PT-2022-1459 · Unknown+5 · Util-Linux+5

Published 2022-01-24 · Updated 2025-10-27 · CVE-2021-3995

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions util-linux (affected versions not specified)

Description The issue is related to incorrect permissions and access privileges in the util-linux package. A logic error was found in the libmount library, specifically in the function that allows an unprivileged user to unmount a FUSE filesystem. This flaw enables an unprivileged local attacker to unmount FUSE filesystems belonging to certain other users who have a UID that is a prefix of the attacker's UID in its string form, potentially causing a denial of service to applications using the affected filesystems.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

DoS

Files Accessible to External Parties

Weakness Enumeration

CWE-264

CWE-552

Related Identifiers

ALT-PU-2022-1123

ALT-PU-2022-3036

BDU:2022-00588

CVE-2021-3995

DSA-5055-1

JLSEC-2025-192

MGASA-2022-0076

OESA-2022-1536

OPENSUSE-SU-2022:0727-1

OPENSUSE-SU-2022_0727-1

OPENSUSE-SU-2024:11784-1

SUSE-SU-2022:0727-1

SUSE-SU-2022:0727-2

SUSE-SU-2022_0727-1

USN-5279-1

Affected Products

Alt Linux

Linuxmint

Red Os

Suse

Ubuntu

Util-Linux

References · 56

• 🔥 https://openwall.com/lists/oss-security/2022/01/24/2 · Exploit
• https://github.com/util-linux/util-linux/commit/57202f5713afa2af20ffbb6ab5331481d0396f8d · Patch
• https://osv.dev/vulnerability/openSUSE-SU-2024:11784-1 · Vendor Advisory
• https://osv.dev/vulnerability/DSA-5055-1 · Vendor Advisory
• https://security.gentoo.org/glsa/202401-08 · Vendor Advisory
• https://osv.dev/vulnerability/MGASA-2022-0076 · Vendor Advisory
• https://advisories.mageia.org/MGASA-2022-0076.html · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-3995 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-5279-1 · Vendor Advisory
• https://osv.dev/vulnerability/JLSEC-2025-192 · Vendor Advisory
• https://debian.org/security/2022/dsa-5055 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-3995 · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2022:0727-2 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-3996 · Security Note
• https://lists.fedoraproject.org/archives/list/[e-mail]/thread/SW73IARDAP7WWQ6ETYQB2OS2SLW4XTT3 · Vendor Advisory