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CVE-2021-3995 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:5.5 MEDIUMVector:CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.

URL	Source(s)	Tag(s)
http://packetstormsecurity.com/files/170176/snap-confine-must_mkdir_and_open_with_perms-Race-Condition.html	CVE	Third Party AdvisoryVDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=2024631https://access.redhat.com/security/cve/CVE-2021-3995	CVE	Broken LinkIssue Tracking
http://seclists.org/fulldisclosure/2022/Dec/4	CVE	Mailing ListThird Party Advisory
https://github.com/util-linux/util-linux/commit/57202f5713afa2af20ffbb6ab5331481d0396f8d	CVE	PatchThird Party Advisory
https://mirrors.edge.kernel.org/pub/linux/utils/util-linux/v2.37/v2.37.3-ReleaseNotes	CVE	Release NotesVendor Advisory
https://security.gentoo.org/glsa/202401-08	CVE
https://security.netapp.com/advisory/ntap-20221209-0002/	CVE	Third Party Advisory
https://www.openwall.com/lists/oss-security/2022/01/24/2	CVE	ExploitMailing ListPatchThird Party Advisory
http://www.openwall.com/lists/oss-security/2022/11/30/2	CVE	Mailing ListThird Party Advisory
http://packetstormsecurity.com/files/170176/snap-confine-must_mkdir_and_open_with_perms-Race-Condition.html	[email protected]	Third Party AdvisoryVDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=2024631https://access.redhat.com/security/cve/CVE-2021-3995	[email protected]	Broken LinkIssue Tracking
http://seclists.org/fulldisclosure/2022/Dec/4	[email protected]	Mailing ListThird Party Advisory
https://github.com/util-linux/util-linux/commit/57202f5713afa2af20ffbb6ab5331481d0396f8d	[email protected]	PatchThird Party Advisory
https://mirrors.edge.kernel.org/pub/linux/utils/util-linux/v2.37/v2.37.3-ReleaseNotes	[email protected]	Release NotesVendor Advisory
https://security.gentoo.org/glsa/202401-08	[email protected]
https://security.netapp.com/advisory/ntap-20221209-0002/	[email protected]	Third Party Advisory
https://www.openwall.com/lists/oss-security/2022/01/24/2	[email protected]	ExploitMailing ListPatchThird Party Advisory
http://www.openwall.com/lists/oss-security/2022/11/30/2	[email protected]	Mailing ListThird Party Advisory

see all 18 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-552	Files or Directories Accessible to External Parties	[email protected]
CWE-552	Files or Directories Accessible to External Parties	[email protected]

Affected Products

Product	Versions
kernel util-linux	>= 2.34, < 2.37.3
CPE cpe:2.3:a:kernel:util-linux:::::::: Remediation No remediation found in references.
fedoraproject fedora	35
CPE cpe:2.3:o:fedoraproject:fedora:35:::::::* Remediation No remediation found in references.

Change History

12 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Nov 21, 2024	CVE Modified	CVE
May 14, 2024	CVE Modified	[email protected]
Jan 7, 2024	CVE Modified	[email protected]
Feb 3, 2023	Modified Analysis	[email protected]
Dec 9, 2022	CVE Modified	[email protected]
Dec 9, 2022	CVE Modified	[email protected]
Dec 9, 2022	CVE Modified	[email protected]
Dec 7, 2022	Modified Analysis	[email protected]
Dec 1, 2022	CVE Modified	[email protected]
Oct 24, 2022	Reanalysis	[email protected]
Aug 29, 2022	Initial Analysis	[email protected]