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CVE-2020-13974

Published: 9 June 2020

An issue was discovered in the Linux kernel 4.4 through 5.7.1. drivers/tty/vt/keyboard.c has an integer overflow if k_ascii is called several times in a row, aka CID-b86dab054059. NOTE: Members in the community argue that the integer overflow does not lead to a security issue in this case.

From the Ubuntu Security Team

It was discovered that the Virtual Terminal keyboard driver in the Linux kernel contained an integer overflow. A local attacker could possibly use this to have an unspecified impact.

Notes

AuthorNote
sbeattie
reproducer in lore.kernel.org link

Priority

Low

Cvss 3 Severity Score

7.8

Score breakdown

Status

Package Release Status
linux-oem-5.6
Launchpad, Ubuntu, Debian
focal
Released (5.6.0-1018.18)
bionic Does not exist

eoan Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-raspi2
Launchpad, Ubuntu, Debian
focal Ignored
(end of life, was needs-triage)
eoan Ignored
(end of life, was pending)
bionic
Released (4.15.0-1068.72)
trusty Does not exist

upstream
Released (5.8~rc1)
xenial
Released (4.4.0-1136.145)
linux-aws
Launchpad, Ubuntu, Debian
eoan Ignored
(end of life, was pending)
bionic
Released (4.15.0-1080.84)
focal
Released (5.4.0-1022.22)
trusty
Released (4.4.0-1075.79)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream
Released (5.8~rc1)
xenial
Released (4.4.0-1111.123)
linux-aws-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1032.34~18.04.2)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-azure
Launchpad, Ubuntu, Debian
eoan Ignored
(end of life, was pending)
bionic Ignored
(end of life, was needs-triage)
focal
Released (5.4.0-1023.23)
trusty
Released (4.15.0-1093.103~14.04.1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream
Released (5.8~rc1)
xenial
Released (4.15.0-1093.103~16.04.1)
linux-azure-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1034.35~18.04.1)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-gcp
Launchpad, Ubuntu, Debian
eoan Ignored
(end of life, was pending)
bionic Ignored
(end of life, was needs-triage)
focal
Released (5.4.0-1022.22)
trusty Does not exist

upstream
Released (5.8~rc1)
xenial
Released (4.15.0-1081.92~16.04.1)
linux-gcp-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1032.34~18.04.1)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-gke-5.0
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1045.46)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-gke-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1032.34~18.04.1)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-hwe
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-64.58~18.04.1)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial
Released (4.15.0-115.116~16.04.1)
linux-hwe-5.4
Launchpad, Ubuntu, Debian
upstream
Released (5.8~rc1)
bionic
Released (5.4.0-45.49~18.04.2)
focal Does not exist

trusty Does not exist

xenial Does not exist

linux-kvm
Launchpad, Ubuntu, Debian
eoan Ignored
(end of life, was pending)
bionic
Released (4.15.0-1072.73)
focal
Released (5.4.0-1021.21)
trusty Does not exist

upstream
Released (5.8~rc1)
xenial
Released (4.4.0-1077.84)
linux-oem-osp1
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1065.70)
eoan Ignored
(end of life)
focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-oracle
Launchpad, Ubuntu, Debian
eoan Ignored
(end of life, was pending)
bionic
Released (4.15.0-1051.55)
focal
Released (5.4.0-1022.22)
trusty Does not exist

upstream
Released (5.8~rc1)
xenial
Released (4.15.0-1051.55~16.04.1)
linux-oracle-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1030.32~18.04.1)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-raspi-5.4
Launchpad, Ubuntu, Debian
upstream
Released (5.8~rc1)
bionic
Released (5.4.0-1016.17~18.04.1)
focal Does not exist

trusty Does not exist

xenial Does not exist

linux-raspi2-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1030.32~18.04.2)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-riscv
Launchpad, Ubuntu, Debian
focal
Released (5.4.0-31.35)
bionic Does not exist

eoan Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-115.116)
eoan Ignored
(end of life, was pending)
focal
Released (5.4.0-45.49)
trusty Ignored
(was needs-triage ESM criteria)
upstream
Released (5.8~rc1)
xenial
Released (4.4.0-186.216)
Patches:
Introduced by

1da177e4c3f41524e886b7f1b8a0c1fc7321cac2

Fixed by b86dab054059b970111b5516ae548efaae5b3aae
linux-hwe-edge
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needs-triage)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Ignored
(end of life, was needs-triage)
linux-lts-trusty
Launchpad, Ubuntu, Debian
bionic Does not exist

eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

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

eoan Does not exist

focal Does not exist

trusty
Released (4.4.0-186.216~14.04.1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream
Released (5.8~rc1)
xenial Does not exist

linux-aws-5.4
Launchpad, Ubuntu, Debian
focal Does not exist

bionic
Released (5.4.0-1022.22~18.04.1)
trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-aws-5.0
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needs-triage)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

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

eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial
Released (4.15.0-1080.84~16.04.1)
linux-azure-4.15
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1093.103)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-azure-5.4
Launchpad, Ubuntu, Debian
bionic
Released (5.4.0-1023.23~18.04.1)
focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

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

focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-gcp-4.15
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1081.92)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-gcp-5.4
Launchpad, Ubuntu, Debian
bionic
Released (5.4.0-1022.22~18.04.1)
focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

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

focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-gke-4.15
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1067.70)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-oem
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1094.104)
eoan Ignored
(end of life)
focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Ignored
(end of standard support, was needs-triage)
linux-oracle-5.0
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needs-triage)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-oracle-5.4
Launchpad, Ubuntu, Debian
bionic
Released (5.4.0-1022.22~18.04.1)
focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

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

eoan Does not exist

focal
Released (5.4.0-1016.17)
trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-snapdragon
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1084.92)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial
Released (4.4.0-1140.148)

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