Riskcovery

CVE-2026-90270

arm_mpam: Disable driver unbind to avoid UAF

State
Published
Severity
Not scored
Published
Sep 17, 2026
Updated
Oct 19, 2026
Reserved
Sep 11, 2026

Read the record on cve.org

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • f04046f2577a5c76167333ca99d3903ee5331ba0 to before 7d199b6a0651abad3ca6d0877dbedbe8fe6ea9e2Affected
  • f04046f2577a5c76167333ca99d3903ee5331ba0 to before bb1a0f582d519c0461b0940116e2b52c5ba31459Affected
LinuxLinux
  • 6.19Affected
  • before 6.19Not affected
  • 7.2.6 through 7.2.*Not affected
  • 7.3 and laterNot affected

References

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