KB5074819: Fixes an AV assertion issue in DbMgrPartner

KB5074819 - Cumulative Update 23 for SQL Server 2022
Applies to: SQL Server 2022 on Windows, SQL Server 2022 on Linux
Release Date: January 15, 2026
Version: 16.0.4235.2

Summary
This article describes Cumulative Update package 23 (CU23) for Microsoft SQL Server 2022. This update contains 15 fixes that were issued after the release of SQL Server 2022 Cumulative Update 22. It updates components in the following builds:

SQL Server - Product version: 16.0.4235.2, file version: 2022.160.4235.2
Analysis Services - Product version: 16.0.43.252, file version: 2022.160.43.252
Known issues in this update

Incorrect behavior of SESSION_CONTEXT in parallel plans
Queries that use the built-in SESSION_CONTEXT function might return incorrect results or trigger access violation (AV) dump files when run in parallel query plans. This issue occurs because of the manner in which SESSION_CONTEXT interacts with parallel execution threads, particularly if the session is reset for reuse.

For more information, see the Known issues section in SESSION_CONTEXT.

Improvements and fixes included in this update
A downloadable Microsoft Excel workbook that contains a summary list of builds, together with their current support lifecycle, is available. The Excel file also contains detailed fix lists for SQL Server 2022, SQL Server 2019, and SQL Server 2017. Download this Excel file now.

SQL Server Resolved Issues
Bug reference: 4676249
Description: Fixes an issue in which backup log operations fail and return an error that indicates that BACKUP LOG is not allowed while the recovery model is SIMPLE.
Fix Area: SQL Server Engine
Component: Backup Restore
Platform: Windows

Bug reference: 4710575
Description: Fixes an AV assertion issue in DbMgrPartner that's related to new log readiness notifications.
Fix Area: SQL Server Engine
Component: High Availability and Disaster Recovery
Platform: All

Bug reference: 4769216
Description: Fixes an issue in which non-yielding scheduler dump files are generated when SSL connections are closed under high CPU load.
Fix Area: Conectivity
Component: Protocols
Platform: All

Bug reference: 4783675
Description: Fixes an issue in which upgrading from SQL Server 2019 to SQL Server 2022 might cause the upgrade process to stop responding during the model database upgrade phase.
Fix Area: SQL Server Engine
Component: Programmability
Platform: All

Bug reference: 4783748
Description: Changes the behavior of the program to return error 19544 instead of returning an assert when you create an availability group that has a name that's longer than 64 characters by using cluster_type = NONE or EXTERNAL.
Fix Area: SQL Server Engine
Component: High Availability and Disaster Recovery
Platform: All

Bug reference: 4796333
Description: Fixes an issue that causes crashes when an invalid ID type is returned from the Domain Controller in LookupAccountSid.
Fix Area: SQL Server Engine
Component: Linux
Platform: Linux

Bug reference: 4796376
Description: Fixes an issue that prevents Active Directory logins from working if the keytab file is updated too long after the privileged user password is rotated.
Fix Area: SQL Server Engine
Component: Linux
Platform: Linux

Bug reference: 4798276
Description: Fixes an issue in which Distributed Availability Group seeding fails if the local Availability Group is offline.
Fix Area: SQL Server Engine
Component: High Availability and Disaster Recovery
Platform: Windows

Bug reference: 4807292
Description: Fixes a failure to configure multiple concurrent auditing to write to the Security Event log during updates.
Fix Area: SQL Server Engine
Component: Security Infrastructure
Platform: All

Bug reference: 4811256
Description: Fixes a crash that's caused by a missing partition in a common table expression (CTE).
Fix Area: SQL Server Engine
Component: Programmability
Platform: All

Bug reference: 4818763
Description: Fixes a bug that causes memory allocation failure during VDI restore operations if memory is limited through cgroupsv2 on Linux.
Fix Area: SQL Server Engine
Component: Linux
Platform: Linux

Bug reference: 4837925
Description: Fixes an issue in which SSCM fails when it imports certain certificates, including self-signed certificates that are password protected and certificates exported from Azure AKV that are not password protected.
Fix Area: SQL Server Configuration Manager
Component: Certificate Import
Platform: Windows

Bug reference: 4838959
Description: Restricts privileges for dbcc stackdump so that only the sysadmin can invoke the dump file.
Fix Area: SQL Server Engine
Component: Security Infrastructure
Platform: All

Bug reference: 4849635
Description: Fixes an issue in which AppDomains in a DOOMED state are not unloaded correctly.
Fix Area: SQL Server Engine
Component: Query Execution
Platform: All

Bug reference: 4866387
Description: Allows using the sys.fn_xe_file_target_read_file() function to read system_health event session data in Azure SQL Managed Instance.
Fix Area: SQL Server Engine
Component: SQL OS
Platform: Windows