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CVE-2021-3995

Published: 1 February 2022

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.

Notes

AuthorNote
sbeattie
introduced in 5fea669e9ef0a08804f72bb40f859f239f68c30a (v2.34)
Priority

Medium

CVSS 3 base score: 5.5

Status

Package Release Status
util-linux
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(code not present)
focal
Released (2.34-0.1ubuntu9.3)
impish
Released (2.36.1-8ubuntu2.2)
jammy
Released (2.37.2-4ubuntu2)
trusty Not vulnerable
(code not present)
upstream
Released (2.37.3-1)
xenial Not vulnerable
(code not present)
Patches:
upstream: https://github.com/util-linux/util-linux/commit/9c05f4b6bf62a20a64a8e5735c7f3dcf0229e895
upstream: https://github.com/util-linux/util-linux/commit/57202f5713afa2af20ffbb6ab5331481d0396f8d