CVE-2021-20321

MEDIUM

Linux Kernel < 5.15 - Denial of Service via OverlayFS File Rename Race Condition

Title source: llm
STIX 2.1

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 (4)

Core 4
Core References
Issue Tracking, Third Party Advisory x_refsource_misc
https://bugzilla.redhat.com/show_bug.cgi?id=2013242
Mailing List, Third Party Advisory mailing-list x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html
Third Party Advisory vendor-advisory x_refsource_debian
https://www.debian.org/security/2022/dsa-5096

Scores

CVSS v3 4.7
EPSS 0.0002
EPSS Percentile 5.4%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Details

CWE
CWE-362
Status published
Products (6)
debian/debian_linux 9.0
debian/debian_linux 10.0
linux/linux_kernel 5.15 (5 CPE variants)
linux/linux_kernel < 5.15
redhat/enterprise_linux 7.0
redhat/enterprise_linux 8.0
Published Feb 18, 2022
Tracked Since Feb 18, 2026