arm_mpam: Fix a NULL pointer dereference on unbinding after an error interrupt (CVE-2026-90271) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-90271

arm_mpam: Fix a NULL pointer dereference on unbinding after an error interrupt

Answer in brief

CVE-2026-90271 records a Unknown severity vulnerability in arm_mpam: Fix a NULL pointer dereference on unbinding after an error interrupt. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 17, 2026Updated Sep 17, 2026Source checked Sep 17, 2026First seen by HOL Sep 17, 2026Material review Sep 17, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=f04046f2577a5c76167333ca99d3903ee5331ba0 <a29044c9c83513c7463de2adb84c169685562ad2 \|\| >=f04046f2577a5c76167333ca99d3903ee5331ba0 <fc996c39689bb15aa80e5366809434f7258fb703	a29044c9c83513c7463de2adb84c169685562ad2, fc996c39689bb15aa80e5366809434f7258fb703
Linux/Linuxgeneric	6.19	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to a29044c9c83513c7463de2adb84c169685562ad2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 17, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.