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.
References (9)
Core 9
Core References
Mailing List, Third Party Advisory mailing-list
http://www.openwall.com/lists/oss-security/2022/11/30/2
Mailing List, Third Party Advisory mailing-list
http://seclists.org/fulldisclosure/2022/Dec/4
Third Party Advisory, VDB Entry
http://packetstormsecurity.com/files/170176/snap-confine-must_mkdir_and_open_with_perms-Race-Condition.html
Broken Link, Issue Tracking
https://bugzilla.redhat.com/show_bug.cgi?id=2024631https://access.redhat.com/security/cve/CVE-2021-3995
Patch, Third Party Advisory
https://github.com/util-linux/util-linux/commit/57202f5713afa2af20ffbb6ab5331481d0396f8d
Release Notes, Vendor Advisory
https://mirrors.edge.kernel.org/pub/linux/utils/util-linux/v2.37/v2.37.3-ReleaseNotes
Third Party Advisory
https://security.netapp.com/advisory/ntap-20221209-0002/
Exploit, Mailing List, Patch, Third Party Advisory
https://www.openwall.com/lists/oss-security/2022/01/24/2
Third Party Advisory vendor-advisory
https://security.gentoo.org/glsa/202401-08
Scores
CVSS v3
5.5
EPSS
0.0025
EPSS Percentile
48.1%
Attack Vector
LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Details
CWE
CWE-552
Status
published
Products (2)
fedoraproject/fedora
35
kernel/util-linux
2.34 - 2.37.3
Published
Aug 23, 2022
Tracked Since
Feb 18, 2026