CVE-2026-63873 accel/amdxdna: Fix mm_struct reference leak in aie2_populate_range()
A reference leak in the AMD XDNA accelerator driver allows local attackers to exhaust kernel memory, causing 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-2026-63873?
CVE-2026-63873 is a denial of service vulnerability in Linux, published on 19 Jul 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: Fix mm_struct reference leak in aie2_populate_range()
aie2_populate_range() jumps back to the again label without calling mmput(mm), leaking a reference to the mm_struct.
Add the missing mmput() before jumping to again.
Which versions are affected by CVE-2026-63873?
How do I fix CVE-2026-63873?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-63873 being exploited?
There is no known exploitation of CVE-2026-63873 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-63873, DEBIAN-CVE-2026-63873, GHSA-fcmf-5wqg-hrw5, UBUNTU-CVE-2026-63873.