VulnerabilityUndergoing Analysis

CVE-2026-58093

An unprivileged local user can exploit this race condition to escalate privileges.

HIGH 7.0EPSS 0.09%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (0.09%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

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 3.1: 7.0 HIGHCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS: 0.09% probability · 1th percentile
CISA KEV: Not listed
Weakness: CWE-362, CWE-416
Source: secteam@freebsd.org

References

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

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.