QID 354315

Date Published: 2022-12-21

QID 354315: Amazon Linux Security Advisory for util-linux : ALAS2022-2022-086

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. (
( CVE-2021-3995) 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.
( CVE-2021-3996)



Note: The preceding description block is extracted directly from the security advisory. Using automation, we have attempted to clean and format it as much as possible without introducing additional issues.

Successful exploitation of this vulnerability could lead to a securitybreach or could affect integrity, availability, and confidentiality.

  • CVSS V3 rated as Medium - 5.5 severity.
  • CVSS V2 rated as Medium - 5.4 severity.
    • Solution
    Please refer to Amazon advisory: ALAS2022-2022-086 for affected packages and patching details, or update with your package manager.
    Vendor References

    CVEs related to QID 354315

    CVE-2021-3995 | CVE-2021-3996 |
    Software Advisories
    Advisory ID Software Component Link
    ALAS2022-2022-086 amazon linux 2022 URL Logo alas.aws.amazon.com/AL2022/ALAS-2022-086.html
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