With every release of SQL Server product or subsequent service packs or Cumulative updates, new bugs are encountered or discovered. Below are some of the bugs which were fixed with the release of SQL Server 2012 Service Pack 1 (SP 1) for Microsoft SQL Server 2012.
SQL Server MSDN Bug Number 861377
You cannot use the SQL Server slipstream package to update the current feature to Service Pack 1 when you add a new feature at the same time.
SQL Server MSDN Bug Number 846622
The Install wizard freezes when it searches for product updates.
SQL Server MSDN Bug Number 817937
FIX: Master Data Services (MDS) feature is visible in the feature tree when you try to uninstall SQL Server 2012 SP1.
SQL Server MSDN Bug Number 954667
FIX: When you try to update the SQL Server Client Tools or SQL Server Full-Text Search feature by using a corrupted installer file, the feature does not display the correct error message.
SQL Server MSDN Bug Number 819093
Feature selection is unavailable when you install a security update for shared components when the instance component is at a different service pack level.
SQL Server MSDN Bug Number 907647
FIX: Updates SQM to report the service pack level as a number.
SQL Server MSDN Bug Number 887062
FIX: SQL Server service pack applies English to certain features even though these features are installed by using a localized language.
SQL Server MSDN Bug Number 1018645
“Exit code:-2068578302” error message when you try to uninstall an instance of SQL Server 2012.
SQL Server MSDN Bug Number 829208
Reporting service is in a bad state after a SQL Server upgrade fails.
Hope this was helpful.
This is applicable for below versions of SQL Server
SQL Server 2014
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