CVE-2021-3995

MEDIUM5.5EPSS 0.25%

util-linux - security update

Published: 8/23/2022Modified: 3/9/2026

Also known as:DSA-5055-1ALPINE-CVE-2021-3995DEBIAN-CVE-2021-3995DEBIAN-CVE-2021-3996

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 an unprivileged local attacker to unmount FUSE filesystems that belong to certain other users who have a UID that is a prefix of the UID of the attacker in its string form. An attacker may use this flaw to cause a denial of service to applications that use the affected filesystems.

Affected packages (3)

Alpine/util-linuxfrom 0, < 2.37.3-r0
Debian/util-linuxfrom 0, < 2.36.1-8+deb11u1
Debian/util-linuxfrom 0, < 2.36.1-8+deb11u1

CVSS scores

Source	Version	Severity	Vector
osv	CVSS 3.1	MEDIUM5.5	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References (2)

ADVISORYhttps://security.alpinelinux.org/vuln/CVE-2021-3995
ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2021-3995