CVE-2021-3996
5.5
MEDIUM
CVSS 3.1
EPSS 0.17%
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.
How to fix CVE-2021-3996
To remediate CVE-2021-3996, upgrade the affected package to a fixed version below.
- —upgrade to 2.37.3-r0 or later
- —upgrade to 2.36.1-8+deb11u1 or later
Is CVE-2021-3996 being exploited?
Low — EPSS is 0.2%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 2.37.3-r0
- from 0, < 2.36.1-8+deb11u1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |