CVE-2018-20784

CRITICAL
New! CVE Severity Now Using CVSS v3

The calculated severity for CVEs has been updated to use CVSS v3 by default. CVEs that do not have a CVSS v3 score will fall back CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Description

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.

References

https://github.com/torvalds/linux/commit/c40f7d74c741a907cfaeb73a7697081881c497d0

https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.20.2

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://usn.ubuntu.com/4115-1/

https://usn.ubuntu.com/4118-1/

https://usn.ubuntu.com/4211-2/

https://usn.ubuntu.com/4211-1/

Details

Source: MITRE

Published: 2019-02-22

Updated: 2021-06-02

Type: CWE-835

Risk Information

CVSS v2

Base Score: 7.5

Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P

Impact Score: 6.4

Exploitability Score: 10

Severity: HIGH

CVSS v3

Base Score: 9.8

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Impact Score: 5.9

Exploitability Score: 3.9

Severity: CRITICAL

Tenable Plugins

View all (9 total)

IDNameProductFamilySeverity
145675CentOS 8 : kernel (CESA-2019:1959)NessusCentOS Local Security Checks
critical
131565Ubuntu 16.04 LTS : linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon (USN-4211-1)NessusUbuntu Local Security Checks
critical
128680Ubuntu 16.04 LTS / 18.04 LTS : Linux kernel regression (USN-4115-2)NessusUbuntu Local Security Checks
critical
128478Ubuntu 16.04 LTS / 18.04 LTS : linux-aws vulnerabilities (USN-4118-1)NessusUbuntu Local Security Checks
critical
128475Ubuntu 16.04 LTS / 18.04 LTS : linux, linux-azure, linux-gcp, linux-gke-4.15, linux-hwe, linux-kvm, (USN-4115-1)NessusUbuntu Local Security Checks
critical
127976Oracle Linux 8 : kernel (ELSA-2019-1959)NessusOracle Linux Local Security Checks
critical
127641RHEL 8 : kernel-rt (RHSA-2019:1971)NessusRed Hat Local Security Checks
critical
127637RHEL 8 : kernel (RHSA-2019:1959)NessusRed Hat Local Security Checks
critical
124973EulerOS Virtualization for ARM 64 3.0.1.0 : kernel (EulerOS-SA-2019-1520)NessusHuawei Local Security Checks
critical