CVE-2018-20784
First published: Fri Dec 28 2018(Updated: )
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.
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel-rt | <0:4.18.0-80.7.1.rt9.153.el8_0 | 0:4.18.0-80.7.1.rt9.153.el8_0 |
| redhat/kernel | <0:4.18.0-80.7.1.el8_0 | 0:4.18.0-80.7.1.el8_0 |
| Linux Linux kernel | >=4.13<4.14.93 | |
| Linux Linux kernel | >=4.19<4.19.15 | |
| Linux Linux kernel | >=4.20<4.20.2 | |
| Linux Linux kernel | =5.0-rc1 | |
| Canonical Ubuntu Linux | =14.04 | |
| Canonical Ubuntu Linux | =16.04 | |
| Canonical Ubuntu Linux | =18.04 | |
| Redhat Enterprise Linux | =8.0 | |
| Redhat Enterprise Linux For Real Time | =8 | |
| ubuntu/linux | <4.15.0-60.67 | 4.15.0-60.67 |
| ubuntu/linux | <5.0~ | 5.0~ |
| ubuntu/linux | <4.4.0-170.199 | 4.4.0-170.199 |
| ubuntu/linux-aws | <4.15.0-1047.49 | 4.15.0-1047.49 |
| ubuntu/linux-aws | <4.4.0-1059.63 | 4.4.0-1059.63 |
| ubuntu/linux-aws | <5.0~ | 5.0~ |
| ubuntu/linux-aws | <4.4.0-1099.110 | 4.4.0-1099.110 |
| ubuntu/linux-aws-5.0 | <5.0~ | 5.0~ |
| ubuntu/linux-aws-hwe | <5.0~ | 5.0~ |
| ubuntu/linux-aws-hwe | <4.15.0-1047.49~16.04.1 | 4.15.0-1047.49~16.04.1 |
| ubuntu/linux-azure | <5.0.0-1014.14~18.04.1 | 5.0.0-1014.14~18.04.1 |
| ubuntu/linux-azure | <5.0~ | 5.0~ |
| ubuntu/linux-azure | <4.15.0-1056.61 | 4.15.0-1056.61 |
| ubuntu/linux-azure-5.3 | <5.0~ | 5.0~ |
| ubuntu/linux-azure-edge | <5.0.0-1014.14~18.04.1 | 5.0.0-1014.14~18.04.1 |
| ubuntu/linux-azure-edge | <5.0~ | 5.0~ |
| ubuntu/linux-azure-edge | <4.15.0-1056.61 | 4.15.0-1056.61 |
| ubuntu/linux-euclid | <5.0~ | 5.0~ |
| ubuntu/linux-flo | <5.0~ | 5.0~ |
| ubuntu/linux-gcp | <4.15.0-1042.45 | 4.15.0-1042.45 |
| ubuntu/linux-gcp | <5.0~ | 5.0~ |
| ubuntu/linux-gcp | <4.15.0-1041.43 | 4.15.0-1041.43 |
| ubuntu/linux-gcp-5.3 | <5.0~ | 5.0~ |
| ubuntu/linux-gcp-edge | <4.15.0-1042.45 | 4.15.0-1042.45 |
| ubuntu/linux-gcp-edge | <5.0~ | 5.0~ |
| ubuntu/linux-gke | <5.0~ | 5.0~ |
| ubuntu/linux-gke-4.15 | <4.15.0-1041.43 | 4.15.0-1041.43 |
| ubuntu/linux-gke-4.15 | <5.0~ | 5.0~ |
| ubuntu/linux-gke-5.0 | <5.0~ | 5.0~ |
| ubuntu/linux-goldfish | <5.0~ | 5.0~ |
| ubuntu/linux-grouper | <5.0~ | 5.0~ |
| ubuntu/linux-hwe | <5.0.0-23.24~18.04.1 | 5.0.0-23.24~18.04.1 |
| ubuntu/linux-hwe | <5.0~ | 5.0~ |
| ubuntu/linux-hwe | <4.15.0-60.67~16.04.1 | 4.15.0-60.67~16.04.1 |
| ubuntu/linux-hwe-edge | <5.0~ | 5.0~ |
| ubuntu/linux-hwe-edge | <4.15.0-60.67~16.04.1 | 4.15.0-60.67~16.04.1 |
| ubuntu/linux-kvm | <4.15.0-1043.43 | 4.15.0-1043.43 |
| ubuntu/linux-kvm | <5.0~ | 5.0~ |
| ubuntu/linux-kvm | <4.4.0-1063.70 | 4.4.0-1063.70 |
| ubuntu/linux-lts-trusty | <5.0~ | 5.0~ |
| ubuntu/linux-lts-utopic | <5.0~ | 5.0~ |
| ubuntu/linux-lts-vivid | <5.0~ | 5.0~ |
| ubuntu/linux-lts-wily | <5.0~ | 5.0~ |
| ubuntu/linux-lts-xenial | <4.4.0-170.199~14.04.1 | 4.4.0-170.199~14.04.1 |
| ubuntu/linux-lts-xenial | <5.0~ | 5.0~ |
| ubuntu/linux-maguro | <5.0~ | 5.0~ |
| ubuntu/linux-mako | <5.0~ | 5.0~ |
| ubuntu/linux-manta | <5.0~ | 5.0~ |
| ubuntu/linux-oem | <4.15.0-1056.65 | 4.15.0-1056.65 |
| ubuntu/linux-oem | <4.15.0-1059.68 | 4.15.0-1059.68 |
| ubuntu/linux-oem | <5.0~ | 5.0~ |
| ubuntu/linux-oem-5.4 | <5.0~ | 5.0~ |
| ubuntu/linux-oem-osp1 | <5.0~ | 5.0~ |
| ubuntu/linux-oracle | <4.15.0-1022.25 | 4.15.0-1022.25 |
| ubuntu/linux-oracle | <5.0.0-1004.8 | 5.0.0-1004.8 |
| ubuntu/linux-oracle | <5.0~ | 5.0~ |
| ubuntu/linux-oracle | <4.15.0-1022.25~16.04.1 | 4.15.0-1022.25~16.04.1 |
| ubuntu/linux-oracle-5.0 | <5.0~ | 5.0~ |
| ubuntu/linux-raspi2 | <4.15.0-1044.47 | 4.15.0-1044.47 |
| ubuntu/linux-raspi2 | <5.0~ | 5.0~ |
| ubuntu/linux-raspi2 | <4.4.0-1126.135 | 4.4.0-1126.135 |
| ubuntu/linux-raspi2-5.3 | <5.0~ | 5.0~ |
| ubuntu/linux-snapdragon | <4.15.0-1062.69 | 4.15.0-1062.69 |
| ubuntu/linux-snapdragon | <5.0~ | 5.0~ |
| ubuntu/linux-snapdragon | <4.4.0-1130.138 | 4.4.0-1130.138 |
| debian/linux | 4.19.249-2 4.19.304-1 5.10.209-2 5.10.205-2 6.1.76-1 6.1.85-1 6.6.15-2 6.7.12-1 |
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Reference Links
- https://www.cve.org/CVERecord?id=CVE-2018-20784 https://nvd.nist.gov/vuln/detail/CVE-2018-20784
- https://bugzilla.redhat.com/show_bug.cgi?id=1680540
- https://access.redhat.com/errata/RHSA-2019:1971
- https://access.redhat.com/errata/RHSA-2019:1959
- https://access.redhat.com/security/cve/cve-2018-20784
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c40f7d74c741a907cfaeb73a7697081881c497d0
- 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/
- https://launchpad.net/bugs/cve/CVE-2018-20784
- https://lore.kernel.org/lkml/1545879866-27809-1-git-send-email-xiexiuqi@huawei.com/T/#u
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c40f7d74c741a907cfaeb73a7697081881c497d0
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1680544
- https://git.kernel.org/linus/c40f7d74c741a907cfaeb73a7697081881c497d0
- https://security-tracker.debian.org/tracker/CVE-2018-20784
- https://ubuntu.com/security/notices/USN-4115-1
- https://ubuntu.com/security/notices/USN-4118-1
- https://ubuntu.com/security/notices/USN-4211-1
- https://ubuntu.com/security/notices/USN-4211-2
- https://www.cve.org/CVERecord?id=CVE-2018-20784
- https://nvd.nist.gov/vuln/detail/CVE-2018-20784
- https://git.kernel.org/linus/a9e7f6544b9cebdae54d29f87a7ba2a83c0471b5
- https://ubuntu.com/security/CVE-2018-20784
Parent vulnerabilities
(Appears in the following advisories)
- collector/redhat-cve
- collector/nvd-index
- agent/type
- agent/remedy
- agent/last-modified-date
- agent/first-publish-date
- collector/launchpad-cve
- source/Launchpad
- collector/redhat-bugzilla
- source/Red Hat
- alias/CVE-2018-20784
- agent/author
- collector/nvd-cve
- source/NVD
- agent/software-canonical-lookup
- agent/severity
- agent/weakness
- agent/description
- agent/event
- agent/softwarecombine
- collector/usn-cve
- source/Ubuntu
- agent/references
- agent/tags
- collector/security-tracker-debian
- source/Debian
- package-manager/redhat
- vendor/linux
- canonical/linux linux kernel
- version/linux linux kernel/4.13
- version/linux linux kernel/4.19
- version/linux linux kernel/4.20
- version/linux linux kernel/5.0-rc1
- vendor/canonical
- canonical/canonical ubuntu linux
- version/canonical ubuntu linux/14.04
- version/canonical ubuntu linux/16.04
- version/canonical ubuntu linux/18.04
- vendor/redhat
- canonical/redhat enterprise linux
- version/redhat enterprise linux/8.0
- canonical/redhat enterprise linux for real time
- version/redhat enterprise linux for real time/8
- package-manager/ubuntu
- package-manager/debian