{"id":"CVE-2025-9408","aliases":["EUVD-2025-84338","GHSA-3r6j-5mp3-75wr"],"status":"published","title":"Userspace privilege escalation vulnerability on Cortex M","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.","severity":{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00123,"percentile":0.02065,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-270"],"published":"2025-11-11T15:34:58Z","modified":"2026-10-28T02:30:23Z","products":[{"vendor":"zephyrproject-rtos","product":"zephyr"}],"references":[{"url":"https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-3r6j-5mp3-75wr","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/9xxx/CVE-2025-9408.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-9408","tags":["advisory"]},{"url":"https://github.com/zephyrproject-rtos/zephyr","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2025-9408","title":"Userspace privilege escalation vulnerability on Cortex M","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.","status":"published","published":"2025-11-11T15:34:58.719Z","modified":"2026-10-13T20:00:06.803Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-270"],"updated_at":"2026-11-02T14:32:33.755525Z"}],"euvd":[{"id":"EUVD-2025-84338","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.","status":"published","published":"2025-11-11T15:34:58Z","modified":"2026-10-13T20:00:06Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T17:27:18.769576Z"}],"nvd":[{"id":"CVE-2025-9408","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.","status":"published","published":"2025-11-11T16:15:40.917Z","modified":"2026-10-18T21:10:00.12Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-270"],"updated_at":"2026-11-02T14:11:43.650381Z"}],"osv":[{"id":"CVE-2025-9408","title":"Userspace privilege escalation vulnerability on Cortex M","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.","status":"published","published":"2025-11-11T15:34:58.719Z","modified":"2026-10-28T02:30:23.620353269Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-270"],"updated_at":"2026-11-02T15:44:53.490346Z"}]}}