CVE-2026-89826 drm/panthor: harden firmware build-info bounds checks
Integer overflow in Panthor GPU driver allows bypassing bounds checks, potentially leading to out-of-bounds reads and code execution.
- 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-2026-89826?
CVE-2026-89826 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: harden firmware build-info bounds checks
panthor_fw_read_build_info() checks whether the metadata range fits in the firmware image with hdr.meta_start + hdr.meta_size. Both fields are u32, so the addition can wrap and let an out-of-bounds range pass validation.
The function also reads the "git_sha: " prefix without first checking that the metadata is long enough, and meta_size == 0 can underflow the NULL terminator index.
Use subtraction-based bounds checking and reject metadata that is too short to contain the expected prefix and trailing NULL byte.
Which versions are affected by CVE-2026-89826?
How do I fix CVE-2026-89826?
Apply the vendor's patch.
Is CVE-2026-89826 being exploited?
There is no known exploitation of CVE-2026-89826 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-89826, DEBIAN-CVE-2026-89826, GHSA-vfmm-vgxh-2c77, UBUNTU-CVE-2026-89826.