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.
https://usn.ubuntu.com/3849-2/
https://usn.ubuntu.com/3849-1/
https://github.com/torvalds/linux/commit/966031f340185eddd05affcf72b740549f056348
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.11
https://bugzilla.suse.com/show_bug.cgi?id=1094825
https://access.redhat.com/errata/RHSA-2019:0831
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=966031f340185eddd05affcf72b740549f056348
Source: Mitre, NVD
Published: 2018-10-17
Updated: 2024-11-21
Base Score: 2.1
Vector: CVSS2#AV:L/AC:L/Au:N/C:N/I:N/A:P
Severity: Low
Base Score: 3.3
Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
EPSS: 0.00089