CVE-2026-90271 arm_mpam: Fix a NULL pointer dereference on unbinding after an error interrupt
A local attacker can cause a kernel crash by unbinding an MSC device after an error interrupt, leading to a 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-2026-90271?
CVE-2026-90271 is a vulnerability in Linux, published on 17 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:
arm_mpam: Fix a NULL pointer dereference on unbinding after an error interrupt
If a user unbinds an MSC after mpam_disable() has been run in response to an error interrupt then a dereference of a NULL pointer occurs as mpam_disable() sets the drvdata to NULL. Add an early return to the driver remove callback to avoid this.
Which versions are affected by CVE-2026-90271?
How do I fix CVE-2026-90271?
Apply the vendor's patch.
Is CVE-2026-90271 being exploited?
There is no known exploitation of CVE-2026-90271 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-90271, GHSA-p39c-xj5c-vgmf, UBUNTU-CVE-2026-90271.