CVE-2026-90270

Not scored yetLast modified Oct 19, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

arm_mpam: Disable driver unbind to avoid UAF

When a user unbinds an MSC and that MSC is the only MSC left for a component then the corresponding mpam_component will be freed. If the user then goes on to read the schemata file in the resctrl filesystem then the mpam_component will be accessed from resctrl_arch_get_config() leading to a use after free.

As the MPAM driver is not a module the unbind sysfs interface is the only way to trigger the remove. Instead of dealing with the complexity of allowing some unused MSC to unbind just remove the unbind sysfs interface.

Metrics

No CVSS score has been published yet.

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

No affected versions have been published.

Timeline

Published
Sep 17, 2026
Last modified
Oct 19, 2026
NVD status
Received

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CVE-2026-90270: Unscored | Vulnix