CVE-2021-20321
Public on 2021-10-28
Modified on 2025-09-16
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.
CVSS v3 Base Score
See breakdown
Affected Packages
| Platform | Package | Release Date | Advisory | Status |
|---|---|---|---|---|
| Amazon Linux 1 | kernel | Not Affected | ||
| Amazon Linux 2 - Kernel-5.15 Extra | kernel | Not Affected | ||
| Amazon Linux 2 - Core | kernel | 2021-11-04 | ALAS2-2021-1719 | Fixed |
| Amazon Linux 2 - Kernel-5.10 Extra | kernel | 2022-01-28 | ALAS2KERNEL-5.10-2022-007 | Fixed |
| Amazon Linux 2 - Kernel-5.4 Extra | kernel | 2022-01-28 | ALAS2KERNEL-5.4-2022-009 | Fixed |
| Amazon Linux 2 - Kernel-5.4 Extra | kernel | 2025-04-16 | ALAS2KERNEL-5.4-2025-099 | Fixed |
| Amazon Linux 2023 | kernel | Not Affected | ||
| Amazon Linux 2023 | kernel6.12 | Not Affected |
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 |