Microsoft Dynamics AX 2012 R3 Cumulative Update 10 and AX 2012 R2 Cumulative Update 9 are now compatible with SQL Server 2012 SP3.

The Microsoft Dynamics AX 2012 System Requirements have been updated to reflect this change.

Microsoft Dynamics AX 2012 R3 Cumulative Update 10 and AX 2012 R2 Cumulative Update 9 are now compatible with SQL Server 2012 SP3.

The Microsoft Dynamics AX 2012 System Requirements have been updated to reflect this change.

Is AX 2012 R2 CU9 kernel enough or are application updates needed as well?

Thanks in advance

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No, just patching the KERNEL is not enough. You need to run the APPLICATION at the build specified.