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KB5075211 - Cumulative Update 2 for SQL Server 2025

  • Applies to: SQL Server 2025 on Windows, SQL Server 2025 on Linux

Release Date:   February 12, 2026
Version:   17.0.4015.4

Summary

This article describes Cumulative Update (CU2) for Microsoft SQL Server 2025. This update package contains six fixes that were issued after the release of SQL Server 2025 Cumulative Update 1. It updates components in the following builds:

  • SQL Server - Product version: 17.0.4015.4, file version: 2025.170.4015.4
  • Analysis Services - Product version: 17.0.25.223, file version: 2025.170.25.223

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 2025, SQL Server 2022, SQL Server 2019, and SQL Server 2017. Download this Excel file now.

Note

Individual entries in the following table can be referenced directly through a bookmark. If you select any bug reference ID in the table, a bookmark tag is added to the URL by using the "#NNNNNNN" format. You can then share this URL with others so that they can jump directly to the desired fix in the table.

For more information about the bugs that are fixed and enhancements that are included in this cumulative update, see the following table.

Bug reference Description Fix area Component Platform
4838699 Fixes an issue that causes StripedVdi tests to fail if the Sqlvdi.dll file isn't registered on running instances. SQL Server Engine Backup Restore Windows
4860948 For cluster_type = NONE or EXTERNAL, availability group (AG) properties exist on only the local replica. This update writes the properties to the AG configuration so that all AG replicas receive the same properties. SQL Server Engine High Availability and Disaster Recovery All
4869015 Fixes a potential inaccuracy in resource governor accounting for the tempdb space if accelerated database recovery is enabled for tempdb. SQL Server Engine Resource Governor All
4924793 Fixes an issue in which an assertion and a dump file are generated around midnight on New Year’s Day during an operation that accesses Azure Blob Storage. SQL Server Engine Storage Management All
4925942 Fixes an issue that triggers nonyielding scheduler dump files in PmmLogAcceptBlock on the availability group (AG) secondary replica. The issue occurs if the persistent log buffer is enabled, and the database log cache contains primarily tiny log records. SQL Server Engine Log Management All
4931611 Fixes an issue in which the distributor is part of an availability group (AG) and uses case-sensitive (_CS) collation. The distribution agent incorrectly uses the AG primary replica name instead of AG listener name. SQL Server Engine Replication All

How to obtain or download this CU or the latest CU package

File information

Notes for this update

How to uninstall this update

References

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