CVE-2026-58093 — HIGH (7.0)

Vulnerability 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.

CVSS Score

7.0

HIGH

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Related Weaknesses (CWE)

CWE-362 CWE-416

References

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

FAQ

What is CVE-2026-58093?

CVE-2026-58093 is a vulnerability with a CVSS score of 7.0 (HIGH). 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 t...

How severe is CVE-2026-58093?

CVE-2026-58093 has been rated HIGH with a CVSS base score of 7.0/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-58093?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.