CVE-2025-9408

Userspace privilege escalation vulnerability on Cortex M

Published Nov 11, 2025 CVSS 3.1 · 8.2 High EPSS < 1% KEV · Not listed
Description
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

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Zephyrproject-rtos
Zephyrproject-rtos zephyr
Vendors & Products Zephyrproject-rtos
Zephyrproject-rtos zephyr
Type Values Removed Values Added
Description 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.
Title Userspace privilege escalation vulnerability on Cortex M
Weaknesses CWE-270
References
Metrics cvssV3_1

{'score': 8.2, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
zephyr
Published
Updated
Oct 13, 2026, 8:00 PM
Reserved
Aug 25, 2025, 6:44 AM
Status
Deferred
Published
Nov 11, 2025, 4:15 PM
Modified
Oct 18, 2026, 9:10 PM