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CVE-2018-20784

Published: 22 February 2019

In the Linux kernel before 4.20.2, kernel/sched/fair.c mishandles leaf cfs_rq's, which allows attackers to cause a denial of service (infinite loop in update_blocked_averages) or possibly have unspecified other impact by inducing a high load.

From the Ubuntu Security Team

Zhipeng Xie discovered that an infinite loop could be triggered in the CFS Linux kernel process scheduler. A local attacker could possibly use this to cause a denial of service.

Priority

Medium

CVSS 3 base score: 9.8

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-60.67)
cosmic Ignored
(reached end-of-life)
disco Not vulnerable
(4.19.0-12.13)
eoan Not vulnerable
(5.0.0-13.14)
precise Ignored
(was needed ESM criteria)
trusty Not vulnerable
(3.11.0-12.19)
upstream
Released (5.0~rc1)
xenial
Released (4.4.0-170.199)
Patches:
Introduced by

a9e7f6544b9cebdae54d29f87a7ba2a83c0471b5

Fixed by c40f7d74c741a907cfaeb73a7697081881c497d0
linux-aws
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1047.49)
cosmic Ignored
(reached end-of-life)
disco Not vulnerable
(5.0.0-1001.1)
eoan Not vulnerable
(5.0.0-1004.4)
precise Does not exist

trusty
Released (4.4.0-1059.63)
upstream
Released (5.0~rc1)
xenial
Released (4.4.0-1099.110)
linux-aws-5.0
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.0.0-1021.24~18.04.1)
disco Does not exist

eoan Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial Does not exist

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

cosmic Does not exist

disco Does not exist

eoan Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial
Released (4.15.0-1047.49~16.04.1)
linux-azure
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1014.14~18.04.1)
cosmic Ignored
(reached end-of-life)
disco Not vulnerable
(5.0.0-1001.1)
eoan Not vulnerable
(5.0.0-1004.4)
precise Does not exist

trusty Ignored
(was needed ESM criteria)
upstream
Released (5.0~rc1)
xenial
Released (4.15.0-1056.61)
linux-azure-5.3
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.3.0-1007.8~18.04.1)
disco Does not exist

eoan Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial Does not exist

linux-azure-edge
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1014.14~18.04.1)
cosmic Does not exist

disco Does not exist

eoan Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial
Released (4.15.0-1056.61)
linux-euclid
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

eoan Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial Ignored
(was needed ESM criteria)
linux-flo
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

eoan Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (5.0~rc1)
xenial Ignored
(abandoned)
linux-gcp
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1042.45)
cosmic Ignored
(reached end-of-life)
disco Not vulnerable
(5.0.0-1001.1)
eoan Not vulnerable
(5.0.0-1004.4)
precise Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial
Released (4.15.0-1041.43)
linux-gcp-5.3
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.3.0-1008.9~18.04.1)
disco Does not exist

eoan Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial Does not exist

linux-gcp-edge
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1042.45)
cosmic Does not exist

disco Does not exist

eoan Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial Does not exist

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

cosmic Does not exist

disco Does not exist

eoan Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial Ignored
(end-of-life)
linux-gke-4.15
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1041.43)
disco Does not exist

eoan Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial Does not exist

linux-gke-5.0
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.0.0-1011.11~18.04.1)
disco Does not exist

eoan Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial Does not exist

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

cosmic Does not exist

disco Does not exist

eoan Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (5.0~rc1)
xenial Ignored
(end-of-life)
linux-grouper
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

eoan Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (5.0~rc1)
xenial Does not exist

linux-hwe
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-23.24~18.04.1)
cosmic Does not exist

disco Does not exist

eoan Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial
Released (4.15.0-60.67~16.04.1)
linux-hwe-edge
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.0.0-15.16~18.04.1)
cosmic Does not exist

disco Does not exist

eoan Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial
Released (4.15.0-60.67~16.04.1)
linux-kvm
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1043.43)
cosmic Ignored
(reached end-of-life)
disco Not vulnerable
(5.0.0-1001.1)
eoan Not vulnerable
(5.0.0-1004.4)
precise Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial
Released (4.4.0-1063.70)
linux-lts-trusty
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

eoan Does not exist

precise Ignored
(was needed ESM criteria)
trusty Does not exist

upstream
Released (5.0~rc1)
xenial Does not exist

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

cosmic Does not exist

disco Does not exist

eoan Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [end-of-life])
upstream
Released (5.0~rc1)
xenial Does not exist

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

cosmic Does not exist

disco Does not exist

eoan Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [end-of-life])
upstream
Released (5.0~rc1)
xenial Does not exist

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

cosmic Does not exist

disco Does not exist

eoan Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [end-of-life])
upstream
Released (5.0~rc1)
xenial Does not exist

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

cosmic Does not exist

disco Does not exist

eoan Does not exist

precise Does not exist

trusty
Released (4.4.0-170.199~14.04.1)
upstream
Released (5.0~rc1)
xenial Does not exist

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

cosmic Does not exist

disco Does not exist

eoan Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (5.0~rc1)
xenial Does not exist

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

cosmic Does not exist

disco Does not exist

eoan Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (5.0~rc1)
xenial Ignored
(abandoned)
linux-manta
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

eoan Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (5.0~rc1)
xenial Does not exist

linux-oem
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1056.65)
cosmic Ignored
(reached end-of-life)
disco Ignored
(was pending \[4.15.0-1056.65\] now end-of-life)
eoan
Released (4.15.0-1059.68)
precise Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial Ignored
(was needs-triage now end-of-life)
linux-oem-5.4
Launchpad, Ubuntu, Debian
bionic Does not exist

eoan Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial Does not exist

linux-oem-osp1
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.0.0-1010.11)
disco Not vulnerable
(5.0.0-1010.11)
eoan Not vulnerable
(5.0.0-1010.11)
precise Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial Does not exist

linux-oracle
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1022.25)
cosmic Ignored
(reached end-of-life)
disco
Released (5.0.0-1004.8)
eoan Not vulnerable
(5.3.0-1002.2)
precise Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial
Released (4.15.0-1022.25~16.04.1)
linux-oracle-5.0
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.0.0-1007.12~18.04.1)
disco Does not exist

eoan Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial Does not exist

linux-raspi2
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1044.47)
cosmic Ignored
(reached end-of-life)
disco Not vulnerable
(5.0.0-1004.4)
eoan Not vulnerable
(5.0.0-1006.6)
precise Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial
Released (4.4.0-1126.135)
linux-raspi2-5.3
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.3.0-1017.19~18.04.1)
eoan Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial Does not exist

linux-snapdragon
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1062.69)
cosmic Does not exist

disco Not vulnerable
(5.0.0-1010.10)
eoan Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.0~rc1)
xenial
Released (4.4.0-1130.138)