What’s Vulnerable › Vulnerabilities
CVE-2026-58093: Kernel use-after-free via tty ioctls
- Severity: high (CVSS 7.0 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.1% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-08-26 · updated 2026-09-24
- Weakness: CWE-362
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: 14.4-p1, 14.4-p2, 14.4-p3, 14.4-p4, 14.4-p5, 14.4-p6 (+16)
In the news
- ZDI-26-838: FreeBSD Kernel TTY Race Condition Local Privilege Escalation Vulnerability
- ZDI-26-784: FreeBSD Kernel kqueue Use-After-Free Local Privilege Escalation Vulnerability
References
Get alerted when CVE-2026-58093 or the next vulnerability affects your stack