CVE-2021-47109

In the Linux kernel, the following vulnerability has been resolved:
neighbour: allow NUD_NOARP entries to be forced GCed IFF_POINTOPOINT
interfaces use NUD_NOARP entries for IPv6. It’s possible to fill up the
neighbour table with enough entries that it will overflow for valid
connections after that. This behaviour is more prevalent after commit
58956317c8de (“neighbor: Improve garbage collection”) is applied, as it
prevents removal from entries that are not NUD_FAILED, unless they are more
than 5s old.