CVE-2021-47109 neighbour: allow NUD_NOARP entries to be forced GCed

In the Linux kernel, the following vulnerability has been resolved: neighbour: allow NUDNOARP entries to be forced GCed IFFPOINTOPOINT interfaces use NUDNOARP entries for IPv6. It's possible to fill up the neighbour table with enough entries that it will overflow for valid connections after that...

CVE-2021-47109

CVE-2021-47109: In the Linux kernel, IFF_POINTOPOINT interfaces use NUD_NOARP entries for IPv6. An attacker can force GC of NUD_NOARP entries by overflowing the neighbour table, leading to valid connections being dropped. The issue is tied to a change around neighbor garbage collection (commit 58...