CVE-2026-58093 — Kernel use-after-free via tty ioctls
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 termin…
Published: 2026-08-26 · CVSS: 7.0 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7