A libpcap security update has been released for Debian GNU/Linux 9 LTS to address an improper PHB header length validation.

DLA 2850-1: libpcap security update

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Debian LTS Advisory DLA-2850-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Adrian Bunk
December 26, 2021   https://wiki.debian.org/LTS
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Package : libpcap
Version : 1.8.1-3+deb9u1
CVE ID : CVE-2019-15165
Debian Bug : 941697

Improper PHB header length validation was fixed in libpcap,
a library for capturing network traffic.

For Debian 9 stretch, this problem has been fixed in version
1.8.1-3+deb9u1.

We recommend that you upgrade your libpcap packages.

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

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