CVE-2021-20321

medium

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.

References

Advisories
More

https://www.debian.org/security/2022/dsa-5096

https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html

https://bugzilla.redhat.com/show_bug.cgi?id=2013242

https://lore.kernel.org/all/20211011134508.748956131%40linuxfoundation.org/

Details

Source: Mitre, NVD

Published: 2022-02-18

Updated: 2026-06-17

Risk Information

CVSS v2

Base Score: 4.7

Vector: CVSS2#AV:L/AC:M/Au:N/C:N/I:N/A:C

Severity: Medium

CVSS v3

Base Score: 4.7

Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H