CVE-2026-93284 drm/pagemap: dma-unmap pages before handling migration errors
A null pointer dereference in the Linux kernel DRM pagemap code can cause a system crash when migration errors occur.
- 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-2026-93284?
CVE-2026-93284 is a high-severity vulnerability in Linux, published on 24 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/pagemap: dma-unmap pages before handling migration errors
drm_pagemap_migrate_unmap_pages() relies on the pages array to determine which pages require DMA unmapping. However, drm_pagemap_migration_unlock_put_pages() clears the array as part of its cleanup, leaving drm_pagemap_migrate_unmap_pages() with no valid page information if it is called afterward.
Call drm_pagemap_migrate_unmap_pages() before drm_pagemap_migration_unlock_put_pages() so the pages array remains valid during DMA unmapping.
Which versions are affected by CVE-2026-93284?
How do I fix CVE-2026-93284?
Apply the vendor's patch.
Is CVE-2026-93284 being exploited?
There is no known exploitation of CVE-2026-93284 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-93284, DEBIAN-CVE-2026-93284, GHSA-9hg7-4qcp-5vr8, UBUNTU-CVE-2026-93284.