CVE-2018-20784

Aliases:UBUNTU-CVE-2018-20784DEBIAN-CVE-2018-20784
Advisory lineage Upstream: 0 Downstream: 12
Modified
Published: 22 Feb 2019, 15:00
Last modified:05 Aug 2024, 12:12

Vulnerability Summary

Overall Risk (default)
high
70/100
CVSS Score
9.8 CRITICAL
v3.1 (nvd)
EPSS Score
4.17% LOW
4% probability +3.46%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

22 Feb 2019, 15:00
Published
Vulnerability first disclosed
05 Aug 2024, 12:12
Last Modified
Vulnerability information updated

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.

CVSS Metrics

  • v4.0•MEDIUM•Score: 5.7CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
  • v3.1•CRITICAL•Score: 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
  • v2.0•HIGH•Score: 7.5AV:N/AC:L/Au:N/C:P/I:P/A:P

EPSS Trends

Current EPSS score: 4.17%• Percentile: 90%

Techniques & Countermeasures

  • CWE-835•Loop with Unreachable Exit Condition ('Infinite Loop')

    The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.

Affected Systems

  • canonical•ubuntu_linux

    14.04 | 16.04 | 18.04

  • debian•linux

    < 4.19.16-1 | < 4.19.16-1 | < 4.19.16-1 | < 4.19.16-1

  • ubuntu•linux

    < 4.4.0-170.199 | < 4.15.0-60.67

  • ubuntu•linux-aws

    < 4.4.0-1059.63 | < 4.4.0-1099.110 | < 4.15.0-1047.49

  • ubuntu•linux-aws-fips

    < 4.15.0-2018.18 | all

  • ubuntu•linux-aws-hwe

    < 4.15.0-1047.49~16.04.1

  • ubuntu•linux-azure

    < 4.15.0-1059.64~14.04.1 | < 4.15.0-1056.61 | < 5.0.0-1014.14~18.04.1

  • ubuntu•linux-azure-fde

    all

  • ubuntu•linux-azure-fips

    < 4.15.0-2006.7 | all

  • ubuntu•linux-bluefield

    all

  • ubuntu•linux-fips

    < 4.4.0-1026.31 | all

  • ubuntu•linux-gcp

    < 4.15.0-1041.43 | < 4.15.0-1042.45

  • ubuntu•linux-gcp-fips

    all

  • ubuntu•linux-gke

    all

  • ubuntu•linux-gke-4.15

    < 4.15.0-1041.43

  • ubuntu•linux-hwe

    < 4.15.0-60.67~16.04.1 | < 5.0.0-23.24~18.04.1

  • ubuntu•linux-intel-iot-realtime

    all

  • ubuntu•linux-kvm

    < 4.4.0-1063.70 | < 4.15.0-1043.43

  • ubuntu•linux-lts-xenial

    < 4.4.0-170.199~14.04.1

  • ubuntu•linux-oem

    < 4.15.0-1056.65

  • ubuntu•linux-oracle

    < 4.15.0-1022.25~16.04.1 | < 4.15.0-1022.25

  • ubuntu•linux-raspi-realtime

    all

  • ubuntu•linux-raspi2

    < 4.4.0-1126.135 | < 4.15.0-1044.47

  • ubuntu•linux-realtime

    all

  • ubuntu•linux-riscv

    all | all

  • ubuntu•linux-snapdragon

    < 4.4.0-1130.138 | < 4.15.0-1062.69

  • linux•linux_kernel

    ≥ 4.13, < 4.14.93 | ≥ 4.19, < 4.19.15 | ≥ 4.20, < 4.20.2 | 5.0:rc1

  • redhat•enterprise_linux

    8.0

  • redhat•enterprise_linux_for_real_time

    8

References (17)