CVE-2026-80657 accel/amdxdna: Guard management mailbox channel cleanup against NULL pointer
A local attacker can cause a denial of service in the Linux kernel by triggering a NULL pointer dereference in the AMD XDNA driver cleanup path.
- 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-2026-80657?
CVE-2026-80657 is a vulnerability in Linux, published on 28 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:
accel/amdxdna: Guard management mailbox channel cleanup against NULL pointer
The management mailbox channel cleanup helpers can be called from error handling paths when mgmt_chann has already been destroyed.
Add NULL checks to xdna_mailbox_free_channel() and xdna_mailbox_stop_channel() so the cleanup path safely returns instead of dereferencing a NULL mailbox channel pointer.
Which versions are affected by CVE-2026-80657?
How do I fix CVE-2026-80657?
Apply the vendor's patch.
Is CVE-2026-80657 being exploited?
There is no known exploitation of CVE-2026-80657 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-80657, DEBIAN-CVE-2026-80657, GHSA-hwpp-gg7q-6q46, UBUNTU-CVE-2026-80657.