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CVE-2020-8649

Published: 6 February 2020

There is a use-after-free vulnerability in the Linux kernel through 5.5.2 in the vgacon_invert_region function in drivers/video/console/vgacon.c.

From the Ubuntu Security Team

It was discovered that the virtual terminal implementation in the Linux kernel did not properly handle resize events. A local attacker could use this to expose sensitive information.

Priority

Medium

Cvss 3 Severity Score

5.9

Score breakdown

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-99.100)
eoan
Released (5.3.0-51.44)
focal Not vulnerable
(5.4.0-21.25)
trusty Ignored
(was needs-triage ESM criteria)
upstream
Released (5.6~rc5)
xenial
Released (4.4.0-178.208)
Patches:
Introduced by

0aec4867dca149e2049e8439b76bd82ad9dac52c

Fixed by 513dc792d6060d5ef572e43852683097a8420f56
linux-aws
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1066.70)
eoan
Released (5.3.0-1017.18)
focal Not vulnerable
(5.4.0-1007.7)
trusty Ignored
(was needs-triage ESM criteria)
upstream
Released (5.6~rc5)
xenial
Released (4.4.0-1106.117)
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 (5.6~rc5)
xenial Does not exist

linux-aws-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1017.18~18.04.1)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.6~rc5)
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 (5.6~rc5)
xenial
Released (4.15.0-1066.70~16.04.1)
linux-azure
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needs-triage)
eoan
Released (5.3.0-1020.21)
focal Not vulnerable
(5.4.0-1008.8)
trusty Ignored
(was needs-triage ESM criteria)
upstream
Released (5.6~rc5)
xenial
Released (4.15.0-1082.92~16.04.1)
linux-azure-4.15
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1082.92)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.6~rc5)
xenial Does not exist

linux-azure-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1020.21~18.04.1)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.6~rc5)
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 (5.6~rc5)
xenial Does not exist

linux-gcp
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needs-triage)
eoan
Released (5.3.0-1018.19)
focal Not vulnerable
(5.4.0-1007.7)
trusty Does not exist

upstream
Released (5.6~rc5)
xenial
Released (4.15.0-1061.65)
linux-gcp-4.15
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1071.81)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.6~rc5)
xenial Does not exist

linux-gcp-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1018.19~18.04.1)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.6~rc5)
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 (5.6~rc5)
xenial Does not exist

linux-gke-4.15
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1058.61)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.6~rc5)
xenial Does not exist

linux-gke-5.0
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1035.36)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.6~rc5)
xenial Does not exist

linux-gke-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1018.19~18.04.1)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.6~rc5)
xenial Does not exist

linux-hwe
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-51.44~18.04.2)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.6~rc5)
xenial
Released (4.15.0-99.100~16.04.1)
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 (5.6~rc5)
xenial Ignored
(end of life, was needs-triage)
linux-kvm
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1059.60)
eoan
Released (5.3.0-1016.17)
focal Not vulnerable
(5.4.0-1006.6)
trusty Does not exist

upstream
Released (5.6~rc5)
xenial
Released (4.4.0-1070.77)
linux-lts-trusty
Launchpad, Ubuntu, Debian
bionic Does not exist

eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.6~rc5)
xenial Does not exist

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

eoan Does not exist

focal Does not exist

trusty Ignored
(was needs-triage ESM criteria)
upstream
Released (5.6~rc5)
xenial Does not exist

linux-oem
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1080.90)
eoan Ignored
(end of life, was pending)
focal Does not exist

trusty Does not exist

upstream
Released (5.6~rc5)
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 (5.6~rc5)
xenial Does not exist

linux-oem-osp1
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1050.55)
eoan Ignored
(end of life, was pending)
focal Does not exist

trusty Does not exist

upstream
Released (5.6~rc5)
xenial Does not exist

linux-oracle
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1038.42)
eoan
Released (5.3.0-1016.18)
focal Not vulnerable
(5.4.0-1007.7)
trusty Does not exist

upstream
Released (5.6~rc5)
xenial
Released (4.15.0-1038.42~16.04.1)
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 (5.6~rc5)
xenial Does not exist

linux-oracle-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1016.18~18.04.1)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.6~rc5)
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 (5.6~rc5)
xenial Does not exist

linux-raspi2
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1061.65)
eoan
Released (5.3.0-1023.25)
focal Ignored
(end of life, was needs-triage)
trusty Does not exist

upstream
Released (5.6~rc5)
xenial
Released (4.4.0-1132.141)
linux-raspi2-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1023.25~18.04.1)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.6~rc5)
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 (5.6~rc5)
xenial Does not exist

linux-snapdragon
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1077.84)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.6~rc5)
xenial
Released (4.4.0-1136.144)

Severity score breakdown

Parameter Value
Base score 5.9
Attack vector Physical
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H