---
id: CVE-2026-90270
title: |-
  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…
summary: |-
  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…
severity: medium
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= f04046f2577a5c76167333ca99d3903ee5331ba0 <
    7d199b6a0651abad3ca6d0877dbedbe8fe6ea9e2
  - >-
    Linux >= f04046f2577a5c76167333ca99d3903ee5331ba0 <
    bb1a0f582d519c0461b0940116e2b52c5ba31459
  - Linux 6.19
published: '2026-09-17'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T17:17:23.573'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90270'
references:
  - url: 'https://git.kernel.org/stable/c/7d199b6a0651abad3ca6d0877dbedbe8fe6ea9e2'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/bb1a0f582d519c0461b0940116e2b52c5ba31459'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90270.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-90270'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2536363'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-90270'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90270'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-90270.mbox
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ingestedAt: '2026-09-17T16:21:47.838Z'
epss: 0.00198
epssPercentile: 0.09452
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe:
  - CWE-825
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9 · updated 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90270.json)