A util-linux security update has been released for Debian GNU/Linux 10 and 11 to address two vulnerabilities.

DSA 5055-1: util-linux security update

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Debian Security Advisory DSA-5055-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
January 24, 2022   https://www.debian.org/security/faq
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Package : util-linux
CVE ID : CVE-2021-3995 CVE-2021-3996

The Qualys Research Labs discovered two vulnerabilities in util-linux's
libmount. These flaws allow an unprivileged user to unmount other users'
filesystems that are either world-writable themselves or mounted in a
world-writable directory (CVE-2021-3996), or to unmount FUSE filesystems
that belong to certain other users (CVE-2021-3995).

For the stable distribution (bullseye), these problems have been fixed in
version 2.36.1-8+deb11u1.

We recommend that you upgrade your util-linux packages.

For the detailed security status of util-linux please refer to its
security tracker page at:
  https://security-tracker.debian.org/tracker/util-linux

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://www.debian.org/security/