A neutron security update has been released for Debian GNU/Linux 9 LTS to apply the fix for CVE-2021-40085.

DLA 3027-1: neutron security update

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Debian LTS Advisory DLA-3027-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Chris Lamb
May 26, 2022   https://wiki.debian.org/LTS
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Package : neutron
Version : 2:9.1.1-3+deb9u3
CVE ID : CVE-2021-40085
Debian Bug : #993398

It was discovered that the previous upload to neutron to Debian 9
"Stretch" (ie. version 2:9.1.1-3+deb9u2) was incomplete and did not
actually apply the fix for CVE-2021-40085.

For Debian 9 "Stretch", this has been resolved in version
2:9.1.1-3+deb9u3.

We recommend that you upgrade your neutron packages.

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

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