A qemu security update has been released for Debian GNU/Linux 9 LTS to address several issues.

DLA 2970-1: qemu security update

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Debian LTS Advisory DLA-2970-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Emilio Pozuelo Monfort
April 04, 2022   https://wiki.debian.org/LTS
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Package : qemu
Version : 1:2.8+dfsg-6+deb9u17
CVE ID : CVE-2021-3593 CVE-2021-3748 CVE-2021-3930 CVE-2021-20196
CVE-2022-26354

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

For Debian 9 stretch, these problems have been fixed in version
1:2.8+dfsg-6+deb9u17.

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 LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS