A kexec-tools bugfix update has been released for CentOS 7.

CentOS-announce: CEBA-2020:5034 CentOS 7 kexec-tools BugFix Update

CentOS Errata and Bugfix Advisory 2020:5034

Upstream details at :   https://access.redhat.com/errata/RHBA-2020:5034

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

x86_64:
44c119ffc1f4001f24a6905dc7a8b1db1b192babbc6e3390b81e54adfb63b7b8 kexec-tools-2.0.15-51.el7_9.1.x86_64.rpm
b46ce984b02b31bec731f80328c745600ec4e07a5c031e77dbb554e88ba7fcbb kexec-tools-anaconda-addon-2.0.15-51.el7_9.1.x86_64.rpm
f08e9ea6985102fff682040f9282a64d08ae60b52a53ac25a2ae2d14b381049e kexec-tools-eppic-2.0.15-51.el7_9.1.x86_64.rpm

Source:
1f08a01aa02e37758563d7345dbfd29ff0fbffabf507723a881e2cdb750e8b8e kexec-tools-2.0.15-51.el7_9.1.src.rpm