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.
References
| Link | Resource |
|---|---|
| https://security.freebsd.org/advisories/FreeBSD-SA-26:62.tty.asc | Vendor Advisory |
Configurations
Configuration 1 (hide)
|
History
24 Sep 2026, 13:25
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://security.freebsd.org/advisories/FreeBSD-SA-26:62.tty.asc - Vendor Advisory | |
| CPE | cpe:2.3:o:freebsd:freebsd:15.0:p8:*:*:*:*:*:* cpe:2.3:o:freebsd:freebsd:14.4:p6:*:*:*:*:*:* cpe:2.3:o:freebsd:freebsd:15.0:p4:*:*:*:*:*:* cpe:2.3:o:freebsd:freebsd:15.0:p6:*:*:*:*:*:* cpe:2.3:o:freebsd:freebsd:15.0:p9:*:*:*:*:*:* cpe:2.3:o:freebsd:freebsd:14.4:p5:*:*:*:*:*:* cpe:2.3:o:freebsd:freebsd:14.4:p1:*:*:*:*:*:* cpe:2.3:o:freebsd:freebsd:14.4:p8:*:*:*:*:*:* cpe:2.3:o:freebsd:freebsd:15.0:p10:*:*:*:*:*:* cpe:2.3:o:freebsd:freebsd:15.0:p12:*:*:*:*:*:* cpe:2.3:o:freebsd:freebsd:15.0:p2:*:*:*:*:*:* cpe:2.3:o:freebsd:freebsd:15.0:p1:*:*:*:*:*:* cpe:2.3:o:freebsd:freebsd:14.4:p4:*:*:*:*:*:* cpe:2.3:o:freebsd:freebsd:15.0:p11:*:*:*:*:*:* cpe:2.3:o:freebsd:freebsd:15.1:p1:*:*:*:*:*:* cpe:2.3:o:freebsd:freebsd:15.0:p5:*:*:*:*:*:* cpe:2.3:o:freebsd:freebsd:14.4:p2:*:*:*:*:*:* cpe:2.3:o:freebsd:freebsd:14.4:p7:*:*:*:*:*:* cpe:2.3:o:freebsd:freebsd:15.0:p3:*:*:*:*:*:* cpe:2.3:o:freebsd:freebsd:15.1:p2:*:*:*:*:*:* cpe:2.3:o:freebsd:freebsd:15.0:p7:*:*:*:*:*:* cpe:2.3:o:freebsd:freebsd:14.4:p3:*:*:*:*:*:* |
|
| First Time |
Freebsd
Freebsd freebsd |
Information
Published : 2026-08-26 06:16
Updated : 2026-09-24 13:25
NVD link : CVE-2026-58093
Mitre link : CVE-2026-58093
CVE.ORG link : CVE-2026-58093
JSON object : View
Products Affected
freebsd
- freebsd