A linuxptp security update has been released for Debian GNU/Linux 9 LTS to address a denial of service, information leak, or potentially remote code execution.

DLA 2723-1: linuxptp security update

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Debian LTS Advisory DLA-2723-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Thorsten Alteholz
July 31, 2021   https://wiki.debian.org/LTS
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Package : linuxptp
Version : 1.8-1+deb9u1
CVE ID : CVE-2021-3570

Miroslav Lichvar reported that the ptp4l program in linuxptp, an
implementation of the Precision Time Protocol (PTP), does not validate the
messageLength field of incoming messages, allowing a remote attacker to
cause a denial of service, information leak, or potentially remote code
execution.

For Debian 9 stretch, this problem has been fixed in version
1.8-1+deb9u1.

We recommend that you upgrade your linuxptp packages.

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

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