CVE-2026-68303 drm/vc4: hvs/v3d: Fix null dereference in unbind
A null pointer dereference in the Linux kernel's vc4 DRM drivers during unbind can cause a system crash, requiring a kernel patch.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-68303?
CVE-2026-68303 is a vulnerability in Linux, published on 10 Aug 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/vc4: hvs/v3d: Fix null dereference in unbind
The hvs and v3d drivers use dev_get_drvdata(master) in their unbind functions. Since the vc4-drm gets removed before its dependent drivers (vc4_hvs/vc4_v3d) the vc4_hvs_unbind/vc4_v3d_unbind functions try to get drvdata of its master and fails with a null dereference error.
Use the data pointer passed to the unbind functions directly instead of dev_get_drvdata(master). This avoids using potentially freed memory.
Which versions are affected by CVE-2026-68303?
How do I fix CVE-2026-68303?
Apply the vendor's patch.
Is CVE-2026-68303 being exploited?
There is no known exploitation of CVE-2026-68303 in the wild and no public exploit code.
Sources
Also known as AZL-95024, BELL-CVE-2026-68303, DEBIAN-CVE-2026-68303, GHSA-mgwq-5fv3-97fj, UBUNTU-CVE-2026-68303.