Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2025-9408

CVE-2025-9408HIGH

zephyrproject-rtos Zephyr — Userspace privilege escalation vulnerability on Cortex M

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   L   H   N   N  C  H  H  H    8.1   .0012    1.9     —

AFFECTED
  Product  Versions     Fixed
  Zephyr   unspecified  —

TIMELINE
  Aug 25  Reserved by zephyr
  Nov 11  Published (CNA: zephyr)
  Oct 13  RESCORED — CVE-2025-9408 (zephyrproject-rtos Zephyr). CVSS 8.2 → 8.1 (NVD).

CWE-270 · CNA: zephyr · CVSS v3.1 · 1 reference · NVD status: Deferred

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
August 25, 2025	Reserved	Reserved by zephyr
November 11, 2025	Published	Published (CNA: zephyr)
October 13, 2026	RESCORED	RESCORED — CVE-2025-9408 (zephyrproject-rtos Zephyr). CVSS 8.2 → 8.1 (NVD).

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
zephyrproject-rtos	Zephyr	—	—	—

Weaknesses

CWE-270

References (1)

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

Authoritative record: CVE-2025-9408 at cve.org

Vendors: zephyrproject-rtos

Weaknesses: CWE-270

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2025-9408 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.