CVE-2021-3996

MediumCVSS 5.5/10Last modified Jun 17, 2026

Description

A logic error was found in the libmount library of util-linux in the function that allows an unprivileged user to unmount a FUSE filesystem. This flaw allows a local user on a vulnerable system to unmount other users' filesystems that are either world-writable themselves (like /tmp) or mounted in a world-writable directory. An attacker may use this flaw to cause a denial of service to applications that use the affected filesystems.

Metrics

CVSS 3.1 5.5/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-552

Affected software

No affected versions have been published.

Timeline

Published
Aug 23, 2022
Last modified
Jun 17, 2026
NVD status
Modified

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CVE-2021-3996: Medium severity, CVSS 5.5 | Vulnix