The problem can be corrected by updating your system to the following package versions: Ubuntu 18.04 LTS: samba 2:4.7.6+dfsg~ubuntu-0ubuntu2.26 In general, a standard system update will make all the necessary changes.
https://ubuntu.com/security/notices/USN-5174-1
CVE-2016-2124, CVE-2020-25717, CVE-2020-25722, CVE-2021-3671
https://launchpad.net/ubuntu/+source/samba/2:4.7.6+dfsg~ubuntu-0ubuntu2.26
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