# CVE-2026-58093

## Summary

- **CVE ID:** CVE-2026-58093
- **Severity:** HIGH
- **CVSS Score:** 7 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** CWE-362, CWE-416
- **Published:** Aug 26, 2026
- **Last Modified:** Aug 27, 2026

## 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.

## Affected Products

- FreeBSD — FreeBSD (15.1-RELEASE)
- FreeBSD — FreeBSD (15.0-RELEASE)
- FreeBSD — FreeBSD (14.4-RELEASE)

## References

- [CNA](https://security.freebsd.org/advisories/FreeBSD-SA-26:60.tty.asc)
- [CNA](https://security.freebsd.org/advisories/FreeBSD-SA-26:62.tty.asc)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.09%
- **EPSS Percentile:** 0.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._