CVE-2026-83939

Windows Secure Kernel Mode Elevation of Privilege Vulnerability

CVE-2026-83939 is fixed in 2 products on 1 platform, first by KB5124012, released September 8, 2026. It is not reported as exploited. Patch Radar priority: Urgent.

Urgent

CVSS

8.2

Critical

Exploitation

None reported

Exploitation Less Likely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0035

28th percentile

<p>Untrusted pointer dereference in Windows Secure Kernel Mode allows an authorized attacker to elevate privileges locally.</p>

Where it's fixed

Product	Fixed in	Fix	Released
Microsoft
Windows 11 Version 26H1 for ARM64-based Systems	28000.2954	KB5124012	Sep 8, 2026
Windows 11 version 26H1 for x64-based Systems	28000.2954	KB5124012	Sep 8, 2026

Details

Published
September 8, 2026
Weakness
Untrusted Pointer Dereference
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83939

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