This looks like a possible use-after-free so likely has a security
impact (at a minimum it is a denial of service due to the crash,
especially if it can be triggered remotely) - I've reported it to ISC as
such who will hopefully assign a CVE and then we can fix it as a
security update. For future reference, the RT #48804 contains a patch
that should likely be fine for Bionic
https://bugs.isc.org/Public/Ticket/Attachment/534989/331007/46719.v4_3.diff

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https://bugs.launchpad.net/bugs/1781699

Title:
  DHCPv6 server crashes regularly (bionic)

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