---
id: CVE-2025-9408
title: >-
  System call entry on Cortex M (and possibly R and A, but I think not) has a
  race which allows very practical privilege escalation for malicious userspace
  processes.
summary: >-
  System call entry on Cortex M (and possibly R and A, but I think not) has a
  race which allows very practical privilege escalation for malicious userspace
  processes.
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H'
cwe:
  - CWE-270
published: '2025-11-11'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T20:17:01.173'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-9408'
references:
  - url: >-
      https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-3r6j-5mp3-75wr
    label: vulnerabilities@zephyrproject.org
tags:
  - nvd
epss: 0.00123
epssPercentile: 0.01841
ingestedAt: '2026-10-13T20:53:44.534Z'
---

## Overview

System call entry on Cortex M (and possibly R and A, but I think not) has a race which allows very practical privilege escalation for malicious userspace processes.

## Remediation

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