A qemu security update has been released for Debian GNU/Linux 11 to address multiple security issues.

DSA 4980-1: qemu security update

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Debian Security Advisory DSA-4980-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
October 03, 2021   https://www.debian.org/security/faq
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Package : qemu
CVE ID : CVE-2021-3544 CVE-2021-3545 CVE-2021-3546 CVE-2021-3638
CVE-2021-3682 CVE-2021-3713 CVE-2021-3748
Debian Bug : 988174 989042 991911 992726 992727 993401

Multiple security issues were discovered in QEMU, a fast processor
emulator, which could result in denial of service or the the execution
of arbitrary code.

For the stable distribution (bullseye), these problems have been fixed in
version 1:5.2+dfsg-11+deb11u1.

We recommend that you upgrade your qemu packages.

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

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/