CVE-2026-90271: arm_mpam: Fix a NULL pointer dereference on unbinding after an error interrupt

Severity: unknown
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-17 · updated 2026-10-19

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.

Affected products

Linux kernel: 6.19 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

https://git.kernel.org/stable/c/a29044c9c83513c7463de2adb84c169685562ad2
https://git.kernel.org/stable/c/fc996c39689bb15aa80e5366809434f7258fb703

Get alerted when CVE-2026-90271 or the next vulnerability affects your stack