kernel: netfilter: bridge: confirm multicast packets before passing them up the stack

A security vulnerability was identified in the Linux kernel's netfilter subsystem, specifically affecting the handling of multicast and broadcast packets on network bridges. The issue arises from a race condition in the connection tracking conntrack module when processing cloned socket buffers sk...

CVE-2024-27415

CVE-2024-27415 : Linux kernel netfilter bridge multicast handling races between macvlan clones and conntrack nf_confirm, risking unconfirmed nf_conn entries for multicast/broadcast frames. The race occurs when a L2 multicast/broadcast packet is cloned and sent across bridge interfaces, with confi...