CVE-2021-20317

Aliases:UBUNTU-CVE-2021-20317DEBIAN-CVE-2021-20317
Advisory lineage Upstream: 0 Downstream: 13
Modified
Published: 27 Sept 2021, 10:34
Last modified:03 Aug 2024, 17:37

Vulnerability Summary

Overall Risk (default)
low
20/100
CVSS Score
4.9 MEDIUM
v2.0 (nvd)
EPSS Score
0.4% LOW
0% probability +0.38%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

27 Sept 2021, 10:34
Published
Vulnerability first disclosed
03 Aug 2024, 17:37
Last Modified
Vulnerability information updated

Description

A flaw was found in the Linux kernel. A corrupted timer tree caused the task wakeup to be missing in the timerqueue_add function in lib/timerqueue.c. This flaw allows a local attacker with special user privileges to cause a denial of service, slowing and eventually stopping the system while running OSP.

CVSS Metrics

  • v3.1•MEDIUM•Score: 4.4CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
  • v2.0•MEDIUM•Score: 4.9AV:L/AC:L/Au:N/C:N/I:N/A:C

EPSS Trends

Current EPSS score: 0.40%• Percentile: 34%

Techniques & Countermeasures

  • CWE-665•Improper Initialization

    The product does not initialize or incorrectly initializes a resource, which might leave the resource in an unexpected state when it is accessed or used.

Affected Systems

  • debian•linux

    < 5.4.6-1 | < 5.4.6-1 | < 5.4.6-1 | < 5.4.6-1

  • ubuntu•linux

    all | < 4.4.0-222.255 | < 4.15.0-166.174

  • ubuntu•linux-aws

    < 4.4.0-1102.107 | < 4.4.0-1138.152 | < 4.15.0-1118.125

  • ubuntu•linux-aws-5.0

    all

  • ubuntu•linux-aws-5.3

    all

  • ubuntu•linux-aws-5.8

    all

  • ubuntu•linux-aws-fips

    < 4.15.0-2059.61 | all

  • ubuntu•linux-aws-hwe

    < 4.15.0-1118.125~16.04.1

  • ubuntu•linux-azure

    < 4.15.0-1129.142~14.04.1 | < 4.15.0-1129.142~16.04.1 | all

  • ubuntu•linux-azure-4.15

    < 4.15.0-1129.142

  • ubuntu•linux-azure-5.3

    all

  • ubuntu•linux-azure-edge

    all

  • ubuntu•linux-azure-fde-5.15

    < 5.15.0-1114.123~20.04.1

  • ubuntu•linux-azure-fips

    < 4.15.0-2041.45 | all

  • ubuntu•linux-bluefield

    all

  • ubuntu•linux-dell300x

    < 4.15.0-1033.38

  • ubuntu•linux-fips

    < 4.4.0-1072.78 | all | < 4.15.0-1075.84

  • ubuntu•linux-gcp

    < 4.15.0-1114.128~16.04.1 | all

  • ubuntu•linux-gcp-4.15

    < 4.15.0-1114.128

  • ubuntu•linux-gcp-5.3

    all

  • ubuntu•linux-gcp-5.8

    all

  • ubuntu•linux-gcp-edge

    all

  • ubuntu•linux-gcp-fips

    < 4.15.0-2024.26 | all

  • ubuntu•linux-gke-4.15

    all

  • ubuntu•linux-hwe

    < 4.15.0-166.174~16.04.1 | all

  • ubuntu•linux-hwe-edge

    all | all

  • ubuntu•linux-intel-iot-realtime

    all

  • ubuntu•linux-kvm

    < 4.4.0-1103.112 | < 4.15.0-1105.107

  • ubuntu•linux-lts-xenial

    < 4.4.0-222.255~14.04.1

  • ubuntu•linux-oem

    all

  • ubuntu•linux-oem-5.6

    all

  • ubuntu•linux-oracle

    < 4.15.0-1085.93~16.04.1 | < 4.15.0-1085.93

  • ubuntu•linux-oracle-5.0

    all

  • ubuntu•linux-oracle-5.3

    all

  • ubuntu•linux-oracle-5.8

    all

  • ubuntu•linux-raspi-realtime

    all

  • ubuntu•linux-raspi2

    < 4.15.0-1101.108 | all

  • ubuntu•linux-realtime

    all

  • ubuntu•linux-riscv

    all

  • ubuntu•linux-riscv-5.8

    all

  • ubuntu•linux-snapdragon

    < 4.15.0-1118.127

  • debian•debian_linux

    9.0 | 10.0

  • linux•linux_kernel

    < 5.4 | 5.4

References (12)