An openvswitch security update has been released for Debian GNU/Linux 11 to address a denial of service issue.

DSA 5387-1: openvswitch security update

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Debian Security Advisory DSA-5387-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
April 13, 2023   https://www.debian.org/security/faq
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Package : openvswitch
CVE ID : CVE-2023-1668
Debian Bug : 1034042

David Marchard discovered that Open vSwitch, a software-based Ethernet
virtual switch, is suspectible to denial of service via malformed IP
packets.

For the stable distribution (bullseye), this problem has been fixed in
version 2.15.0+ds1-2+deb11u4.

We recommend that you upgrade your openvswitch packages.

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

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/