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
CVSS v3 Base Score
See breakdown
Affected Packages
| Platform | Package | Release Date | Advisory | Status |
|---|---|---|---|---|
| Amazon Linux 2 - Core | kernel | 2021-10-28 | ALAS2-2021-1719 | Fixed |
| Amazon Linux 2 - Kernel-5.10 Extra | kernel | 2022-01-20 | ALAS2KERNEL-5.10-2022-007 | Fixed |
| Amazon Linux 2 - Kernel-5.4 Extra | kernel | 2022-06-30 | ALAS2KERNEL-5.4-2022-027 | Fixed |
| Amazon Linux 2 - Kernel-5.4 Extra | kernel | 2022-07-11 | ALAS2KERNEL-5.4-2022-029 | Fixed |
| Amazon Linux 2 - Kernel-5.4 Extra | kernel | 2022-07-19 | ALAS2KERNEL-5.4-2022-031 | Fixed |
| Amazon Linux 2 - Microvm-kernel-4.14 Extra | microvm-kernel | 2023-09-14 | ALAS2MICROVM-KERNEL-4.14-2023-001 | Fixed |
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 |