Kernel

Edit /etc/security/limits.conf and append the following lines:

 * hard core 0
 * soft core 0

Edit /etc/sysctl.d/9999-disable-core-dump.conf:

fs.suid_dumpable=0
kernel.core_pattern=|/bin/false

sudo sysctl -p /etc/sysctl.d/9999-disable-core-dump.conf

/bin/false exits with a failure status code. The default value for kernel.core_pattern is core on a Debian server and |/usr/lib/systemd/systemd-coredump %P %u %g %s %t %c %h on a Fedora desktop. These commands are executed upon crashes. In the case of /bin/false, nothing happens, and core dump is disabled.
fs.suid_dumpable=0 Any process that has changed privilege levels or is execute only will not be dumped. Other values include 1, which is debug mode, and all processes dump core when possible. The current user owns the core dump, no security is applied. 2, suidsafe mode, in which any Linux program that would generally not be dumped is dumped regardless, but only if the kernel.core_pattern in sysctl is set to a valid program.

sudo mkdir /etc/systemd/coredump.conf.d/
sudo nvim /etc/systemd/coredump.conf.d/custom.conf

[Coredump]
Storage=none
ProcessSizeMax=0

Storage=none and ProcessSizeMax=0 disables all coredump handling except for a log entry under systemd.

sudo systemctl daemon-reload

Edit /etc/systemd/system.conf. Make sure DefaultLimitCORE is commented out.

#DefaultLimitCORE=infinity

sudo systemctl daemon-reexec