Update SQL Server release history for CU 21 and adjust related dates

Author: MikeRayMSFT

support/sql/database-engine/install/windows/error-rpc-server-unavailable-provisioning-account.md

@@ -237,5 +237,5 @@ To troubleshoot underlying Windows issues that cause SQL Server Setup to fail, s
 
 ## Related content
 
-- [SQL Server installation errors](/troubleshoot/sql/database-engine/install/windows/error-install-sql-server)
-- [Remove a partial installation of SQL Server](/troubleshoot/sql/database-engine/install/windows/remove-partial-installation)
+- [SQL Server installation errors](error-install-sql-server.md)
+- [Remove a partial installation of SQL Server](remove-partial-installation.md)

support/sql/releases/linux/release-history-2022.md

@@ -4,7 +4,7 @@ description: This article contains the release history for SQL Server 2022 runni
 author: rwestMSFT
 ms.author: randolphwest
 ms.reviewer: amitkh, vanto
-ms.date: 09/09/2025
+ms.date: 09/11/2025
 ms.update-cycle: 1095-days
 appliesto:
   - SQL Server 2022
@@ -23,6 +23,7 @@ The following table lists the release history for [!INCLUDE [sql-server-2022](..
 
 | Release | Version | Release date |
 | --- | --- | --- |
+| [CU 21](#CU21) | 16.0.4215.2 | 2025-09-11 |
 | [CU 20 GDR 2](#CU20-GDR2) | 16.0.4212.1 | 2025-09-09 |
 | [CU 20 GDR 1](#CU20-GDR1) | 16.0.4210.1 | 2025-08-12 |
 | [CU 20](#CU20) | 16.0.4205.1 | 2025-07-10 |
@@ -55,6 +56,24 @@ The following table lists the release history for [!INCLUDE [sql-server-2022](..
 | [GDR 1](#GDR1) | 16.0.1050.5 | 2023-02-14 |
 | [GA](#GA) | 16.0.1000.6 | 2022-11-16 |
 
+<a id="CU21"></a>
+
+## CU 21 (September 2025)
+
+This is the Cumulative Update 21 (CU 21) release of [!INCLUDE [sql-server-2022](../../includes/versions/sql-server-2022.md)]. The [!INCLUDE [sql-server-database-engine](../../includes/versions/sql-server-database-engine.md)] version for this release is 16.0.4215.2. For information about the fixes and improvements in this release, see the [Support article](/troubleshoot/sql/releases/sqlserver-2022/cumulativeupdate21).
+
+### Package details
+
+For manual or offline package installations, you can download the RPM and Debian packages with the information in the following table:
+
+| Distribution | Package version | Downloads |
+| --- | --- | --- |
+| **RHEL 9.x RPM packages**<br /><br />(Get RPM packages for [RHEL 8.x](https://packages.microsoft.com/rhel/8/mssql-server-2022/Packages/m/)) | 16.0.4215.2-2 | [Database Engine RPM package](https://packages.microsoft.com/rhel/9/mssql-server-2022/Packages/m/mssql-server-16.0.4215.2-2.x86_64.rpm)<br />[Extensibility RPM package](https://packages.microsoft.com/rhel/9/mssql-server-2022/Packages/m/mssql-server-extensibility-16.0.4215.2-2.x86_64.rpm)<br />[Full-Text Search RPM package](https://packages.microsoft.com/rhel/9/mssql-server-2022/Packages/m/mssql-server-fts-16.0.4215.2-2.x86_64.rpm)<br />[High Availability RPM package](https://packages.microsoft.com/rhel/9/mssql-server-2022/Packages/m/mssql-server-ha-16.0.4215.2-2.x86_64.rpm)<br />[PolyBase RPM package](https://packages.microsoft.com/rhel/9/mssql-server-2022/Packages/m/mssql-server-polybase-16.0.4215.2-2.x86_64.rpm) |
+| **SLES 15 RPM packages** | 16.0.4215.2-2 | [Database Engine RPM package](https://packages.microsoft.com/sles/15/mssql-server-2022/Packages/m/mssql-server-16.0.4215.2-2.x86_64.rpm)<br />[Extensibility RPM package](https://packages.microsoft.com/sles/15/mssql-server-2022/Packages/m/mssql-server-extensibility-16.0.4215.2-2.x86_64.rpm)<br />[Full-Text Search RPM package](https://packages.microsoft.com/sles/15/mssql-server-2022/Packages/m/mssql-server-fts-16.0.4215.2-2.x86_64.rpm)<br />[High Availability RPM package](https://packages.microsoft.com/sles/15/mssql-server-2022/Packages/m/mssql-server-ha-16.0.4215.2-2.x86_64.rpm)<br />[PolyBase RPM package](https://packages.microsoft.com/sles/15/mssql-server-2022/Packages/m/mssql-server-polybase-16.0.4215.2-2.x86_64.rpm) |
+| **Ubuntu 22.04 Debian packages**<br /><br />(Get Debian packages for [Ubuntu 20.04](https://packages.microsoft.com/ubuntu/20.04/mssql-server-2022/pool/main/m/mssql-server/)) | 16.0.4215.2-2 | [Database Engine Debian package](https://packages.microsoft.com/ubuntu/22.04/mssql-server-2022/pool/main/m/mssql-server/mssql-server_16.0.4215.2-2_amd64.deb)<br />[Extensibility Debian package](https://packages.microsoft.com/ubuntu/22.04/mssql-server-2022/pool/main/m/mssql-server-extensibility/mssql-server-extensibility_16.0.4215.2-2_amd64.deb)<br />[Full-Text Search Debian package](https://packages.microsoft.com/ubuntu/22.04/mssql-server-2022/pool/main/m/mssql-server-fts/mssql-server-fts_16.0.4215.2-2_amd64.deb)<br />[High Availability Debian package](https://packages.microsoft.com/ubuntu/22.04/mssql-server-2022/pool/main/m/mssql-server-ha/mssql-server-ha_16.0.4215.2-2_amd64.deb)<br />[PolyBase Debian package](https://packages.microsoft.com/ubuntu/22.04/mssql-server-2022/pool/main/m/mssql-server-polybase/mssql-server-polybase_16.0.4215.2-2_amd64.deb) |
+
+Go back to the [release history](#release-history).
+
 <a id="CU20-GDR2"></a>
 
 ## CU 20 GDR 2 (September 2025)