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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2021-3996 Detail

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

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
http://packetstormsecurity.com/files/170176/snap-confine-must_mkdir_and_open_with_perms-Race-Condition.html CVE, Inc., Red Hat Third Party Advisory 
http://seclists.org/fulldisclosure/2022/Dec/4 CVE, Inc., Red Hat Mailing List  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2022/11/30/2 CVE, Inc., Red Hat Mailing List  Third Party Advisory 
https://access.redhat.com/security/cve/CVE-2021-3996 CVE, Inc., Red Hat Issue Tracking  Third Party Advisory 
https://bugzilla.redhat.com/show_bug.cgi?id=2024628 CVE, Inc., Red Hat Issue Tracking  Patch  Third Party Advisory 
https://github.com/util-linux/util-linux/commit/166e87368ae88bf31112a30e078cceae637f4cdb CVE, Inc., Red Hat Patch  Third Party Advisory 
https://mirrors.edge.kernel.org/pub/linux/utils/util-linux/v2.37/v2.37.3-ReleaseNotes CVE, Inc., Red Hat Release Notes  Vendor Advisory 
https://security.gentoo.org/glsa/202401-08 CVE, Inc., Red Hat
https://security.netapp.com/advisory/ntap-20221209-0002/ CVE, Inc., Red Hat Broken Link  Third Party Advisory 
https://www.openwall.com/lists/oss-security/2022/01/24/2 CVE, Inc., Red Hat Exploit  Mailing List  Patch  Third Party Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-552 Files or Directories Accessible to External Parties cwe source acceptance level NIST   Red Hat, Inc.  

Known Affected Software Configurations Switch to CPE 2.2

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Change History

11 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2021-3996
NVD Published Date:
08/23/2022
NVD Last Modified:
11/21/2024
Source:
Red Hat, Inc.