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

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-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 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-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-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	bionic	Released (4.15.0-1067.68)
	eoan	Released (5.3.0-1023.25)
	focal	Released (5.4.0-1015.15)
	trusty	Does not exist
	upstream	Released (5.7~rc4)
	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-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

References

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