What is CVE-2021-20321?

CVE-2021-20321 is a Medium severity Linux kernel vulnerability with a CVSS score of 4.7 out of 10, classified as a Race Condition flaw (CWE-362). CVE-2021-20321 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-20321?

CVE-2021-20321 has a CVSS score of 4.7 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2021-20321?

No patch is currently available for CVE-2021-20321. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

Is CVE-2021-20321 actively exploited?

CVE-2021-20321 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Race Condition (CWE-362)?

The product contains a code sequence that can run concurrently with other code, creating unexpected states. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/362.html

CVE-2021-20321

Medium

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.

Package Linux Kernel

Published 2022-02-18

Last modified 2024-11-21

CVSS version 3.1

Patch available

Awaiting data

CVSS 3.1 score

4.7

out of 10

Medium

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

High

Vector string

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

Weakness type

CWE-362

CVE-2021-20321 is a Race Condition vulnerability

What is Race Condition?

The product contains a code sequence that can run concurrently with other code, creating unexpected states. Learn more on MITRE CWE

References

The following references provide additional information about CVE-2021-20321 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

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

Issue Tracking Third Party Advisory
Debian Security
https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html

Mailing List Third Party Advisory
Kernel.org
https://lore.kernel.org/all/20211011134508.748956131%40linuxfoundation.org/
Debian Security
https://www.debian.org/security/2022/dsa-5096

Third Party Advisory

Details

CVE ID CVE-2021-20321

Severity Medium

CVSS score 4.7 / 10

CVSS version 3.1

Published 2022-02-18

Modified 2024-11-21

KEV No

Patch Awaiting data

Package linux

Frequently asked questions

What is CVE-2021-20321?

CVE-2021-20321 is a Medium severity Linux kernel vulnerability with a CVSS score of 4.7 out of 10 , classified as a Race Condition flaw (CWE-362) . CVE-2021-20321 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-20321?

CVE-2021-20321 has a CVSS score of 4.7 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2021-20321?

No patch is currently available for CVE-2021-20321. Monitor the NIST NVD and your Linux distribution's security advisories for updates.
Is CVE-2021-20321 actively exploited?

No — CVE-2021-20321 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.
What is Race Condition (CWE-362)?

The product contains a code sequence that can run concurrently with other code, creating unexpected states. View CWE-362 on MITRE CWE →