If I install MSSQL 2008R2 SP3 will that cover all the security patched released before this patch ?

I also want to specifically know about this two Vulnerabilities in SQL Server Could Allow Elevation of Privilege

KB2977319, KB2977320

Please see more information about this in below blog: https://technet.microsoft.com/en-us/library/security/ms14-044.aspx

Regards, Srini