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ALPINE-CVE-2021-3995

ALPINE-CVE-2021-3995 PUBLISHED CVSS 5.5 MEDIUM

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.

Risk Scores

CVSS v3.1
5.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Products

VendorProductVersions
Alpine:v3.19util-linux2.16-r0, 2.23.1-r0, 2.22.2-r0
Alpine:v3.14util-linux2.16-r0, 2.14.2-r0, 2.16-r0
Alpine:v3.12util-linux2.35.1-r2, 2.35.2-r0, 2.35.1-r4
Alpine:v3.21util-linux2.16-r1, 2.16-r2, 2.16.2-r0
Alpine:v3.23util-linux2.23.2-r0, 0, 2.14.1-r0
Alpine:v3.17util-linux0, 2.14.1-r1, 2.14.1-r0
Alpine:v3.22util-linux2.37.2-r7, 0, 2.14.1-r0
Alpine:v3.20util-linux2.25.2-r2, 2.25.2-r1, 2.24.2-r4
Alpine:v3.15util-linux2.28-r0, 2.33-r0, 2.35.1-r1
Alpine:v3.18util-linux2.37.1-r0, 2.37.2-r0, 2.37.2-r2
Alpine:v3.13util-linux2.28-r3, 2.28-r2, 2.28-r1
Alpine:v3.16util-linux2.37-r4, 2.37.1-r0, 2.37.2-r0

Timeline

  • Aug 23, 2022 CVE Published
  • Dec 3, 2025 CVE Updated
  • Apr 30, 2026 Distribution Patch
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