CVE-2026-100081 xen-netback: defer xenvif_mcast_addr_list_free()

In the Linux kernel, the following vulnerability has been resolved: xen-netback: defer xenvifmcastaddrlistfree In order for the function to legitimately avoid locking/RCU, it needs to run after all TX/RX processing has finished/stopped: Lookups happen from xenvifstartxmit, while adds/removes happ...