Public bug reported:

Bind9 released version 9.18.1 recently, and we should have it in Jammy.

This new release is already availble in Debian unstable, and contains a
sizeable list of bugfixes.  It is the first point release after bind9
9.18.0, and the project has a track record of fixing important bugs in
the .1 release.

You can see the release notes for 9.18.1 here:
https://bind9.readthedocs.io/en/v9_18_1/notes.html

For more detailed notes: https://gitlab.isc.org/isc-
projects/bind9/-/blob/1a4e4c2989ede3f993fc352b6c77929f8c286887/CHANGES

There are 3 items described as Feature Changes:

  * The DLZ API has been updated: EDNS Client-Subnet (ECS) options sent
by a client are now included in the client information sent to DLZ
modules when processing queries. [GL #3082]

  * DEBUG(1)-level messages were added when starting and ending the BIND
9 task-exclusive mode that stops normal DNS operation (e.g. for
reconfiguration, interface scans, and other events that require
exclusive access to a shared resource). [GL #3137]

  * The limit on the number of simultaneously processed pipelined DNS
queries received over TCP has been removed. Previously, it was capped at
23 queries processed at the same time. [GL #3141]


The last 2 changes seem trivial; the first one seems to aim at a specific 
scenario and I find it unlikely that it will affect most users.

** Affects: bind9 (Ubuntu)
     Importance: High
     Assignee: Sergio Durigan Junior (sergiodj)
         Status: Confirmed

** Affects: bind9 (Ubuntu Jammy)
     Importance: High
     Assignee: Sergio Durigan Junior (sergiodj)
         Status: Confirmed


** Tags: server-todo

** Also affects: bind9 (Ubuntu Jammy)
   Importance: High
     Assignee: Sergio Durigan Junior (sergiodj)
       Status: Confirmed

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https://bugs.launchpad.net/bugs/1965981

Title:
  [FFe] Update bind9 to 9.18.1

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