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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

Related Resources (10)

https://bugzilla.redhat.com/show_bug.cgi?id=2013242
https://lore.kernel.org/all/20211011134508.748956131@linuxfoundation.org/
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-20321
https://security-tracker.debian.org/tracker/CVE-2021-20321
https://lore.kernel.org/all/20211011134508.748956131%40linuxfoundation.org/
https://nvd.nist.gov/vuln/detail/CVE-2021-20321
https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html
https://www.debian.org/security/2022/dsa-5096
https://access.redhat.com/security/cve/CVE-2021-20321
https://www.mend.io/vulnerability-database/CVE-2021-20321

Severity Score

Weakness Type (CWE)

Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CWE-362

CVSS v3.1

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

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