On January 17, Microsoft released Cumulative Update 15 (KB5008996) for SQL Server 2019 running on Linux and Windows.
The CU affects both the SQL Server Engine as well as the Analysis Services.
Below is the table with the new product versions after applying the latest CU:
You can read more on the release and the multiple fixes that it brings with it by visiting this link KB5008996 – Cumulative Update 15 for SQL Server 2019 and also getting the relevant download links.
You can read if CU or GDR is the choice for you by reading the post SQL Server patching: GDR vs CU.
As always, test before applying to production instances.