The fix in 4.6.16, 4.7.9, 4.8.4 and 4.9.7 for CVE-2018-10919 Confidential attribute disclosure vi LDAP filters was insufficient and an attacker may be able to obtain confidential BitLocker recovery keys from a Samba AD DC.
"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-26697.json"