rds is also blocked by default in ubuntu, via the /etc/modprobe.d
/blacklist-rare-network.conf configuration file.

  # rds
  alias net-pf-21 off

It's also not entirely clear that this is actually remotely exploitable,
as network namespace exit is normally a local action, which is what
would trigger a cleanup. NVD's CVSS score
(https://nvd.nist.gov/vuln/detail/CVE-2019-11815) claims the
vulnerability is network accessible (which is the basis for a couple of
the news articles going around), but e.g. SUSE considers it local access
only (see https://www.suse.com/security/cve/CVE-2019-11815/).

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2019-11815

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

** Changed in: linux (Ubuntu)
   Importance: Undecided => Medium

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