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CVE-2021-3995

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Date: November 22, 2021

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.

Language: C

Severity Score

Related Resources (5)

https://security-tracker.debian.org/tracker/CVE-2021-3995
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-3995
https://github.com/util-linux/util-linux/commit/f3db9bd609494099f0c1b95231c5dfe383346929
https://nvd.nist.gov/vuln/detail/CVE-2021-3995
https://www.mend.io/vulnerability-database/CVE-2021-3995

Severity Score

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CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): HIGH
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

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