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CVE-2021-3995

Public on 2022-05-31
Modified on 2024-02-12
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 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.

Severity
Medium
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CVSS v3 Base Score
4.7
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Affected Packages

Platform Package Release Date Advisory
Amazon Linux 2023 util-linux 2023-02-17 20:43 ALAS2023-2023-024

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 4.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD CVSSv3 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

Red Hat: CVE-2021-3995 Mitre: CVE-2021-3995 FAQs regarding Amazon Linux ALAS/CVE Severity