A bluez security update has been released for Debian GNU/Linux 9 LTS to address a double-free vulnerability in blue.

DLA 2410-1: bluez security update

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Debian LTS Advisory DLA-2410-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Chris Lamb
October 21, 2020   https://wiki.debian.org/LTS
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Package : bluez
Version : 5.43-2+deb9u3
CVE ID : CVE-2020-27153

It was discovered that there was a double-free vulnerability in
bluez, a suite of Bluetooth tools, utilities and daemons.

For Debian 9 "Stretch", this problem has been fixed in version
5.43-2+deb9u3.

We recommend that you upgrade your bluez packages.

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

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