How severe is CVE-2025-9408?

CVE-2025-9408 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over local access with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-9408 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-9408?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-9408 have an EU (EUVD) identifier?

Yes. CVE-2025-9408 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-84338.

When was CVE-2025-9408 published?

CVE-2025-9408 was published on 2025-11-11 and last updated on 2026-06-17.

CVE-2025-9408

CVE-2025-9408 is a high-severity vulnerability with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-270.

Key facts

Severity: High (CVSS 3.x base score 8.1)
EPSS exploit prediction: 0% (1st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-84338
Weakness: CWE-270
Published: 2025-11-11
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2025-9408?: CVE-2025-9408 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over local access with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-9408 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-9408?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-9408 have an EU (EUVD) identifier?: Yes. CVE-2025-9408 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-84338.
When was CVE-2025-9408 published?: CVE-2025-9408 was published on 2025-11-11 and last updated on 2026-06-17.

References

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

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