CVE-2022-31623

DISPUTED MariaDB Server before 10.7 is vulnerable to Denial of
Service. In extra/mariabackup/ds_compress.cc, when an error occurs (i.e.,
going to the err label) while executing the method create_worker_threads,
the held lock thd->ctrl_mutex 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.