CVE-2021-3732

Name: CVE-2021-3732
Creator: NVD / NIST
Published: 2022-03-10T17:42:59.287+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.33%

Last modified Jun 17, 2026

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

5.5/10

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

EPSS Probability

0.33%

24.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-200

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: Mar 10, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3732?

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.

Are you affected by CVE-2021-3732?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST