CVE-2026-58093
Kernel use-after-free via tty ioctls
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.
INFO
Published Date :
Aug. 26, 2026, 5:33 a.m.
Last Modified :
Aug. 26, 2026, 5:33 a.m.
Remotely Exploit :
No
Source :
freebsd
Affected Products
The following products are affected by CVE-2026-58093
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Revalidate terminal state after acquiring tty lock.
- Ensure correct handling of concurrently destroyed terminals.
- Apply relevant system updates or patches.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-58093 vulnerability anywhere in the article.