CVE-2026-58093

High

Description

The TIOCSCTTY ioctl handler drops the tty lock in order to acquire the process tree lock. After reacquiring the tty lock, the handler did not revalidate the state of the terminal, and could proceed to link a terminal that was concurrently being destroyed to the calling process' session. An unprivileged local user can exploit this race condition to escalate privileges.

SeverityHigh

CVSS7.0

Exploit probability—

Product

Freebsd

PublishedAug 26, 2026

First seenAug 26, 2026

Weakness typeCWE-362Race condition CWE-416Use after free

How to fix

Vendor advisories

security.freebsd.org/advisories/FreeBSD-SA-26:62.tty.asc

Affected products

Product	Affected versions	Fixed in
freebsd freebsd	14.4, 15.0, 15.1	—

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