CVE-2018-20784

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.
Infinite Loop
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
9.8 CRITICAL
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 65%
Affected Products (NVD)
VendorProductVersion
linuxlinux_kernel
4.13 ≤
𝑥
< 4.14.93
linuxlinux_kernel
4.19 ≤
𝑥
< 4.19.15
linuxlinux_kernel
4.20 ≤
𝑥
< 4.20.2
linuxlinux_kernel
5.0:rc1
canonicalubuntu_linux
14.04
canonicalubuntu_linux
16.04
canonicalubuntu_linux
18.04
redhatenterprise_linux
8.0
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
linux
bookworm
6.1.106-3
fixed
bookworm (security)
6.1.112-1
fixed
bullseye
5.10.223-1
fixed
bullseye (security)
5.10.226-1
fixed
jessie
not-affected
sid
6.11.6-1
fixed
stretch
not-affected
trixie
6.11.5-1
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
linux
bionic
Fixed 4.15.0-60.67
released
cosmic
ignored
disco
not-affected
eoan
not-affected
trusty
not-affected
xenial
Fixed 4.4.0-170.199
released
linux-aws
bionic
Fixed 4.15.0-1047.49
released
cosmic
ignored
disco
not-affected
eoan
not-affected
trusty
Fixed 4.4.0-1059.63
released
xenial
Fixed 4.4.0-1099.110
released
linux-aws-5.0
bionic
not-affected
disco
dne
eoan
dne
trusty
dne
xenial
dne
linux-aws-hwe
bionic
dne
cosmic
dne
disco
dne
eoan
dne
trusty
dne
xenial
Fixed 4.15.0-1047.49~16.04.1
released
linux-azure
bionic
Fixed 5.0.0-1014.14~18.04.1
released
cosmic
ignored
disco
not-affected
eoan
not-affected
trusty
ignored
xenial
Fixed 4.15.0-1056.61
released
linux-azure-5.3
bionic
not-affected
disco
dne
eoan
dne
trusty
dne
xenial
dne
linux-azure-edge
bionic
Fixed 5.0.0-1014.14~18.04.1
released
cosmic
dne
disco
dne
eoan
dne
trusty
dne
xenial
Fixed 4.15.0-1056.61
released
linux-euclid
bionic
dne
cosmic
dne
disco
dne
eoan
dne
trusty
dne
xenial
ignored
linux-flo
bionic
dne
cosmic
dne
disco
dne
eoan
dne
trusty
dne
xenial
ignored
linux-gcp
bionic
Fixed 4.15.0-1042.45
released
cosmic
ignored
disco
not-affected
eoan
not-affected
trusty
dne
xenial
Fixed 4.15.0-1041.43
released
linux-gcp-5.3
bionic
not-affected
disco
dne
eoan
dne
trusty
dne
xenial
dne
linux-gcp-edge
bionic
Fixed 4.15.0-1042.45
released
cosmic
dne
disco
dne
eoan
dne
trusty
dne
xenial
dne
linux-gke
bionic
dne
cosmic
dne
disco
dne
eoan
dne
trusty
dne
xenial
ignored
linux-gke-4.15
bionic
Fixed 4.15.0-1041.43
released
disco
dne
eoan
dne
trusty
dne
xenial
dne
linux-gke-5.0
bionic
not-affected
disco
dne
eoan
dne
trusty
dne
xenial
dne
linux-goldfish
bionic
dne
cosmic
dne
disco
dne
eoan
dne
trusty
dne
xenial
ignored
linux-grouper
bionic
dne
cosmic
dne
disco
dne
eoan
dne
trusty
dne
xenial
dne
linux-hwe
bionic
Fixed 5.0.0-23.24~18.04.1
released
cosmic
dne
disco
dne
eoan
dne
trusty
dne
xenial
Fixed 4.15.0-60.67~16.04.1
released
linux-hwe-edge
bionic
not-affected
cosmic
dne
disco
dne
eoan
dne
trusty
dne
xenial
Fixed 4.15.0-60.67~16.04.1
released
linux-kvm
bionic
Fixed 4.15.0-1043.43
released
cosmic
ignored
disco
not-affected
eoan
not-affected
trusty
dne
xenial
Fixed 4.4.0-1063.70
released
linux-lts-trusty
bionic
dne
cosmic
dne
disco
dne
eoan
dne
trusty
dne
xenial
dne
linux-lts-utopic
bionic
dne
cosmic
dne
disco
dne
eoan
dne
trusty
ignored
xenial
dne
linux-lts-vivid
bionic
dne
cosmic
dne
disco
dne
eoan
dne
trusty
ignored
xenial
dne
linux-lts-wily
bionic
dne
cosmic
dne
disco
dne
eoan
dne
trusty
ignored
xenial
dne
linux-lts-xenial
bionic
dne
cosmic
dne
disco
dne
eoan
dne
trusty
Fixed 4.4.0-170.199~14.04.1
released
xenial
dne
linux-maguro
bionic
dne
cosmic
dne
disco
dne
eoan
dne
trusty
dne
xenial
dne
linux-mako
bionic
dne
cosmic
dne
disco
dne
eoan
dne
trusty
dne
xenial
ignored
linux-manta
bionic
dne
cosmic
dne
disco
dne
eoan
dne
trusty
dne
xenial
dne
linux-oem
bionic
Fixed 4.15.0-1056.65
released
cosmic
ignored
disco
ignored
eoan
Fixed 4.15.0-1059.68
released
trusty
dne
xenial
ignored
linux-oem-5.4
bionic
dne
eoan
dne
trusty
dne
xenial
dne
linux-oem-osp1
bionic
not-affected
disco
not-affected
eoan
not-affected
trusty
dne
xenial
dne
linux-oracle
bionic
Fixed 4.15.0-1022.25
released
cosmic
ignored
disco
Fixed 5.0.0-1004.8
released
eoan
not-affected
trusty
dne
xenial
Fixed 4.15.0-1022.25~16.04.1
released
linux-oracle-5.0
bionic
not-affected
disco
dne
eoan
dne
trusty
dne
xenial
dne
linux-raspi2
bionic
Fixed 4.15.0-1044.47
released
cosmic
ignored
disco
not-affected
eoan
not-affected
trusty
dne
xenial
Fixed 4.4.0-1126.135
released
linux-raspi2-5.3
bionic
not-affected
eoan
dne
trusty
dne
xenial
dne
linux-snapdragon
bionic
Fixed 4.15.0-1062.69
released
cosmic
dne
disco
not-affected
eoan
dne
trusty
dne
xenial
Fixed 4.4.0-1130.138
released
openSUSE logo
openSUSE / SLES Releases
openSUSE Product
Release
kernel-default
suse enterprise server 12 SP3
4.4.180-94.194.1
fixed
kernel-default-base
suse enterprise server 12 SP3
4.4.180-94.194.1
fixed
kernel-default-kgraft
suse enterprise server 12 SP3
4.4.180-94.164.3
fixed
kernel-default-man
suse enterprise server 12 SP3
4.4.180-94.164.3
fixed
kernel-macros
suse enterprise server 12 SP3
4.4.180-94.194.1
fixed
kernel-source
suse enterprise server 12 SP3
4.4.180-94.194.1
fixed
kernel-syms
suse enterprise server 12 SP3
4.4.180-94.194.1
fixed
kgraft-patch-4_4_180-94_164-default-1
suse enterprise server 12 SP3
4.3.2
fixed
Red Hat logo
Red Hat Enterprise Linux Releases
Red Hat Product
Release
bpftool
RHEL 8
0:4.18.0-80.7.1.el8_0
fixed
RHEL 8.0 E4S
0:4.18.0-80.7.1.el8_0
fixed
kernel
RHEL 8
0:4.18.0-80.7.1.el8_0
fixed
RHEL 8.0 E4S
0:4.18.0-80.7.1.el8_0
fixed
kernel-abi-whitelists
RHEL 8
0:4.18.0-80.7.1.el8_0
fixed
RHEL 8.0 E4S
0:4.18.0-80.7.1.el8_0
fixed
kernel-core
RHEL 8
0:4.18.0-80.7.1.el8_0
fixed
RHEL 8.0 E4S
0:4.18.0-80.7.1.el8_0
fixed
kernel-debug
RHEL 8
0:4.18.0-80.7.1.el8_0
fixed
RHEL 8.0 E4S
0:4.18.0-80.7.1.el8_0
fixed
kernel-debug-core
RHEL 8
0:4.18.0-80.7.1.el8_0
fixed
RHEL 8.0 E4S
0:4.18.0-80.7.1.el8_0
fixed
kernel-debug-devel
RHEL 8
0:4.18.0-80.7.1.el8_0
fixed
RHEL 8.0 E4S
0:4.18.0-80.7.1.el8_0
fixed
kernel-debug-modules
RHEL 8
0:4.18.0-80.7.1.el8_0
fixed
RHEL 8.0 E4S
0:4.18.0-80.7.1.el8_0
fixed
kernel-debug-modules-extra
RHEL 8
0:4.18.0-80.7.1.el8_0
fixed
RHEL 8.0 E4S
0:4.18.0-80.7.1.el8_0
fixed
kernel-devel
RHEL 8
0:4.18.0-80.7.1.el8_0
fixed
RHEL 8.0 E4S
0:4.18.0-80.7.1.el8_0
fixed
kernel-doc
RHEL 8
0:4.18.0-80.7.1.el8_0
fixed
RHEL 8.0 E4S
0:4.18.0-80.7.1.el8_0
fixed
kernel-modules
RHEL 8
0:4.18.0-80.7.1.el8_0
fixed
RHEL 8.0 E4S
0:4.18.0-80.7.1.el8_0
fixed
kernel-modules-extra
RHEL 8
0:4.18.0-80.7.1.el8_0
fixed
RHEL 8.0 E4S
0:4.18.0-80.7.1.el8_0
fixed
kernel-rt
RHEL 8
0:4.18.0-80.7.1.rt9.153.el8_0
fixed
RHEL 8.0 E4S
0:4.18.0-80.7.1.rt9.153.el8_0
fixed
kernel-rt-core
RHEL 8
0:4.18.0-80.7.1.rt9.153.el8_0
fixed
RHEL 8.0 E4S
0:4.18.0-80.7.1.rt9.153.el8_0
fixed
kernel-rt-debug
RHEL 8
0:4.18.0-80.7.1.rt9.153.el8_0
fixed
RHEL 8.0 E4S
0:4.18.0-80.7.1.rt9.153.el8_0
fixed
kernel-rt-debug-core
RHEL 8
0:4.18.0-80.7.1.rt9.153.el8_0
fixed
RHEL 8.0 E4S
0:4.18.0-80.7.1.rt9.153.el8_0
fixed
kernel-rt-debug-devel
RHEL 8
0:4.18.0-80.7.1.rt9.153.el8_0
fixed
RHEL 8.0 E4S
0:4.18.0-80.7.1.rt9.153.el8_0
fixed
kernel-rt-debug-kvm
RHEL 8
0:4.18.0-80.7.1.rt9.153.el8_0
fixed
RHEL 8.0 E4S
0:4.18.0-80.7.1.rt9.153.el8_0
fixed
kernel-rt-debug-modules
RHEL 8
0:4.18.0-80.7.1.rt9.153.el8_0
fixed
RHEL 8.0 E4S
0:4.18.0-80.7.1.rt9.153.el8_0
fixed
kernel-rt-debug-modules-extra
RHEL 8
0:4.18.0-80.7.1.rt9.153.el8_0
fixed
RHEL 8.0 E4S
0:4.18.0-80.7.1.rt9.153.el8_0
fixed
kernel-rt-devel
RHEL 8
0:4.18.0-80.7.1.rt9.153.el8_0
fixed
RHEL 8.0 E4S
0:4.18.0-80.7.1.rt9.153.el8_0
fixed
kernel-rt-kvm
RHEL 8
0:4.18.0-80.7.1.rt9.153.el8_0
fixed
RHEL 8.0 E4S
0:4.18.0-80.7.1.rt9.153.el8_0
fixed
kernel-rt-modules
RHEL 8
0:4.18.0-80.7.1.rt9.153.el8_0
fixed
RHEL 8.0 E4S
0:4.18.0-80.7.1.rt9.153.el8_0
fixed
kernel-rt-modules-extra
RHEL 8
0:4.18.0-80.7.1.rt9.153.el8_0
fixed
RHEL 8.0 E4S
0:4.18.0-80.7.1.rt9.153.el8_0
fixed
kernel-tools
RHEL 8
0:4.18.0-80.7.1.el8_0
fixed
RHEL 8.0 E4S
0:4.18.0-80.7.1.el8_0
fixed
kernel-tools-libs
RHEL 8
0:4.18.0-80.7.1.el8_0
fixed
RHEL 8.0 E4S
0:4.18.0-80.7.1.el8_0
fixed
kernel-tools-libs-devel
RHEL 8
0:4.18.0-80.7.1.el8_0
fixed
RHEL 8.0 E4S
0:4.18.0-80.7.1.el8_0
fixed
kernel-zfcpdump
RHEL 8
0:4.18.0-80.7.1.el8_0
fixed
RHEL 8.0 E4S
0:4.18.0-80.7.1.el8_0
fixed
kernel-zfcpdump-core
RHEL 8
0:4.18.0-80.7.1.el8_0
fixed
RHEL 8.0 E4S
0:4.18.0-80.7.1.el8_0
fixed
kernel-zfcpdump-devel
RHEL 8
0:4.18.0-80.7.1.el8_0
fixed
RHEL 8.0 E4S
0:4.18.0-80.7.1.el8_0
fixed
kernel-zfcpdump-modules
RHEL 8
0:4.18.0-80.7.1.el8_0
fixed
RHEL 8.0 E4S
0:4.18.0-80.7.1.el8_0
fixed
kernel-zfcpdump-modules-extra
RHEL 8
0:4.18.0-80.7.1.el8_0
fixed
RHEL 8.0 E4S
0:4.18.0-80.7.1.el8_0
fixed
perf
RHEL 8
0:4.18.0-80.7.1.el8_0
fixed
RHEL 8.0 E4S
0:4.18.0-80.7.1.el8_0
fixed
python3-perf
RHEL 8
0:4.18.0-80.7.1.el8_0
fixed
RHEL 8.0 E4S
0:4.18.0-80.7.1.el8_0
fixed
Common Weakness Enumeration
References
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c40f7d74c741a907cfaeb73a7697081881c497d0
https://access.redhat.com/errata/RHSA-2019:1959
https://access.redhat.com/errata/RHSA-2019:1971
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.20.2
https://github.com/torvalds/linux/commit/c40f7d74c741a907cfaeb73a7697081881c497d0
https://usn.ubuntu.com/4115-1/
https://usn.ubuntu.com/4118-1/
https://usn.ubuntu.com/4211-1/
https://usn.ubuntu.com/4211-2/
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c40f7d74c741a907cfaeb73a7697081881c497d0
https://access.redhat.com/errata/RHSA-2019:1959
https://access.redhat.com/errata/RHSA-2019:1971
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.20.2
https://github.com/torvalds/linux/commit/c40f7d74c741a907cfaeb73a7697081881c497d0
https://usn.ubuntu.com/4115-1/
https://usn.ubuntu.com/4118-1/
https://usn.ubuntu.com/4211-1/
https://usn.ubuntu.com/4211-2/