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CVE-2019-19252

Published: 25 November 2019

vcs_write in drivers/tty/vt/vc_screen.c in the Linux kernel through 5.3.13 does not prevent write access to vcsu devices, aka CID-0c9acb1af77a.

From the Ubuntu Security Team

Or Cohen discovered that the virtual console subsystem in the Linux kernel did not properly restrict writes to unimplemented vcsu (unicode) devices. A local attacker could possibly use this to cause a denial of service (system crash) or have other unspecified impacts.

Priority

Medium

Cvss 3 Severity Score

7.8

Score breakdown

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.13.0-16.19)
disco Ignored
(end of life, was pending)
eoan
Released (5.3.0-40.32)
focal Not vulnerable
(5.4.0-9.12)
trusty Ignored
(was needs-triage ESM criteria)
upstream
Released (5.5~rc1)
xenial Not vulnerable
(4.2.0-16.19)
Patches:
Introduced by

d21b0be246bf3bbf569e6e239f56abb529c7154e

Fixed by 0c9acb1af77a3cb8707e43f45b72c95266903cee
linux-aws
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1001.1)
disco Ignored
(end of life, was pending)
eoan
Released (5.3.0-1011.12)
focal Not vulnerable
(5.4.0-1005.5)
trusty Ignored
(was needs-triage ESM criteria)
upstream
Released (5.5~rc1)
xenial Not vulnerable
(4.4.0-1001.10)
linux-aws-5.0
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1024.27~18.04.1)
disco Does not exist

eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.5~rc1)
xenial Does not exist

linux-azure-5.3
Launchpad, Ubuntu, Debian
trusty Does not exist

upstream
Released (5.5~rc1)
bionic
Released (5.3.0-1013.14~18.04.1)
disco Does not exist

eoan Does not exist

focal Does not exist

xenial Does not exist

linux-aws-5.3
Launchpad, Ubuntu, Debian
bionic Not vulnerable

eoan Does not exist

focal Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

linux-azure-4.15
Launchpad, Ubuntu, Debian
bionic Not vulnerable

eoan Does not exist

focal Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

linux-aws-hwe
Launchpad, Ubuntu, Debian
bionic Does not exist

disco Does not exist

eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.5~rc1)
xenial Not vulnerable
(4.15.0-1030.31~16.04.1)
linux-azure
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1029.31~18.04.1)
disco Ignored
(end of life, was pending)
eoan
Released (5.3.0-1013.14)
focal Not vulnerable
(5.4.0-1006.6)
trusty Ignored
(was needs-triage ESM criteria)
upstream
Released (5.5~rc1)
xenial Not vulnerable
(4.11.0-1009.9)
linux-azure-edge
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needs-triage)
disco Does not exist

eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.5~rc1)
xenial Does not exist

linux-gcp
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1029.30~18.04.1)
disco Ignored
(end of life, was pending)
eoan
Released (5.3.0-1012.13)
focal Not vulnerable
(5.4.0-1005.5)
trusty Does not exist

upstream
Released (5.5~rc1)
xenial Not vulnerable
(4.10.0-1004.4)
linux-gcp-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1012.13~18.04.1)
disco Does not exist

eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.5~rc1)
xenial Does not exist

linux-gcp-edge
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needs-triage)
disco Does not exist

eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.5~rc1)
xenial Does not exist

linux-gke-4.15
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1030.32)
disco Does not exist

eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.5~rc1)
xenial Does not exist

linux-gke-5.0
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1029.30~18.04.1)
disco Does not exist

eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.5~rc1)
xenial Does not exist

linux-gke-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1012.13~18.04.1)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.5~rc1)
xenial Does not exist

linux-hwe
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-40.32~18.04.1)
disco Does not exist

eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.5~rc1)
xenial Not vulnerable
(4.8.0-36.36~16.04.1)
linux-hwe-edge
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needs-triage)
disco Does not exist

eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.5~rc1)
xenial Ignored
(end of life, was needs-triage)
linux-kvm
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1002.2)
disco Ignored
(end of life, was pending)
eoan
Released (5.3.0-1010.11)
focal Not vulnerable
(5.4.0-1004.4)
trusty Does not exist

upstream
Released (5.5~rc1)
xenial Not vulnerable
(4.4.0-1004.9)
linux-lts-trusty
Launchpad, Ubuntu, Debian
bionic Does not exist

disco Does not exist

eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.5~rc1)
xenial Does not exist

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

disco Does not exist

eoan Does not exist

focal Does not exist

trusty Ignored
(was needs-triage ESM criteria)
upstream
Released (5.5~rc1)
xenial Does not exist

linux-oem
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1002.3)
disco Not vulnerable
(4.15.0-1021.24)
eoan Not vulnerable
(4.15.0-1035.40)
focal Does not exist

trusty Does not exist

upstream
Released (5.5~rc1)
xenial Ignored
(end of standard support, was needs-triage)
linux-oem-5.6
Launchpad, Ubuntu, Debian
bionic Does not exist

eoan Does not exist

focal Not vulnerable
(5.6.0-1007.7)
trusty Does not exist

upstream
Released (5.5~rc1)
xenial Does not exist

linux-oem-osp1
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1037.42)
disco Ignored
(end of life)
eoan
Released (5.0.0-1037.42)
focal Does not exist

trusty Does not exist

upstream
Released (5.5~rc1)
xenial Does not exist

linux-oracle
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1007.9)
disco Ignored
(end of life, was pending)
eoan
Released (5.3.0-1009.10)
focal Not vulnerable
(5.4.0-1005.5)
trusty Does not exist

upstream
Released (5.5~rc1)
xenial Not vulnerable
(4.15.0-1007.9~16.04.1)
linux-oracle-5.0
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1010.15~18.04.1)
disco Does not exist

eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.5~rc1)
xenial Does not exist

linux-oracle-5.3
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.3.0-1011.12~18.04.1)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.5~rc1)
xenial Does not exist

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

eoan Does not exist

focal Not vulnerable
(5.4.0-1007.7)
trusty Does not exist

upstream
Released (5.5~rc1)
xenial Does not exist

linux-raspi2
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.13.0-1005.5)
disco Ignored
(end of life, was pending)
eoan
Released (5.3.0-1018.20)
focal Ignored
(end of life, was needed)
trusty Does not exist

upstream
Released (5.5~rc1)
xenial Not vulnerable
(4.2.0-1013.19)
linux-raspi2-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1018.20~18.04.1)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.5~rc1)
xenial Does not exist

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

eoan Does not exist

focal Not vulnerable
(5.4.0-24.28)
trusty Does not exist

upstream
Released (5.5~rc1)
xenial Does not exist

linux-snapdragon
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.4.0-1077.82)
disco Ignored
(end of life, was pending)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.5~rc1)
xenial Not vulnerable
(4.4.0-1012.12)

Severity score breakdown

Parameter Value
Base score 7.8
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H