KB5122768 - Description of the security update for SQL Server 2022 CU26: September 8, 2026

Applies To
SQL Server 2022 on Windows (all editions) SQL Server 2022 on Linux (all editions)

Release date: September 8, 2026

Version: 16.0.4275.2

Summary

This security update contains fixes and resolves vulnerabilities. To learn more about the vulnerabilities, see the following security advisories:

The Microsoft SQL Server components are updated to the following builds in this security update:

  • SQL Server - product version: 16.0.4275.2, file version: 2022.160.4275.2

Important

To help secure SQL Server on Windows, enable encryption with Extended Protection.

Known issues in this update

Linked server queries that use MSDASQL fail with error 7416

Linked server queries that use the MSDASQL (OLE DB Provider for ODBC Drivers) provider and specify a provider string (@provstr) fail and return the following error message:

Msg 7416, Level 16
Access to the remote server is denied because no login-mapping exists.

A stricter connection validation check in the Database Engine can reject connections for certain linked server configurations that use the MSDASQL provider, even if earlier builds allowed those connections.

For more information and workarounds, see Linked server queries that use MSDASQL fail with error 7416.

Access violation when you query sys.dm_exec_requests during database recovery

Queries against sys.dm_exec_requests might raise an access violation and generate a dump file if they run while a database is still recovering. This issue can occur during a database RESTORE operation, during startup recovery, or before an availability group replica finishes coming online.

The SQL Server error log contains entries that resemble the following text:

The database '<DatabaseName>' is marked RESTORING and is in a state that does not allow recovery to be run.
***Stack Dump being sent to <SQLServerLogFolder>\SQLDump0215.txt
SqlDumpExceptionHandler: Process 77 generated fatal exception c0000005 EXCEPTION_ACCESS_VIOLATION. SQL Server is terminating this process.
*******************************************************************************

BEGIN STACK DUMP:
  07/30/26 07:37:23 spid 77

Exception Address = <frame id="00" address="0x7FFDED94970D" pdb="sqlmin.pdb" age="2" guid="E1039014-237E-4DB6-88FD-4A2AB31C651F" module="sqlmin" rva="0x2970D" />
Exception Code    = c0000005 EXCEPTION_ACCESS_VIOLATION
Access Violation occurred reading address 00000000000000F0
Input Buffer <size> bytes -
          <dbo.sp_YourMonitoringStoredProcedure>

This issue occurs because of a change that causes internal in-memory structures to be referenced before they're fully initialized.

Microsoft is aware of this issue and is investigating a fix. Until a fix is available, use one of the following mitigations:

  • Enable trace flag 4696 to opt out of the code change that causes this issue. If you enable this trace flag, monitoring queries that query sys.dm_exec_requests or sys.sysprocesses on secondary replicas might return error "976" or error "978" as they did before you installed this update.
  • Avoid queries against sys.dm_exec_requests for databases that are recovering.
  • Uninstall this update.

Improvements and fixes included in this update

A downloadable 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. 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 "#bkmk_NNNNNNN" format. You can then share this URL with others so that they can jump directly to the desired fix in the table.

Bug Reference Description Fix area Component Platform
5442244 This fix addresses a security validation issue in SQL Server Agent if SQL Server Agent loads task-agent components. This fix strengthens security validation. SQL Server Engine SQL Agent Windows
5456055 This fix addresses reliability and security issues in SQL Server Agent if it processes specific input. SQL Server Engine SQL Agent Linux;Windows
5459624 This fix addresses an issue in which the SQL WMI Provider processes malformed input incorrectly while preserving existing behavior for valid input. SQL Server Engine WMI Management Provider (SqlMgmProvider) Windows
5481779 This fix addresses an issue that affects the security and reliability of SQL Server Agent under specific operating conditions. SQL Server Engine SQL Agent Linux;Windows
5482367 This fix addresses identifier handling and input validation in replication stored procedures to ensure that supplied and stored values are processed correctly. SQL Server Engine Replication Linux;Windows
5482368 This fix addresses replication stored procedures that incorrectly process identifiers that contains longer or special characters. SQL Server Engine Replication Linux;Windows
5482369 This fix addresses replication stored procedures that incorrectly process identifiers that contain special characters. SQL Server Engine Replication Linux;Windows
5482370 This fix addresses input validation for a merge replication metadata stored procedure to ensure that supplied values are processed reliably. SQL Server Engine Replication Linux;Windows
5482371 This fix addresses a replication stored procedure that handles a caller-supplied path value. SQL Server Engine Replication Linux;Windows
5482372 This fix addresses input validation for parameters used by replication stored procedures to ensure that supplied values are processed reliably. SQL Server Engine Replication Linux;Windows
5486767 This fix addresses an issue in which the SUBSTRING function reads beyond the allocated buffer if it processes malformed double-byte character set (DBCS) varchar input. The issue occurs in a natively compiled In-Memory Online Transaction Processing (OLTP) procedure. SQL Server Engine In-Memory OLTP Linux;Windows
5486768 This fix addresses an issue in which converting or truncating an NVARCHAR value that contains an Ideographic Variation Sequence (IVS) under a Variation Selector Sensitive (_VSS) collation causes an access violation. The issue occurs in a natively compiled In-Memory Online Transaction Processing (OLTP) procedure and causes the server to stop responding. SQL Server Engine In-Memory OLTP Linux;Windows
5486787 This fix addresses an issue in which streaming NVARCHAR(MAX) data with TEXTSIZE truncation under a Variation Selector Sensitive (_VSS) collation causes a heap buffer overwrite or a server to stop responding. The issue occurs in a natively compiled In-Memory Online Transaction Processing (OLTP) procedure if the procedure uses small Tabular Data Stream (TDS) packet sizes. SQL Server Engine In-Memory OLTP Linux;Windows
5487425 This fix improves the validation of responses from S3-compatible external storage endpoints during external data access. SQL Server Engine PolyBase Linux;Windows
5489020 This fix addresses a security vulnerability in Microsoft Entra authentication login handling in SQL Server. SQL Server Engine Security Infrastructure Linux;Windows
5490416 This fix addresses the internal validation of backup metadata that's processed by the SQL Server Volume Shadow Copy Service (VSS) Writer to improve the handling of malformed or undersized metadata and ensure that it's rejected safely. SQL Server Engine Backup Restore Windows
5496455 This fix addresses arithmetic overflow and out-of-bounds memory access issues in the SQL Server LEFT_SHIFT and RIGHT_SHIFT functions if these functions process specially crafted shift values or binary inputs. These issues can cause the SQL Server process to terminate unexpectedly. SQL Server Engine Query Execution Linux;Windows
5496925 This fix addresses a security issue in SQL Server by updating how SQL Server processes and outputs certain internal event data to help protect information. SQL Server Engine Programmability Linux;Windows
5497756 This fix addresses a vulnerability that affects the SQL Server managed backup to the Microsoft Azure stored procedures, managed_backup.sp_get_encryption_option and managed_backup.sp_do_backup. Customers who use managed backup should apply this update through the standard SQL Server servicing process. SQL Server Engine Backup Restore Linux;Windows
5499333 This fix addresses a security issue in SQL Server in which insufficient validation in Extended Events can cause memory corruption. SQL Server Engine Extended Events Linux;Windows
5499789 This fix addresses a remote code execution vulnerability in which a user with administrative permissions modifies PolyBase service command-line parameters to activate a deprecated feature that runs the Data Warehouse (DW) Engine and Data Movement Service (DMS) control and data channels on raw Transmission Control Protocol (TCP) listeners. This deprecated feature is intended to run under a single SQL Platform Abstraction Layer (SQLPAL) instance in Kubernetes by having only the SQL Server port exposed outside the pod. The fix prevents PolyBase services from opening raw TCP listeners for the DW Engine and DMS control and data channels if the services start by having modified command-line parameters. SQL Server Engine PolyBase Linux;Windows
5499897 This fix addresses an XML data type handling bug in Document Type Definition (DTD) attribute lists. SQL Server Engine XML Linux;Windows
5502242 This fix addresses a security vulnerability in configuration processing. SQL Server Engine PolyBase Linux;Windows
5502651 This fix addresses an improper input validation issue in SQL Server that allows an authenticated user to disclose a limited amount of memory. This fix strengthens input validation. SQL Server Engine Query Execution Linux;Windows
5503123 This fix addresses an integer overflow in the SQL Server XML reader that occurs if SQL Server processes a specially crafted XML format file through OPENROWSET(BULK...) or BULK INSERT. The integer overflow can cause the SQL Server process to stop responding or terminate unexpectedly. SQL Server Engine XML Linux;Windows
5503130 This fix addresses an access violation that occurs if SQL Server processes a query with an extremely large OPTION (USE PLAN) XML declaration. This access violation can cause the SQL Server process to terminate unexpectedly. SQL Server Engine XML Linux;Windows
5504496 Fixes an issue where the data_sensitivity_information field is not consistently populated in audit records generated by SCHEMA_OBJECT_ACCESS_GROUP. This update ensures that sensitivity information is reliably included in all applicable audit records. SQL Server Engine Security Infrastructure Linux;Windows
5505126 This fix addresses an issue in which the class ID lookup call reads arbitrary memory. SQL Server Engine Replication Windows
5505436 This fix adds bounds validation for embedded attestation fields. SQL Server Engine Replication Windows
5505446 This fix strengthens Object Store Format (OSF) deserialization against malformed or malicious stream data. SQL Server Engine Replication Windows
5505475 This fix strengthens buffer length validation checks within the enclave code. SQL Server Engine Replication Windows
5506054 This fix addresses an improper input validation issue in SQL Server that allows an authenticated user to disclose in‑memory information. This fix strengthens input validation. SQL Server Engine Query Execution Linux;Windows
5506114 This fix addresses an improper input validation issue in SQL Server in which an authenticated user can provide a pointer that SQL Server dereferences and reads but does not execute. This issue can cause dump file generation or out-of-memory conditions. This fix strengthens input validation. SQL Server Engine Query Execution Linux;Windows
5529155 This fix addresses improper field offset validation in the SqlDataRecord.SetBytes API for sql_variant values. This fix prevents an out-of-bounds heap write that can cause denial of service or elevation of privilege in SQL Server installations and Azure SQL Managed Instances that have common language runtime (CLR) enabled. SQL Server Engine Programmability Windows
5529194 This fix improves the handling of input to Showplan to enhance security and reliability. SQL Server Engine Query Store Windows
5529338 This fix addresses an issue that affects the protection of internal replication data during processing operations. SQL Server Engine Replication Linux;Windows
5529350 This fix addresses an issue in Merge Replication that affects the handling of text data during processing operations. SQL Server Engine Replication Linux;Windows
5529362 This fix addresses an issue in replication operations that affects validation and handling to enhance security and reliability. SQL Server Engine Replication Linux;Windows
5529374 This update includes security and reliability improvements for the Queued Updating Subscriptions in Transactional Replication. SQL Server Engine Replication Windows
5529386 This update includes security and reliability improvements for the Queued Updating Subscriptions in Transactional Replication. SQL Server Engine Replication Windows

How to obtain and install the update

Method 1: Windows Update

This update is available through Windows Update. When you turn on automatic updating, this update will be downloaded and installed automatically. For more information about how to turn on automatic updating, see Windows Update: FAQ.

Method 2: Microsoft Update Catalog

To get the standalone package for this update, go to the Microsoft Update Catalog website.

Note

  • The detection logic has been updated for this and future security releases that are posted to the Microsoft Update Catalog website. For more information, see Updates to the Microsoft Update detection logic for SQL Server servicing.
  • This update is made available through the Microsoft Update Catalog for all servers that are running SQL Server, even if Reporting Services is not installed. Installing this security update is optional for computers that do not host Microsoft SQL Server Reporting Services.

Method 3: Microsoft Download Center

The following file is available for download from the Microsoft Download Center:

Download icon Download the package now

How to obtain or download the latest cumulative update package for Linux

To update SQL Server 2022 on Linux to the latest CU, you must first have the Cumulative Update repository configured. Then, update your SQL Server packages by using the appropriate platform-specific update command.

For installation instructions and direct links to the CU package downloads, see the SQL Server 2022 Release Notes.

More information

Prerequisites

To apply this update, you must have SQL Server 2022 or any SQL Server 2022 CU release through this SQL Server 2022 CU26 GDR installed.

Security update deployment information

For deployment information about this update, see Deployments - Security Update Guide.

File hash information

File name SHA256 hash
SQLServer2022-KB5122768-x64.exe 5BF11FCBDA98F5D8F0F35740F7FD0ED9421B1359B8E87B7EDE0325A6EF9F40AA

File information

The English version of this package has the file attributes (or later file attributes) that are listed in the following worksheet. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it's converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

For all supported x64-based versions - Download the list of files that are included in security update 5122768.

Information about protection and security

Protect yourself online: Windows Security support

Learn how we guard against cyber threats: Microsoft Security