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SQL Server 2025 GDR SQL Server 2025 GDR Security update
Patch Tuesday

KB5084814

KB5084814: Security update for SQL Server 2025, GDR branch, April 2026. Linked-server privilege flaw addressed; MSDASQL queries can fail

In short

The update addresses two Important elevation-of-privilege vulnerabilities, with fixes involving linked servers and SQL Agent. Some linked-server queries using MSDASQL can fail with error 7416 after installation.

Does it affect you? Applies to: SQL Server 2025 on Windows and Linux, all editions. The package is for x64 systems.

Build
17.0.1110.1
Servicing branch
GDR
Security
2 fixed
Restart
Required

For servers on the GDR branch: they get security fixes only. Servers that install cumulative updates (CU branch) get a separate update. Which branch am I on?

What changes

Fixes 2 changes

Linked Server

For: SQL Server instances on Linux and Windows

  • The update addresses a flaw that could let a low-privileged SQL Server user gain sysadmin permission through linked servers.1
    The fix applies to Linux and Windows.

SQL Agent

For: SQL Server instances on Windows

  • The update resolves an issue where special elements in SQL commands could let an authorized attacker elevate privileges over a network.2
    The SQL injection fix applies to Windows.

Known issues

  1. Open Affects: Organizations and IT administrators

    Linked server queries that use MSDASQL fail with error 7416

    Linked-server queries that use the MSDASQL provider and specify a provider string (@provstr) fail with error 7416. A stricter Database Engine connection check can reject certain configurations, even when earlier builds allowed them.3

    Workaround status No workaround yet

    Microsoft has not published a manual workaround for this issue yet. Monitor release health until a resolving update is available.

Technical details

Data sheet · Security · Downloads · Components Click to collapse or expand

Data sheet

Released
2026-04-14
Classification
Security Updates
Type
Cumulative update
Servicing branch
GDR
Restart
Required
Replaces
KB5077468, KB5073177
Replaced by
KB5091223
VersionBuildChannel
2025 17.0.1110.1 General availability

Security

2 vulnerabilities fixed
2 important
VulnerabilitySeverityCVSS
CVE-2026-32167
SQL Server Elevation of Privilege Vulnerability
 Important 6.7
CVE-2026-32176
SQL Server Elevation of Privilege Vulnerability
 Important 6.7

Downloads (Microsoft Update Catalog)

Package 2025
326.3 MB
sqlserver2025-kb5084814-x64.exe Main update · KB5084814 SHA-1: dc3d57ba…62c975

Updated components

140 files changed since the previous update for the same versions.

Top changed componentsFiles
SQL Server Engine112
SQL Server PolyBase2

Sources

Updated
Cited passages from Microsoft's official notes (3)
  1. 1. This fix addresses an elevation of privilege vulnerability in SQL Server linked servers that allows a low-privileged SQL Server user to gain sysadmin permission. support.microsoft.com
  2. 2. This fix resolves an issue in SQL Server in which improper neutralization of special elements in SQL commands (SQL injection) allows an authorized attacker to elevate privileges over a network. support.microsoft.com
  3. 3. Linked server queries that use MSDASQL fail with error 7416 support.microsoft.com
Checked automatically: 8 of 8 checks passed, 3 quoted passages · compared with Microsoft's page on Sep 26, 2026
  • Quotes found in the official pages: passed
  • Numbers found in the sources: passed
  • Vulnerabilities from the dossier only: passed
  • Links to allowed domains only: passed
  • Every official change covered: passed
  • Readable plain text: passed
  • Changes confirmed by the file list: passed
  • Sources agree: passed

A second AI read the text against the sources: correctness 4/5, clarity 5/5, completeness 5/5. How we work

Published by The Update Bureau. Written with AI from Microsoft's own documents, checked by rules and a second AI. How we work · Report a mistake