CVE-2018-18386: Canonical Ubuntu Linux

Low severity, CVSS 3.3. EPSS: 0.4% chance of exploitation in the next 30 days.

drivers/tty/n_tty.c in the Linux kernel before 4.14.11 allows local attackers (who are able to access pseudo terminals) to hang/block further usage of any pseudo terminal devices due to an EXTPROC versus ICANON confusion in TIOCINQ.

Affected products

• Canonical Ubuntu Linux: version 12.04 only; version 14.04 only
• Linux Linux Kernel: before 4.14.11 (fixed in 4.14.11)

Published 2018-10-17. Last modified 2026-06-17.