CVE-2026-89808 drm/amdkfd: Fix the case that vm range is hole at svm_migrate_copy_to_vram
A flaw in the Linux kernel's AMD GPU driver allows a local attacker to cause a denial of service by triggering an uninitialized variable usage during memory migration.
- 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-2026-89808?
CVE-2026-89808 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/amdkfd: Fix the case that vm range is hole at svm_migrate_copy_to_vram
When migration vm range is hole at cpu side(MIGRATE_PFN_MIGRATE set + MIGRATE_PFN_VALID unset) driver still allocates device pages. There is no dma map of src pages and migration. j is 0 and svm_migrate_copy_memory_gart() will return an uninitialized r. That can trigger out_free_vram_pages to drop all VRAM just set up.
Initialize r and only call the last svm_migrate_copy_memory_gart if j > 0.
Current code postponed the last page to the final copy. This patch flushes on the last page when reach to the end of current drm_buddy_block; avoids another svm_migrate_copy_memory_gart.
Which versions are affected by CVE-2026-89808?
How do I fix CVE-2026-89808?
Apply the vendor's patch.
Is CVE-2026-89808 being exploited?
There is no known exploitation of CVE-2026-89808 in the wild and no public exploit code.
Sources
Also known as AZL-101415, BELL-CVE-2026-89808, DEBIAN-CVE-2026-89808, GHSA-r66w-v4mr-3pxg, UBUNTU-CVE-2026-89808.