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CVE-2021-20321

Date: February 18, 2022

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 Score

4.7

Related Resources (10)

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

Url: https://lore.kernel.org/all/20211011134508.748956131@linuxfoundation.org/

Url: https://people.canonical.com/~ubuntu-security/cve/CVE-2021-20321

Url: https://security-tracker.debian.org/tracker/CVE-2021-20321

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

Url: https://nvd.nist.gov/vuln/detail/CVE-2021-20321

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

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

Url: https://access.redhat.com/security/cve/CVE-2021-20321

Url: https://www.mend.io/vulnerability-database/CVE-2021-20321

Severity Score

4.7

Weakness Type (CWE)

Race Conditions

CWE-362

CVSS v3.1

Base Score:	4.7
Attack Vector (AV):	LOCAL
Attack Complexity (AC):	HIGH
Privileges Required (PR):	LOW
User Interaction (UI):	NONE
Scope (S):	UNCHANGED
Confidentiality (C):	NONE
Integrity (I):	NONE
Availability (A):	HIGH

CVSS v2

Base Score:	4.7
Access Vector (AV):	LOCAL
Access Complexity (AC):	MEDIUM
Authentication (AU):	NONE
Confidentiality (C):	NONE
Integrity (I):	NONE
Availability (A):	COMPLETE
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