CVE-2026-68103 drm/amdgpu: reject mapping a reserved doorbell to a new queue
A race condition in the AMD GPU driver allows overwriting queue mappings, potentially leading to privilege escalation or denial of service.
- 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-2026-68103?
CVE-2026-68103 is a high-severity vulnerability in Linux, published on 10 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/amdgpu: reject mapping a reserved doorbell to a new queue
When creating an user-queue, the user space provides a doorbell BO handle and an offset within the bo to obtain a doorbell.
However current implementation using xa_store_irq() to store a doorbell, which allows a later queue created with the same BO and offset parameters to overwrite an existing queue and doorbell mapping.
This can cause problems like misrouting fence IRQ processing to a wrong queue, and mislead the cleanup process of one queue erasing the mapping of another queue.
This commit fixes this issue by replacing xa_store_irq with xa_insert_irq, which rejects mapping a reserved doorbell to a newly created queue
(cherry picked from commit 6244eae22966350db52faf9c1369d3b2ffc5de4e)
Weakness: CWE-662
Which versions are affected by CVE-2026-68103?
How do I fix CVE-2026-68103?
Apply the vendor's patch.
Is CVE-2026-68103 being exploited?
There is no known exploitation of CVE-2026-68103 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-68103, DEBIAN-CVE-2026-68103, GHSA-wgx5-5x9q-wrw8, UBUNTU-CVE-2026-68103.