A set of carefully crafted ipv6 packets can trigger an integer overflow in the calculation of a fragment reassembled packet's payload length field. This allows an attacker to trigger a kernel panic, resulting in a denial of service.
https://security.netapp.com/advisory/ntap-20230804-0001/
https://security.FreeBSD.org/advisories/FreeBSD-SA-23:06.ipv6.asc