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 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.

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