It is a world wide request, there where already several attacks on major big DNS systems. If the attack is successfull then your DNS server does not serve any requests anymore so all your hosted domains will be un reachable.
CentOS 4: yum update bind
CentOS 6: The new bind package is in the CR repo
BIND 9 Resolver crashes after logging an error in query.c
Dla tych, którzy używają binda: