This indicates an attack attempt to exploit a Buffer Overflow Vulnerability in Linux Kernel Netfilter iptables.
A remote, unauthenticated attacker could exploit this vulnerability by sending a specially crafted packet to the vulnerable service. Successful exploitation could cause a denial-of-service condition or arbitrary code execution in the security context of the iptables user.
Netfilter iptables 1.8.2
System Compromise: Remote attackers can crash vulnerable systems.
Apply the most recent upgrade or patch from the vendor.