CVE-2021-20321
MEDIUMCVSS 4.7/10EPSS 0.21%
Last modified
CVE-2021-20321 is a medium-severity vulnerability rated 4.7/10 on the CVSS scale. 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.. EPSS estimates a 0.21% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | < 5.15 |
| Linux | Linux Kernel | 5.15 |
| Redhat | Enterprise Linux | 7.0 |
| Redhat | Enterprise Linux | 8.0 |
| Debian | Debian Linux | 9.0 |
| Debian | Debian Linux | 10.0 |
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2013242Issue Tracking, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/03/msg00012.htmlMailing List, Third Party Advisory
- https://www.debian.org/security/2022/dsa-5096Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2013242Issue Tracking, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/03/msg00012.htmlMailing List, Third Party Advisory
- https://www.debian.org/security/2022/dsa-5096Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-20321?
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.
How severe is CVE-2021-20321?
CVE-2021-20321 has a CVSS score of 4.7/10 (MEDIUM severity). The EPSS model estimates a 0.21% probability of exploitation in the next 30 days.
How do I fix CVE-2021-20321?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-20321?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST