Vulnerability CVE-2021-3996
Published: 2022-08-23

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 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. An attacker may use this flaw to cause a denial of service to applications that use the affected filesystems.

See advisories in our WLB2 database:
Topic
Author
Date
High
snap-confine must_mkdir_and_open_with_perms() Race Condition
Qualys Security ...
09.12.2022

Type:

CWE-362

 References:
https://github.com/util-linux/util-linux/commit/166e87368ae88bf31112a30e078cceae637f4cdb
https://access.redhat.com/security/cve/CVE-2021-3996
https://bugzilla.redhat.com/show_bug.cgi?id=2024628
https://mirrors.edge.kernel.org/pub/linux/utils/util-linux/v2.37/v2.37.3-ReleaseNotes
https://www.openwall.com/lists/oss-security/2022/01/24/2
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