A hash collision flaw was found in the IPv6 connection lookup table in the Linux kernel’s IPv6 functionality when a user makes a new kind of SYN flood attack. A user located in the local network or with a high bandwidth connection can increase the CPU usage of the server that accepts IPV6 connections up to 95%.
https://www.debian.org/security/2023/dsa-5492
https://www.debian.org/security/2023/dsa-5480
https://security.netapp.com/advisory/ntap-20230929-0006/
https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html
https://lists.debian.org/debian-lts-announce/2023/10/msg00027.html