This indicates an attempt to exploit a denial-of-service vulnerability in the Linux kernel.
The vulnerability is caused by a memory-leak error when the Linux kernel handles a crafted IPv6 over IPv4 packet. An attacker exploiting this vulnerability can consume all available memory, thus creating a system-wide denial-of-service condition.
The Linux kernel before 18.104.22.168.
Denial of Service: Remote attackers can crash vulnerable systems.
Upgrade to the latest version (22.214.171.124).