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CVE-2020-12114

Published: 4 May 2020

A pivot_root race condition in fs/namespace.c in the Linux kernel 4.4.x before 4.4.221, 4.9.x before 4.9.221, 4.14.x before 4.14.178, 4.19.x before 4.19.119, and 5.x before 5.3 allows local users to cause a denial of service (panic) by corrupting a mountpoint reference counter.

From the Ubuntu Security Team

Piotr Krysiuk discovered that race conditions existed in the file system implementation in the Linux kernel. A local attacker could use this to cause a denial of service (system crash).

Priority

Medium

Cvss 3 Severity Score

4.7

Score breakdown

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-106.107)
eoan
Released (5.3.0-59.53)
focal
Released (5.4.0-37.41)
trusty
Released (3.13.0-180.231)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream
Released (5.7~rc4)
xenial
Released (4.4.0-184.214)
Patches:
Introduced by

84d17192d2afd52aeba88c71ae4959a015f56a38

Fixed by 4edbe133f851c9e3a2f2a1db367e826b01e72594|local-2020-12114-fix
Introduced by

84d17192d2afd52aeba88c71ae4959a015f56a38

Fixed by b0d3869ce9eeacbb1bbd541909beeef4126426d5
linux-hwe
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-59.53~18.04.1)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.7~rc4)
xenial
Released (4.15.0-106.107~16.04.1)
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 (5.7~rc4)
xenial Ignored
(end of life, was needs-triage)
linux-kvm
Launchpad, Ubuntu, Debian
trusty Does not exist

upstream
Released (5.7~rc4)
bionic
Released (4.15.0-1067.68)
eoan
Released (5.3.0-1023.25)
focal
Released (5.4.0-1015.15)
xenial
Released (4.4.0-1075.82)
linux-lts-trusty
Launchpad, Ubuntu, Debian
bionic Does not exist

eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.7~rc4)
xenial Does not exist

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

eoan Does not exist

focal Does not exist

trusty
Released (4.4.0-184.214~14.04.1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream
Released (5.7~rc4)
xenial Does not exist

linux-oem
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1087.97)
eoan Ignored
(end of life)
focal Does not exist

trusty Does not exist

upstream
Released (5.7~rc4)
xenial Ignored
(end of standard support, was needs-triage)
linux-aws
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1073.77)
eoan
Released (5.3.0-1023.25)
focal
Released (5.4.0-1015.15)
trusty
Released (4.4.0-1073.77)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream
Released (5.7~rc4)
xenial
Released (4.4.0-1109.120)
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 (5.7~rc4)
xenial Does not exist

linux-aws-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 (5.7~rc4)
xenial Does not exist

linux-aws-5.4
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.4.0-1018.18~18.04.1)
focal Does not exist

trusty Does not exist

upstream
Released (5.7~rc4)
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 (5.7~rc4)
xenial
Released (4.15.0-1073.77~16.04.1)
linux-azure
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needs-triage)
eoan
Released (5.3.0-1028.29)
focal
Released (5.4.0-1016.16)
trusty
Released (4.15.0-1089.99~14.04.1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream
Released (5.7~rc4)
xenial
Released (4.15.0-1089.99~16.04.1)
linux-azure-4.15
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1089.99)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.7~rc4)
xenial Does not exist

linux-azure-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1028.29~18.04.1)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.7~rc4)
xenial Does not exist

linux-azure-5.4
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.4.0-1020.20~18.04.1)
focal Does not exist

trusty Does not exist

upstream
Released (5.7~rc4)
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 (5.7~rc4)
xenial Does not exist

linux-gcp
Launchpad, Ubuntu, Debian
bionic Ignored
(end of life, was needs-triage)
eoan
Released (5.3.0-1026.28)
focal
Released (5.4.0-1015.15)
trusty Does not exist

upstream
Released (5.7~rc4)
xenial
Released (4.15.0-1077.87~16.04.1)
linux-gcp-4.15
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1077.87)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.7~rc4)
xenial Does not exist

linux-gcp-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1026.28~18.04.1)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.7~rc4)
xenial Does not exist

linux-gcp-5.4
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.4.0-1019.19~18.04.2)
focal Does not exist

trusty Does not exist

upstream
Released (5.7~rc4)
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 (5.7~rc4)
xenial Does not exist

linux-gke-4.15
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1063.66)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.7~rc4)
xenial Does not exist

linux-gke-5.0
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1042.43)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.7~rc4)
xenial Does not exist

linux-gke-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1026.28~18.04.1)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.7~rc4)
xenial Does not exist

linux-hwe-5.4
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.4.0-37.41~18.04.1)
focal Does not exist

trusty Does not exist

upstream
Released (5.7~rc4)
xenial Does not exist

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

eoan Does not exist

focal
Released (5.6.0-1011.11)
trusty Does not exist

upstream
Released (5.7~rc4)
xenial Does not exist

linux-oem-osp1
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1059.64)
eoan Ignored
(end of life)
focal Does not exist

trusty Does not exist

upstream
Released (5.7~rc4)
xenial Does not exist

linux-oracle
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1045.49)
eoan
Released (5.3.0-1024.26)
focal
Released (5.4.0-1015.15)
trusty Does not exist

upstream
Released (5.7~rc4)
xenial
Released (4.15.0-1045.49~16.04.1)
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 (5.7~rc4)
xenial Does not exist

linux-oracle-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1024.26~18.04.1)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.7~rc4)
xenial Does not exist

linux-oracle-5.4
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.4.0-1019.19~18.04.1)
focal Does not exist

trusty Does not exist

upstream
Released (5.7~rc4)
xenial Does not exist

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

eoan Does not exist

focal
Released (5.4.0-1012.12)
trusty Does not exist

upstream
Released (5.7~rc4)
xenial Does not exist

linux-raspi-5.4
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.4.0-1013.13~18.04.1)
focal Does not exist

trusty Does not exist

upstream
Released (5.7~rc4)
xenial Does not exist

linux-raspi2
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1063.67)
eoan
Released (5.3.0-1027.29)
focal Ignored
(end of life, was needs-triage)
trusty Does not exist

upstream
Released (5.7~rc4)
xenial
Released (4.4.0-1134.143)
linux-raspi2-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1027.29~18.04.1)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.7~rc4)
xenial Does not exist

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

eoan Does not exist

focal
Released (5.4.0-27.31)
trusty Does not exist

upstream
Released (5.7~rc4)
xenial Does not exist

linux-snapdragon
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1080.87)
eoan Does not exist

focal Does not exist

trusty Does not exist

upstream
Released (5.7~rc4)
xenial
Released (4.4.0-1138.146)

Severity score breakdown

Parameter Value
Base score 4.7
Attack vector Local
Attack complexity High
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H