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CVE-2018-18386

Published: 17 October 2018

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.

From the Ubuntu Security Team

Tetsuo Handa discovered a logic error in the TTY subsystem of the Linux kernel. A local attacker with access to pseudo terminal devices could use this to cause a denial of service.

Priority

Medium

Cvss 3 Severity Score

3.3

Score breakdown

Status

Package Release Status
linux-snapdragon
Launchpad, Ubuntu, Debian
xenial
Released (4.4.0-1088.93)
bionic Not vulnerable

cosmic Does not exist

trusty Does not exist

upstream
Released (4.15~rc6)
linux
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-10.11)
cosmic Not vulnerable
(4.15.0-20.21)
trusty
Released (3.13.0-164.214)
upstream
Released (4.15~rc6)
xenial
Released (4.4.0-119.143)
Patches:
Introduced by

26df6d13406d1a53b0bda08bd712f1924affd7cd

Fixed by 966031f340185eddd05affcf72b740549f056348
linux-flo
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (4.15~rc6)
xenial Ignored
(abandoned)
linux-aws
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1001.1)
cosmic Not vulnerable
(4.15.0-1007.7)
trusty
Released (4.4.0-1016.16)
upstream
Released (4.15~rc6)
xenial
Released (4.4.0-1054.63)
linux-aws-hwe
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

trusty Does not exist

upstream
Released (4.15~rc6)
xenial Not vulnerable
(4.15.0-1030.31~16.04.1)
linux-azure
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1002.2)
cosmic Not vulnerable
(4.15.0-1009.9)
trusty Not vulnerable
(4.15.0-1023.24~14.04.1)
upstream
Released (4.15~rc6)
xenial
Released (4.15.0-1013.13~16.04.2)
linux-azure-edge
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1002.2)
cosmic Does not exist

trusty Does not exist

upstream
Released (4.15~rc6)
xenial
Released (4.15.0-1013.13~16.04.2)
linux-euclid
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

trusty Does not exist

upstream
Released (4.15~rc6)
xenial Ignored
(was needed ESM criteria)
linux-gcp
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1001.1)
cosmic Not vulnerable
(4.15.0-1006.6)
trusty Does not exist

upstream
Released (4.15~rc6)
xenial
Released (4.15.0-1014.14~16.04.1)
linux-gcp-edge
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.18.0-1004.5~18.04.1)
cosmic Does not exist

trusty Does not exist

upstream
Released (4.15~rc6)
xenial Does not exist

linux-gke
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

trusty Does not exist

upstream
Released (4.15~rc6)
xenial Ignored
(end of standard support)
linux-goldfish
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (4.15~rc6)
xenial Ignored
(end of life)
linux-grouper
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (4.15~rc6)
xenial Does not exist

linux-hwe
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.18.0-13.14~18.04.1)
cosmic Does not exist

trusty Does not exist

upstream
Released (4.15~rc6)
xenial
Released (4.15.0-24.26~16.04.1)
linux-hwe-edge
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.18.0-12.13~18.04.1)
cosmic Does not exist

trusty Does not exist

upstream
Released (4.15~rc6)
xenial
Released (4.15.0-24.26~16.04.1)
linux-kvm
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1002.2)
cosmic Not vulnerable
(4.15.0-1008.8)
trusty Does not exist

upstream
Released (4.15~rc6)
xenial
Released (4.4.0-1020.25)
linux-lts-trusty
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

trusty Does not exist

upstream
Released (4.15~rc6)
xenial Does not exist

linux-lts-utopic
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [end of standard support])
upstream
Released (4.15~rc6)
xenial Does not exist

linux-lts-vivid
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [end of standard support])
upstream
Released (4.15~rc6)
xenial Does not exist

linux-lts-wily
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [end of standard support])
upstream
Released (4.15~rc6)
xenial Does not exist

linux-lts-xenial
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

trusty
Released (4.4.0-119.143~14.04.1)
upstream
Released (4.15~rc6)
xenial Does not exist

linux-maguro
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (4.15~rc6)
xenial Does not exist

linux-mako
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (4.15~rc6)
xenial Ignored
(abandoned)
linux-manta
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (4.15~rc6)
xenial Does not exist

linux-oem
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1002.3)
cosmic Not vulnerable
(4.15.0-1004.5)
trusty Does not exist

upstream
Released (4.15~rc6)
xenial Ignored
(end of standard support, was needs-triage)
linux-oracle
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1007.9)
cosmic Not vulnerable

trusty Does not exist

upstream
Released (4.15~rc6)
xenial Not vulnerable
(4.15.0-1007.9~16.04.1)
linux-raspi2
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1006.7)
cosmic Not vulnerable
(4.15.0-1010.11)
trusty Does not exist

upstream
Released (4.15~rc6)
xenial
Released (4.4.0-1086.94)

Severity score breakdown

Parameter Value
Base score 3.3
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact Low
Vector CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L