What is CVE-2025-9408?

CVE-2025-9408 is a high-severity vulnerability in Zephyrproject-rtos Zephyr, classified under Privilege Context Switching Error. CVSS score: 8.2/10. Published 2025-11-11.

How severe is CVE-2025-9408?

High severity. CVSS v3 base score is 8.2 out of 10.

Vulnerability in Zephyrproject-rtos Zephyr

CVE-2025-9408

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.

EPSS: 0.000 (2.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H.

Affected products

Zephyrproject-rtos Zephyr

Weakness classification (CWE)

CWE-270 — Privilege Context Switching Error

References

github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-3r6j-5mp3-75wr

Frequently asked questions

What is CVE-2025-9408?: CVE-2025-9408 is a high-severity vulnerability in Zephyrproject-rtos Zephyr, classified under Privilege Context Switching Error. CVSS score: 8.2/10. Published 2025-11-11.
How severe is CVE-2025-9408?: High severity. CVSS v3 base score is 8.2 out of 10.