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SQL Server 2016 SP3 + GDR SQL Server 2016 SP3 + GDR Security update
Patch Tuesday

KB5084821

KB5084821: Security update for SQL Server 2016, GDR branch, April 2026. MSDASQL linked-server queries fail with error 7416

In short

The update addresses two SQL Server elevation-of-privilege vulnerabilities. Linked-server queries using MSDASQL with a provider string fail with error 7416.

Does it affect you? Applies to: Devices running the x64 version of SQL Server 2016 SP3 GDR. The listed fixes affect SQL Server on Linux and Windows, and SQL Agent on Windows.

Build
13.0.6485.1
Servicing branch
GDR
Security
2 fixed
Restart
Required
Review notes Additional details from the official release notes (4) Read notes
  • This page The stricter connection check can reject some linked-server configurations that use MSDASQL and a provider string; it does not say that every such query fails.
  • In short The stricter connection check can reject some linked-server configurations that use MSDASQL and a provider string; it does not say that every such query fails.
  • In detail The stricter connection check can reject some linked-server configurations that use MSDASQL and a provider string; it does not say that every such query fails.
  • Known issues The stricter connection check can reject some linked-server configurations that use MSDASQL and a provider string; it does not say that every such query fails.

The official sources are linked at the end of the page.

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

  • Addresses a vulnerability that could let a low-privileged SQL Server user gain sysadmin permissions through linked servers.1
    Applies to SQL Server on Linux and Windows.

SQL Agent

  • Resolves a SQL injection issue that could let an authorized attacker elevate privileges over a network.2
    Applies to SQL Server on 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 fail with error 7416: access to the remote server is denied because no login-mapping exists.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
KB5077474, KB5068401, KB5065226, KB5063762
+5 earlier KB5058718, KB5046855, KB5046063, KB5042207, KB5040946
Replaced by
KB5089271
VersionBuildChannel
2016 13.0.6485.1 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 2016
511.1 MB
sqlserver2016-kb5084821-x64.exe Main update · KB5084821 SHA-1: b6c385e9…6f2364

Updated components

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

Top changed componentsFiles
SQL Server Engine77
SQL Server Analysis Services3

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 permissions. 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 the MSDASQL (OLE DB Provider for ODBC Drivers) provider and specify a provider string (@provstr) fail and return the following error message: 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 3/5, clarity 4/5, completeness 4/5. 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