VULNERABILITY INTELLIGENCE

CVE-2021-3996

CVSS score5.5 MEDIUM
EPSS probability0.64%
CISA KEVNot currently listed
Published2022-08-23
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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.

Weakness classification

  • secalert@redhat.com: CWE-552
  • nvd@nist.gov: CWE-552

Primary references