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CVE-2020-14356

Published: 19 August 2020

A flaw null pointer dereference in the Linux kernel cgroupv2 subsystem in versions before 5.7.10 was found in the way when reboot the system. A local user could use this flaw to crash the system or escalate their privileges on the system.

From the Ubuntu Security Team

It was discovered that the cgroup v2 subsystem in the Linux kernel did not properly perform reference counting in some situations, leading to a NULL pointer dereference. A local attacker could use this to cause a denial of service or possibly gain administrative privileges.

Notes

AuthorNote
sbeattie
commit 1bfba2f4270c64c912 is in the linux-stable tree hash

Priority

Medium

Cvss 3 Severity Score

7.8

Score breakdown

Status

Package Release Status
linux-gke-5.4
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.4.0-1025.25~18.04.1)
upstream
Released (5.8~rc5)
focal Does not exist

groovy Does not exist

trusty Does not exist

xenial Does not exist

linux-gkeop-5.4
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.4.0-1001.1)
upstream
Released (5.8~rc5)
focal Does not exist

groovy Does not exist

trusty Does not exist

xenial Does not exist

linux-hwe-5.8
Launchpad, Ubuntu, Debian
focal Not vulnerable
(5.8.0-23.24~20.04.1)
upstream
Released (5.8~rc5)
bionic Does not exist

groovy Does not exist

trusty Does not exist

xenial Does not exist

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

groovy Does not exist

trusty Does not exist

xenial Does not exist

bionic Not vulnerable
(4.15.0-1005.8)
upstream
Released (5.8~rc5)
linux
Launchpad, Ubuntu, Debian
focal
Released (5.4.0-45.49)
groovy Not vulnerable
(5.8.0-16.17)
trusty Ignored
(was needs-triage ESM criteria)
upstream
Released (5.8~rc5)
xenial Not vulnerable
(4.2.0-16.19)
bionic
Released (4.15.0-118.119)
Patches:
Introduced by

ad0f75e5f57ccbceec13274e1e242f2b5a6397ed

Fixed by 14b032b8f8fce03a546dcf365454bec8c4a58d7d
Introduced by

bd1060a1d67128bb8fbe2e1384c518912cbe54e7

Fixed by ad0f75e5f57ccbceec13274e1e242f2b5a6397ed
Introduced by

23ec03076333eea8882343af3f82c8ef53350e8c

Fixed by 1bfba2f4270c64c912756fc76621bbce959ddf2e
linux-aws
Launchpad, Ubuntu, Debian
focal
Released (5.4.0-1022.22)
groovy Not vulnerable
(5.8.0-1004.4)
trusty Ignored
(was needs-triage ESM criteria)
upstream
Released (5.8~rc5)
xenial Not vulnerable
(4.4.0-1001.10)
bionic
Released (4.15.0-1083.87)
linux-aws-5.0
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needs-triage)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc5)
xenial Does not exist

linux-aws-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1034.36)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc5)
xenial Does not exist

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

focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc5)
xenial
Released (4.15.0-1083.87~16.04.1)
linux-aws-5.4
Launchpad, Ubuntu, Debian
bionic
Released (5.4.0-1022.22~18.04.1)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc5)
xenial Does not exist

linux-azure
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needs-triage)
focal
Released (5.4.0-1023.23)
groovy Not vulnerable
(5.8.0-1004.4)
trusty
Released (4.15.0-1096.106~14.04.1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream
Released (5.8~rc5)
xenial
Released (4.15.0-1096.106~16.04.1)
linux-azure-4.15
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1096.106)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc5)
xenial Does not exist

linux-azure-5.3
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needs-triage)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc5)
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

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc5)
xenial Does not exist

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

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc5)
xenial Does not exist

linux-gcp
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needs-triage)
focal
Released (5.4.0-1022.22)
groovy Not vulnerable
(5.8.0-1002.2)
trusty Does not exist

upstream
Released (5.8~rc5)
xenial
Released (4.15.0-1084.95~16.04.1)
linux-gcp-4.15
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1084.95)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc5)
xenial Does not exist

linux-gcp-5.3
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needs-triage)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc5)
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

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc5)
xenial Does not exist

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

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc5)
xenial Does not exist

linux-gke-4.15
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1070.73)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc5)
xenial Does not exist

linux-gke-5.0
Launchpad, Ubuntu, Debian
bionic Ignored
(end of standard support, was needed)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc5)
xenial Does not exist

linux-gke-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1034.36)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc5)
xenial Does not exist

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

focal Not vulnerable
(5.4.0-1008.9)
groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc5)
xenial Does not exist

linux-hwe
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-66.60)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc5)
xenial
Released (4.15.0-118.119~16.04.1)
linux-hwe-5.4
Launchpad, Ubuntu, Debian
bionic
Released (5.4.0-45.49~18.04.2)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc5)
xenial Does not exist

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

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc5)
xenial Ignored
(end of life, was needs-triage)
linux-kvm
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1075.76)
focal
Released (5.4.0-1021.21)
groovy Not vulnerable
(5.8.0-1001.1)
trusty Does not exist

upstream
Released (5.8~rc5)
xenial Not vulnerable
(4.4.0-1004.9)
linux-lts-trusty
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc5)
xenial Does not exist

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

focal Does not exist

groovy Does not exist

trusty Ignored
(was needs-triage ESM criteria)
upstream
Released (5.8~rc5)
xenial Does not exist

linux-oem
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1097.107)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc5)
xenial Ignored
(end of standard support, was needs-triage)
linux-oem-5.10
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Not vulnerable
(5.10.0-1008.9)
groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc5)
xenial Does not exist

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

focal
Released (5.6.0-1021.21)
groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc5)
xenial Does not exist

linux-oem-osp1
Launchpad, Ubuntu, Debian
bionic Ignored
(end of standard support, was needed)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc5)
xenial Does not exist

linux-oracle
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1054.58)
focal
Released (5.4.0-1022.22)
groovy Not vulnerable
(5.8.0-1001.1)
trusty Does not exist

upstream
Released (5.8~rc5)
xenial
Released (4.15.0-1054.58~16.04.1)
linux-oracle-5.0
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needs-triage)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc5)
xenial Does not exist

linux-oracle-5.3
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needs-triage)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc5)
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

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc5)
xenial Does not exist

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

focal
Released (5.4.0-1016.17)
groovy Not vulnerable
(5.4.0-1016.17)
trusty Does not exist

upstream
Released (5.8~rc5)
xenial Does not exist

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

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc5)
xenial Does not exist

linux-raspi2
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1071.75)
focal Ignored
(end of life, was needs-triage)
groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc5)
xenial Not vulnerable
(4.2.0-1013.19)
linux-raspi2-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1032.34)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc5)
xenial Does not exist

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

focal
Released (5.4.0-31.35)
groovy Not vulnerable
(5.8.0-1.1)
trusty Does not exist

upstream
Released (5.8~rc5)
xenial Does not exist

linux-snapdragon
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1087.95)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc5)
xenial Not vulnerable
(4.4.0-1013.15)

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