CVE-2022-31621

DISPUTED MariaDB Server before 10.7 is vulnerable to Denial of
Service. In extra/mariabackup/ds_xbstream.cc, when an error occurs
(stream_ctxt->dest_file == NULL) while executing the method xbstream_open,
the held lock is not released correctly, which allows local users to
trigger a denial of service due to the deadlock. Note: The vendor argues
this is just an improper locking bug and not a vulnerability with adverse
effects.