, introduce an open-coded flag, protected by the GGTT lock, that guards GGTT MMIO access. The flag is cleared during the dev_fini_ggtt devm release function to ensure MMIO access is disabled once teardown begins.
(cherry picked from commit 4f3a998a173b4325c2efd90bdadc6ccd3ad9a431)
Weakness: CWE-362
Which versions are affected by CVE-2026-23466?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-23466?
Apply the vendor's patch.
Is CVE-2026-23466 being exploited?
There is no known exploitation of CVE-2026-23466 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-23466, DEBIAN-CVE-2026-23466, GHSA-92cv-r3f2-hrpf, ROOT-OS-DEBIAN-13-CVE-2026-23466, UBUNTU-CVE-2026-23466.