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CVE-2021-20321

Public on 2021-10-28
Modified on 2022-06-30
Description

A race condition accessing file object in the Linux kernel OverlayFS subsystem was found in the way users do rename in specific way with OverlayFS. A local user could use this flaw to crash the system.

Severity
Medium
See what this means
CVSS v3 Base Score
5.5
See breakdown

Affected Packages

Platform Package Release Date Advisory
Amazon Linux 2 - Core kernel 2021-10-28 23:22 ALAS2-2021-1719
Amazon Linux 2 - Kernel-5.10 Extra kernel 2022-01-20 23:56 ALAS2KERNEL-5.10-2022-007
Amazon Linux 2 - Kernel-5.4 Extra kernel 2022-07-19 16:02 ALAS2KERNEL-5.4-2022-031
Amazon Linux 2 - Kernel-5.4 Extra kernel 2022-06-30 22:29 ALAS2KERNEL-5.4-2022-027
Amazon Linux 2 - Kernel-5.4 Extra kernel 2022-07-11 14:43 ALAS2KERNEL-5.4-2022-029
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 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD CVSSv2 4.7 AV:L/AC:M/Au:N/C:N/I:N/A:C
NVD CVSSv3 4.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

References

Red Hat: CVE-2021-20321 Mitre: CVE-2021-20321 FAQs regarding Amazon Linux ALAS/CVE Severity