Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

A KEY/DNSKEY record with PRIVATEDNS algorithm (253) and an
  overlong algorithm identifier can be stored, then crashes named
  when rendered to text. Requires UI:R (user interaction) — someone
  must first store the malformed record.