A pacemaker regression update has been released for Debian GNU/Linux 9 LTS to address a regression introduced by the previous update.

DLA 2447-2: pacemaker regression update

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Debian LTS Advisory DLA-2447-2 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Markus Koschany
November 17, 2020   https://wiki.debian.org/LTS
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Package : pacemaker
Version : 1.1.16-1+deb9u2
Debian Bug : 974563

The update of pacemaker released as DLA-2447-1 caused a regression when the
communication between the Corosync cluster engine and pacemaker takes place. A
permission problem prevents IPC requests between cluster nodes. The patch for
CVE-2020-25654 has been reverted until a better solution can be found.

For Debian 9 stretch, this problem has been fixed in version
1.1.16-1+deb9u2.

We recommend that you upgrade your pacemaker packages.

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

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