CVE-2026-89825 drm/panthor: fix firmware control interface bounds checks
Integer overflow in Panthor GPU driver allows bypassing bounds checks, potentially leading to memory corruption and privilege escalation.
- 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-2026-89825?
CVE-2026-89825 is a high-severity vulnerability in Linux, published on 16 Sep 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/panthor: fix firmware control interface bounds checks
panthor_init_cs_iface() and panthor_init_csg_iface() validate firmware control interface offsets with 32-bit arithmetic and the size of the host wrapper structures. The offsets are derived from firmware-provided strides, so the arithmetic can wrap before the bounds check, and the host wrapper size is not the size of the firmware control interface being mapped.
Use 64-bit arithmetic for the computed offsets and validate against the actual firmware control interface structure sizes with subtraction-based bounds checks. Also validate that the shared section is large enough for the global control interface before using it.
Which versions are affected by CVE-2026-89825?
How do I fix CVE-2026-89825?
Apply the vendor's patch.
Is CVE-2026-89825 being exploited?
There is no known exploitation of CVE-2026-89825 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-89825, DEBIAN-CVE-2026-89825, GHSA-rf43-g6fv-p7qg, UBUNTU-CVE-2026-89825.