What is CVE-2026-5398?

CVE-2026-5398 is a high-severity vulnerability in Freebsd, classified under Use After Free. CVSS score: 8.4/10. Published 2026-04-22.

How severe is CVE-2026-5398?

High severity. CVSS v3 base score is 8.4 out of 10.

Use After Free in Freebsd

CVE-2026-5398

The implementation of TIOCNOTTY failed to clear a back-pointer from the structure representing the controlling terminal to the calling process' session. If the invoking process then exits, the terminal structure may end up containing a po…

Vulnerability class: Use-After-Free

EPSS: 0.000 (1.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.4 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Freebsd — versions 14.3, 13.5, 15.0

Weakness classification (CWE)

CWE-416 — Use After Free

References

secteam@freebsd.org (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-5398?: CVE-2026-5398 is a high-severity vulnerability in Freebsd, classified under Use After Free. CVSS score: 8.4/10. Published 2026-04-22.
How severe is CVE-2026-5398?: High severity. CVSS v3 base score is 8.4 out of 10.