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CVE-2020-29368

Published: 28 November 2020

An issue was discovered in __split_huge_pmd in mm/huge_memory.c in the Linux kernel before 5.7.5. The copy-on-write implementation can grant unintended write access because of a race condition in a THP mapcount check, aka CID-c444eb564fb1.

From the Ubuntu Security Team

Jann Horn discovered a race condition in the copy-on-write implementation in the Linux kernel when handling hugepages. A local attacker could use this to gain unintended write access to read-only memory pages.

Priority

Medium

Cvss 3 Severity Score

7.0

Score breakdown

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-115.116)
groovy Not vulnerable
(5.8.0-16.17)
trusty Ignored
(was needs-triage ESM criteria)
upstream
Released (5.8~rc1)
xenial Not vulnerable
(4.2.0-16.19)
focal
Released (5.4.0-45.49)
Patches:
Introduced by

6d0a07edd17cfc12fdc1f36de8072fa17cc3666f

Fixed by c444eb564fb16645c172d550359cb3d75fe8a040
linux-aws
Launchpad, Ubuntu, Debian
groovy Not vulnerable
(5.8.0-1004.4)
trusty Ignored
(was needs-triage ESM criteria)
upstream
Released (5.8~rc1)
xenial Not vulnerable
(4.4.0-1001.10)
bionic
Released (4.15.0-1080.84)
focal
Released (5.4.0-1022.22)
linux-aws-5.0
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-aws-5.3)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-aws-5.3
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-aws-5.4)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

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~rc1)
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~rc1)
xenial
Released (4.15.0-1080.84~16.04.1)
linux-azure
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-azure-5.3)
focal
Released (5.4.0-1023.23)
groovy Not vulnerable
(5.8.0-1004.4)
trusty Ignored
(was needs-triage ESM criteria)
upstream
Released (5.8~rc1)
xenial
Released (4.15.0-1093.103~16.04.1)
linux-azure-4.15
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1093.103)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-azure-5.3
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-azure-5.4)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
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~rc1)
xenial Does not exist

linux-azure-edge
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-azure-5.3)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-dell300x
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1005.8)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-gcp
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-gcp-5.3)
focal
Released (5.4.0-1022.22)
groovy Not vulnerable
(5.8.0-1002.2)
trusty Does not exist

upstream
Released (5.8~rc1)
xenial
Released (4.15.0-1081.92~16.04.1)
linux-gcp-4.15
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1081.92)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-gcp-5.3
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-gcp-5.4)
groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

focal 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~rc1)
xenial Does not exist

linux-gcp-edge
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-gcp-5.3)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-gke-4.15
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1067.70)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-gke-5.0
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1045.46)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-gke-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1032.34~18.04.1)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

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

trusty Does not exist

xenial Does not exist

focal Does not exist

bionic Not vulnerable
(5.4.0-1025.25~18.04.1)
upstream
Released (5.8~rc1)
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~rc1)
xenial Does not exist

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

groovy Does not exist

trusty Does not exist

xenial Does not exist

bionic Not vulnerable
(5.4.0-1001.1)
upstream
Released (5.8~rc1)
linux-hwe
Launchpad, Ubuntu, Debian
bionic Ignored
(replaced by linux-hwe-5.4)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial
Released (4.15.0-115.116~16.04.1)
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~rc1)
xenial Does not exist

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

focal Not vulnerable
(5.8.0-23.24~20.04.1)
groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-hwe-edge
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-hwe-5.4)
groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Ignored
(superseded by linux-hwe)
focal Does not exist

linux-kvm
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1072.73)
focal
Released (5.4.0-1021.21)
groovy Not vulnerable
(5.8.0-1001.1)
trusty Does not exist

upstream
Released (5.8~rc1)
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~rc1)
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~rc1)
xenial Does not exist

linux-oem
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1094.104)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Ignored
(end of standard support)
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~rc1)
xenial Does not exist

linux-oem-5.6
Launchpad, Ubuntu, Debian
focal
Released (5.6.0-1048.52)
groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

bionic Does not exist

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

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-oracle
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1051.55)
focal
Released (5.4.0-1022.22)
trusty Does not exist

upstream
Released (5.8~rc1)
xenial
Released (4.15.0-1051.55~16.04.1)
groovy Not vulnerable
(5.8.0-1001.1)
linux-oracle-5.0
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-oracle-5.3)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Does not exist

linux-oracle-5.3
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-oracle-5.4)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
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~rc1)
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~rc1)
xenial Does not exist

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

upstream
Released (5.8~rc1)
focal Does not exist

trusty Does not exist

xenial Does not exist

linux-raspi2
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1068.72)
focal Ignored
(replaced by linux-raspi)
groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Not vulnerable
(4.2.0-1013.19)
linux-raspi2-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1030.32~18.04.2)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
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~rc1)
xenial Does not exist

linux-snapdragon
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1084.92)
focal Does not exist

groovy Does not exist

trusty Does not exist

upstream
Released (5.8~rc1)
xenial Not vulnerable
(4.4.0-1013.15)

Severity score breakdown

Parameter Value
Base score 7.0
Attack vector Local
Attack complexity High
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H