CVE-2026-80582 drm/shmem_helper: Check VMA boundaries for PMD mappings
A missing boundary check in the Linux kernel DRM shmem helper allows installing invalid PMD mappings, potentially causing system crashes or 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-2026-80582?
CVE-2026-80582 is a high-severity memory corruption vulnerability in Linux, published on 26 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/shmem_helper: Check VMA boundaries for PMD mappings
In the ->huge_fault handler do not install a PMD huge page mapping if the huge page exceeds the boundaries of the VMA.
All other ->huge_fault handlers have similar checks and the resulting mapping will trigger a VM_BUG_ON_VMA() if it ever reaches copy_pmd_range().
Which versions are affected by CVE-2026-80582?
How do I fix CVE-2026-80582?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-80582 being exploited?
There is no known exploitation of CVE-2026-80582 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-80582, GHSA-8m43-m8xf-jm3h, UBUNTU-CVE-2026-80582.