CVE-2021-3732 Information disclosure in kernel

What is CVE-2021-3732?

CVE-2021-3732 is a medium-severity vulnerability in Linux kernel, published on 7 Mar 2022. It can only be exploited from the same machine or local network, with no action from the victim.

Official 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.

Weakness: CWE-200

Which versions are affected by CVE-2021-3732?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2021-3732?

Apply the vendor's patch.

Is CVE-2021-3732 being exploited?

There is no known exploitation of CVE-2021-3732 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2021-3732, GHSA-wc3f-5p43-3cxx, UBUNTU-CVE-2021-3732.