CVE-2021-3732
MEDIUMCVSS 5.5/10EPSS 0.33%
Last modified
CVE-2021-3732 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. A flaw was found in the Linux kernel's OverlayFS subsystem in the way the user mounts the TmpFS filesystem with OverlayFS. This flaw allows a local user to gain access to hidden files that should not be accessible.. EPSS estimates a 0.33% chance of exploitation in the next 30 days.
Description
A flaw was found in the Linux kernel's OverlayFS subsystem in the way the user mounts the TmpFS filesystem with OverlayFS. This flaw allows a local user to gain access to hidden files that should not be accessible.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | < 5.14 |
| Linux | Linux Kernel | 5.14 |
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1995249Issue Tracking, Patch, Third Party Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=427215d85e8d1476da1a86b8d67aceb485eb3631Mailing List, Patch, Vendor Advisory
- https://github.com/torvalds/linux/commit/427215d85e8d1476da1a86b8d67aceb485eb3631Patch, Third Party Advisory
- https://ubuntu.com/security/CVE-2021-3732Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1995249Issue Tracking, Patch, Third Party Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=427215d85e8d1476da1a86b8d67aceb485eb3631Mailing List, Patch, Vendor Advisory
- https://github.com/torvalds/linux/commit/427215d85e8d1476da1a86b8d67aceb485eb3631Patch, Third Party Advisory
- https://ubuntu.com/security/CVE-2021-3732Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-3732?
A flaw was found in the Linux kernel's OverlayFS subsystem in the way the user mounts the TmpFS filesystem with OverlayFS. This flaw allows a local user to gain access to hidden files that should not be accessible.
How severe is CVE-2021-3732?
CVE-2021-3732 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.33% probability of exploitation in the next 30 days.
How do I fix CVE-2021-3732?
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-2021-3732?
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Scan your code nowSource: NVD / NIST