CVE-2026-5398

Kernel use-after-free bug in the TIOCNOTTY handler

State: Published
Severity: 8.4 High
Published: Apr 22, 2026
Updated: Apr 23, 2026
Reserved: Apr 2, 2026

Description

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 pointer to freed memory.

A malicious process can abuse the dangling pointer to grant itself root privileges.

Scores

CVSS	Score	Vector	Source
3.1	8.4 High	CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	CISA-ADP

Weaknesses

CWE-416 Use After Free

Affected Products

Product	Versions
FreeBSDFreeBSD	15.0-RELEASE to before p6Affected 14.4-RELEASE to before p2Affected 14.3-RELEASE to before p11Affected 13.5-RELEASE to before p12Affected

References

https://security.freebsd.org/advisories/FreeBSD-SA-26:10.tty.ascvendor-advisory

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