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CVE-2021-20317

Public on 2021-09-27
Modified on 2021-11-04
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. The highest threat from this vulnerability is system availability.

Severity
Medium
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CVSS v3 Base Score
4.4
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Affected Packages

Platform Package Release Date Advisory
Amazon Linux 2 - Core kernel 2021-10-28 23:22 ALAS2-2021-1719
Amazon Linux 2 - Microvm-kernel-4.14 Extra microvm-kernel 2023-09-14 04:27 ALAS2MICROVM-KERNEL-4.14-2023-001

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 4.4 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
NVD CVSSv2 4.9 AV:L/AC:L/Au:N/C:N/I:N/A:C
NVD CVSSv3 4.4 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

References

Red Hat: CVE-2021-20317 Mitre: CVE-2021-20317 FAQs regarding Amazon Linux ALAS/CVE Severity