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CVE-2020-25668

Published: 2 November 2020

A flaw was found in Linux Kernel because access to the global variable fg_console is not properly synchronized leading to a use after free in con_font_op.

From the Ubuntu security team

Minh Yuan discovered that the tty driver in the Linux kernel contained race conditions when handling fonts. A local attacker could possibly use this to expose sensitive information (kernel memory).

Priority

Medium

CVSS 3 base score: 7.0

Status

Package Release Status
linux-aws-5.8
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

groovy Does not exist

hirsute Does not exist

focal Not vulnerable
(5.8.0-1035.37~20.04.1)
upstream
Released (5.10~rc3)
impish Does not exist

jammy Does not exist

linux-azure-5.8
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

groovy Does not exist

hirsute Does not exist

focal Not vulnerable
(5.8.0-1033.35~20.04.1)
upstream
Released (5.10~rc3)
impish Does not exist

jammy Does not exist

linux-gcp-5.8
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

groovy Does not exist

hirsute Does not exist

focal Not vulnerable
(5.8.0-1032.34~20.04.1)
upstream
Released (5.10~rc3)
impish Does not exist

jammy Does not exist

linux-oracle-5.8
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

groovy Does not exist

hirsute Does not exist

focal Not vulnerable
(5.8.0-1031.32~20.04.2)
upstream
Released (5.10~rc3)
impish Does not exist

jammy Does not exist

linux-riscv-5.8
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

groovy Does not exist

hirsute Does not exist

upstream
Released (5.10~rc3)
focal
Released (5.8.0-17.19~20.04.1)
impish Does not exist

jammy Does not exist

linux-hwe-5.11
Launchpad, Ubuntu, Debian
focal Not vulnerable
(5.11.0-22.23~20.04.1)
upstream
Released (5.10~rc3)
trusty Does not exist

xenial Does not exist

bionic Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

linux-riscv-5.11
Launchpad, Ubuntu, Debian
focal Not vulnerable
(5.11.0-1015.16~20.04.1)
upstream
Released (5.10~rc3)
trusty Does not exist

xenial Does not exist

bionic Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

linux-oem-5.13
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

focal Not vulnerable
(5.13.0-1009.10)
hirsute Does not exist

upstream
Released (5.10~rc3)
impish Does not exist

jammy Does not exist

linux-aws-5.11
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

focal Not vulnerable
(5.11.0-1009.9~20.04.2)
hirsute Does not exist

upstream
Released (5.10~rc3)
impish Does not exist

jammy Does not exist

linux-azure-5.11
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

focal Not vulnerable
(5.11.0-1007.7~20.04.2)
hirsute Does not exist

impish Does not exist

upstream
Released (5.10~rc3)
jammy Does not exist

linux-oracle-5.11
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

hirsute Does not exist

impish Does not exist

focal Not vulnerable
(5.11.0-1008.8~20.04.1)
upstream
Released (5.10~rc3)
jammy Does not exist

linux-bluefield
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

hirsute Does not exist

upstream
Released (5.10~rc3)
focal
Released (5.4.0-1011.14)
impish Does not exist

jammy Does not exist

linux
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-129.132)
focal
Released (5.4.0-59.65)
precise Ignored
(was needs-triage ESM criteria)
groovy
Released (5.8.0-44.50)
upstream
Released (5.10~rc3)
impish Not vulnerable
(5.11.0-16.17)
xenial
Released (4.4.0-198.230)
trusty Ignored
(was needed ESM criteria)
hirsute Not vulnerable
(5.10.0-14.15)
jammy Not vulnerable
(5.13.0-19.19)
linux-hwe
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

bionic Ignored
(replaced by linux-hwe-5.4)
focal Does not exist

groovy Does not exist

hirsute Does not exist

upstream
Released (5.10~rc3)
xenial
Released (4.15.0-129.132~16.04.1)
impish Does not exist

jammy Does not exist

linux-hwe-5.4
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

xenial Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

upstream
Released (5.10~rc3)
impish Does not exist

bionic
Released (5.4.0-59.65~18.04.1)
jammy Does not exist

linux-hwe-edge
Launchpad, Ubuntu, Debian
upstream
Released (5.10~rc3)
precise Does not exist

trusty Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

bionic Ignored
(was needs-triage now end-of-life)
xenial Ignored
(was needs-triage now end-of-life)
impish Does not exist

jammy Does not exist

linux-lts-trusty
Launchpad, Ubuntu, Debian
upstream
Released (5.10~rc3)
trusty Does not exist

xenial Does not exist

bionic Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

precise Ignored
(was needs-triage ESM criteria)
impish Does not exist

jammy Does not exist

linux-lts-xenial
Launchpad, Ubuntu, Debian
upstream
Released (5.10~rc3)
precise Does not exist

xenial Does not exist

bionic Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

impish Does not exist

trusty
Released (4.4.0-198.230~14.04.1)
jammy Does not exist

linux-kvm
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

groovy
Released (5.8.0-1019.21)
hirsute Not vulnerable
(5.8.0-1020.22+21.04.1)
upstream
Released (5.10~rc3)
impish Not vulnerable
(5.11.0-1006.6)
xenial
Released (4.4.0-1085.94)
bionic
Released (4.15.0-1082.84)
focal
Released (5.4.0-1031.32)
jammy Not vulnerable
(5.13.0-1004.4)
linux-aws
Launchpad, Ubuntu, Debian
precise Does not exist

bionic
Released (4.15.0-1091.96)
groovy
Released (5.8.0-1024.26)
hirsute Not vulnerable
(5.8.0-1025.27+21.04.1)
upstream
Released (5.10~rc3)
impish Not vulnerable
(5.11.0-1006.6)
xenial
Released (4.4.0-1119.133)
focal
Released (5.4.0-1034.35)
trusty
Released (4.4.0-1083.87)
jammy Not vulnerable
(5.13.0-1005.6)
linux-aws-5.0
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

xenial Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

bionic Ignored
(was needs-triage now end-of-life)
upstream
Released (5.10~rc3)
impish Does not exist

jammy Does not exist

linux-aws-5.3
Launchpad, Ubuntu, Debian
upstream
Released (5.10~rc3)
precise Does not exist

trusty Does not exist

xenial Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

bionic Ignored
(was needs-triage now end-of-life)
impish Does not exist

jammy Does not exist

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

trusty Does not exist

xenial Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

upstream
Released (5.10~rc3)
impish Does not exist

bionic
Released (5.4.0-1034.35~18.04.1)
jammy Does not exist

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

trusty Does not exist

xenial
Released (4.15.0-1091.96~16.04.1)
bionic Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

upstream
Released (5.10~rc3)
impish Does not exist

jammy Does not exist

linux-azure
Launchpad, Ubuntu, Debian
precise Does not exist

focal
Released (5.4.0-1035.36)
bionic Ignored
(was needs-triage now end-of-life)
groovy
Released (5.8.0-1023.25)
hirsute Not vulnerable
(5.8.0-1024.26+21.04.1)
upstream
Released (5.10~rc3)
xenial
Released (4.15.0-1103.114~16.04.1)
impish Not vulnerable
(5.11.0-1004.4)
trusty
Released (4.15.0-1103.114~14.04.1)
jammy Not vulnerable
(5.13.0-1006.7)
linux-azure-4.15
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

xenial Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

upstream
Released (5.10~rc3)
impish Does not exist

bionic
Released (4.15.0-1103.114)
jammy Does not exist

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

trusty Does not exist

xenial Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

bionic Ignored
(was needs-triage now end-of-life)
upstream
Released (5.10~rc3)
impish Does not exist

jammy Does not exist

linux-azure-5.4
Launchpad, Ubuntu, Debian
upstream
Released (5.10~rc3)
precise Does not exist

trusty Does not exist

xenial Does not exist

bionic
Released (5.4.0-1035.36~18.04.1)
focal Does not exist

groovy Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

linux-azure-edge
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

xenial Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

bionic Ignored
(was needs-triage now end-of-life)
upstream
Released (5.10~rc3)
impish Does not exist

jammy Does not exist

linux-gcp
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

focal
Released (5.4.0-1033.35)
bionic Ignored
(was needs-triage now end-of-life)
groovy
Released (5.8.0-1023.24)
hirsute Not vulnerable
(5.8.0-1024.25+21.04.1)
upstream
Released (5.10~rc3)
impish Not vulnerable
(5.11.0-1006.6)
xenial
Released (4.15.0-1091.104~16.04.1)
jammy Not vulnerable
(5.13.0-1005.6)
linux-gcp-4.15
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

xenial Does not exist

bionic
Released (4.15.0-1091.104)
focal Does not exist

groovy Does not exist

hirsute Does not exist

upstream
Released (5.10~rc3)
impish Does not exist

jammy Does not exist

linux-gcp-5.3
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

xenial Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

bionic Ignored
(was needs-triage now end-of-life)
upstream
Released (5.10~rc3)
impish Does not exist

jammy Does not exist

linux-gcp-5.4
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

xenial Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

upstream
Released (5.10~rc3)
impish Does not exist

bionic
Released (5.4.0-1033.35~18.04.1)
jammy Does not exist

linux-gcp-edge
Launchpad, Ubuntu, Debian
upstream
Released (5.10~rc3)
precise Does not exist

trusty Does not exist

xenial Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

bionic Ignored
(was needs-triage now end-of-life)
impish Does not exist

jammy Does not exist

linux-gke-4.15
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

xenial Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

upstream
Released (5.10~rc3)
impish Does not exist

bionic
Released (4.15.0-1077.82)
jammy Does not exist

linux-gke-5.0
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

xenial Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

bionic Ignored
(was needed now end-of-life)
upstream
Released (5.10~rc3)
impish Does not exist

jammy Does not exist

linux-gke-5.3
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

xenial Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

bionic Ignored
(was needed now end-of-life)
upstream
Released (5.10~rc3)
impish Does not exist

jammy Does not exist

linux-oracle
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

groovy
Released (5.8.0-1021.22)
bionic
Released (4.15.0-1062.68)
upstream
Released (5.10~rc3)
xenial
Released (4.15.0-1062.68~16.04.1)
impish Not vulnerable
(5.11.0-1005.5)
focal
Released (5.4.0-1034.36)
hirsute Not vulnerable
(5.8.0-1022.23+21.04.1)
jammy Not vulnerable
(5.13.0-1008.10)
linux-oracle-5.0
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

xenial Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

bionic Ignored
(was needs-triage now end-of-life)
upstream
Released (5.10~rc3)
impish Does not exist

jammy Does not exist

linux-oracle-5.3
Launchpad, Ubuntu, Debian
upstream
Released (5.10~rc3)
precise Does not exist

trusty Does not exist

xenial Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

bionic Ignored
(was needs-triage now end-of-life)
impish Does not exist

jammy Does not exist

linux-oracle-5.4
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

xenial Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

upstream
Released (5.10~rc3)
impish Does not exist

bionic
Released (5.4.0-1034.36~18.04.1)
jammy Does not exist

linux-oem
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

bionic Ignored
(was pending [4.15.0-1104.115] now end-of-life)
focal Does not exist

groovy Does not exist

hirsute Does not exist

xenial Ignored
(was needs-triage now end-of-life)
upstream
Released (5.10~rc3)
impish Does not exist

jammy Does not exist

linux-oem-5.6
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

xenial Does not exist

bionic Does not exist

groovy Does not exist

hirsute Does not exist

focal
Released (5.6.0-1050.54)
upstream
Released (5.10~rc3)
impish Does not exist

jammy Does not exist

linux-oem-osp1
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

xenial Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

upstream
Released (5.10~rc3)
impish Does not exist

bionic Ignored
(was needed now end-of-life)
jammy Does not exist

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

trusty Does not exist

xenial Does not exist

bionic Does not exist

focal
Released (5.4.0-1026.29)
groovy
Released (5.8.0-1016.19)
hirsute Not vulnerable
(5.11.0-1003.3)
upstream
Released (5.10~rc3)
impish Not vulnerable
(5.11.0-1007.7)
jammy Not vulnerable
(5.13.0-1008.9)
linux-raspi2
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

focal Ignored
(replaced by linux-raspi)
groovy Does not exist

hirsute Does not exist

upstream
Released (5.10~rc3)
xenial
Released (4.4.0-1143.153)
impish Does not exist

bionic
Released (4.15.0-1077.82)
jammy Does not exist

linux-raspi2-5.3
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

xenial Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

bionic Ignored
(was needed now end-of-life)
upstream
Released (5.10~rc3)
impish Does not exist

jammy Does not exist

linux-raspi-5.4
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

xenial Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

upstream
Released (5.10~rc3)
impish Does not exist

bionic
Released (5.4.0-1026.29~18.04.1)
jammy Does not exist

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

trusty Does not exist

xenial Does not exist

bionic Does not exist

groovy
Released (5.8.0-17.19)
hirsute Not vulnerable
(5.11.0-1004.4)
upstream
Released (5.10~rc3)
impish Not vulnerable
(5.11.0-1007.7)
focal
Released (5.4.0-40.45)
jammy Not vulnerable
(5.13.0-1004.4)
linux-snapdragon
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

bionic
Released (4.15.0-1094.103)
focal Does not exist

groovy Does not exist

hirsute Does not exist

upstream
Released (5.10~rc3)
impish Does not exist

xenial
Released (4.4.0-1147.157)
jammy Does not exist

linux-hwe-5.8
Launchpad, Ubuntu, Debian
impish Does not exist

precise Does not exist

trusty Does not exist

xenial Does not exist

bionic Does not exist

focal
Released (5.8.0-44.50~20.04.1)
groovy Does not exist

hirsute Does not exist

upstream
Released (5.10~rc3)
jammy Does not exist

linux-gke-5.4
Launchpad, Ubuntu, Debian
impish Does not exist

precise Does not exist

trusty Does not exist

xenial Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

upstream
Released (5.10~rc3)
bionic
Released (5.4.0-1033.35~18.04.1)
jammy Does not exist

linux-gkeop-5.4
Launchpad, Ubuntu, Debian
impish Does not exist

precise Does not exist

trusty Does not exist

xenial Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

bionic
Released (5.4.0-1008.9~18.04.1)
upstream
Released (5.10~rc3)
jammy Does not exist

linux-dell300x
Launchpad, Ubuntu, Debian
impish Does not exist

precise Does not exist

trusty Does not exist

xenial Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

upstream
Released (5.10~rc3)
bionic
Released (4.15.0-1010.14)
jammy Does not exist

linux-oem-5.10
Launchpad, Ubuntu, Debian
impish Does not exist

precise Does not exist

trusty Does not exist

xenial Does not exist

bionic Does not exist

groovy Does not exist

hirsute Does not exist

focal Not vulnerable
(5.10.0-1008.9)
upstream
Released (5.10~rc3)
jammy Does not exist

linux-gkeop
Launchpad, Ubuntu, Debian
impish Does not exist

precise Does not exist

trusty Does not exist

xenial Does not exist

bionic Does not exist

groovy Does not exist

hirsute Does not exist

focal Not vulnerable
(5.4.0-1008.9)
upstream
Released (5.10~rc3)
jammy Does not exist

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

precise Does not exist

trusty Does not exist

xenial Ignored
(reached end of standard support)
bionic Does not exist

focal Not vulnerable
(5.4.0-1033.35)
groovy Does not exist

hirsute Does not exist

upstream
Released (5.10~rc3)
jammy Not vulnerable
(5.15.0-1002.2)
linux-ibm
Launchpad, Ubuntu, Debian
impish Does not exist

trusty Does not exist

xenial Does not exist

bionic Does not exist

hirsute Does not exist

focal Not vulnerable
(5.4.0-1003.4)
upstream
Released (5.10~rc3)
jammy Not vulnerable
(5.15.0-1002.2)
linux-gcp-5.11
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

hirsute Does not exist

impish Does not exist

focal Not vulnerable
(5.11.0-1009.10~20.04.1)
upstream
Released (5.10~rc3)
jammy Does not exist

linux-oem-5.14
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

hirsute Does not exist

impish Does not exist

focal Not vulnerable
(5.14.0-1004.4)
upstream
Released (5.10~rc3)
jammy Does not exist

linux-intel-5.13
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

focal Not vulnerable

hirsute Does not exist

impish Does not exist

upstream
Released (5.10~rc3)
jammy Does not exist

linux-azure-5.13
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

impish Does not exist

focal Not vulnerable
(5.13.0-1009.10~20.04.2)
upstream
Released (5.10~rc3)
jammy Does not exist

linux-hwe-5.13
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

impish Does not exist

focal Not vulnerable
(5.13.0-21.21~20.04.1)
upstream
Released (5.10~rc3)
jammy Does not exist

linux-aws-5.13
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

impish Does not exist

focal Not vulnerable
(5.13.0-1008.9~20.04.2)
upstream
Released (5.10~rc3)
jammy Does not exist

linux-fips
Launchpad, Ubuntu, Debian
trusty Does not exist

bionic Does not exist

focal Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.10~rc3)
xenial Not vulnerable
(4.4.0-1073.79)
jammy Does not exist

linux-oracle-5.13
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

impish Does not exist

focal Not vulnerable
(5.13.0-1011.13~20.04.2)
upstream
Released (5.10~rc3)
jammy Does not exist

linux-gcp-5.13
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

impish Does not exist

focal Not vulnerable
(5.13.0-1008.9~20.04.3)
upstream
Released (5.10~rc3)
jammy Does not exist

linux-ibm-5.4
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

focal Does not exist

impish Does not exist

bionic Not vulnerable
(5.4.0-1010.11~18.04.2)
upstream
Released (5.10~rc3)
jammy Does not exist

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

xenial Does not exist

bionic Does not exist

impish Does not exist

focal Needed

upstream
Released (5.10~rc3)
jammy Does not exist

linux-lowlatency
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

focal Does not exist

impish Does not exist

jammy Not vulnerable

upstream Needs triage

linux-oem-5.17
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

focal Does not exist

impish Does not exist

jammy Not vulnerable

upstream Needs triage