Fedora has released security update for libldb and samba to fix the vulnerability.
On successful exploitation Missing null pointer checks may crash the external print server process and AD DC any authenticated user can change other users’ passwords over LDAP, including the passwords of administrative users and service accounts.
Fedora has issued updated packages to fix this vulnerability.
For more information about the vulnerability and obtaining patches, refer to the following Fedora security advisories :
Fedora 27 Update
Following are links for downloading patches to fix the vulnerabilities: