Rpcbind: unbounded memory allocation in rpcbind statistics tracking allows unauthenticated remote denial of service

Restrict network access to the rpcbind service on port 111 to trusted systems. This can be achieved by configuring firewall rules to limit inbound connections. For example, using firewalld on Red Hat Enterprise Linux:

# To allow access only from a specific trusted network (e.g., 192.168.1.0/24)
firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="192.168.1.0/24" port port="111" protocol="tcp" accept'
firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="192.168.1.0/24" port port="111" protocol="udp" accept'
firewall-cmd --reload

If rpcbind is only required for local services, ensure it is configured to listen only on the loopback interface or is otherwise protected from external network exposure. Applying these firewall rules will take effect immediately upon firewall-cmd --reload and may temporarily interrupt existing connections to rpcbind.