Which Samba versions will get patches?
Patches will be available for Samba 4.4, Samba 4.3 and Samba 4.2 on April 12th.
With the release of Samba 4.4.0 on March 22nd the 4.1 release branch has been marked DISCONTINUED.
Please be aware that Samba 4.1 and below are out of support, even for security fixes. We strongly advise users to upgrade to a supported release, so that you will not have to make a major version update at the time you need to get the security fix installed.
Unless the patch can be backported to 3.6 it appears that the current OpenWrt package should get an upgrade.
