CVE-2026-5398

High

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.

SeverityHigh

CVSS8.4

Exploit probability—

Product

Freebsd

PublishedApr 22, 2026

First seenApr 22, 2026

Weakness typeCWE-416Use after free

How to fix

Vendor advisories

security.freebsd.org/advisories/FreeBSD-SA-26:10.tty.asc

Affected products

Product	Affected versions	Fixed in
freebsd freebsd	13.5, 14.3, 14.4, 15.0	—

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