A linuxptp security update has been released for CentOS 7.

CESA-2021:2658 Important CentOS 7 linuxptp Security Update

CentOS Errata and Security Advisory 2021:2658 Important

Upstream details at :   https://access.redhat.com/errata/RHSA-2021:2658

The following updated files have been uploaded and are currently
syncing to the mirrors: ( sha256sum Filename )

x86_64:
5d92d36050c5d7174cd65358882ce23f7eab51af6a02070c42917f77f9dcb3fe linuxptp-2.0-2.el7_9.1.x86_64.rpm

Source:
a0aa8a92f7fc0f029559b186db4016eaab076fb34c67d1aaf9bb54143ca62a9a linuxptp-2.0-2.el7_9.1.src.rpm