Summary
Impact: Elevation of Privilege. Microsoft rating: Critical. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
How could an attacker exploit this vulnerability?
An attacker who already has kernel-level access could exploit this vulnerability by submitting a specially crafted Code Integrity policy to an affected system. Successful exploitation could allow the attacker to execute code in Virtual Trust Level 1 (VTL1).
What privileges could be gained by an attacker who successfully exploited this vulnerability?
An attacker who successfully exploited this vulnerability could gain Virtual Trust Level 1 (VTL1) privileges.
Security updates
10.0.28000.2954 — https://support.microsoft.com/help/5124012
Vulnerabilities 1
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High 8.2
Windows Secure Kernel Mode Elevation of Privilege Vulnerability
Untrusted pointer dereference in Windows Secure Kernel Mode allows an authorized attacker to elevate privileges locally.
Revision history
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#1
Information published.
References
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CVE-2026-83939 Windows Secure Kernel Mode Elevation of Privilege Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83939
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Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
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Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
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Common Vulnerability Scoring System
https://www.first.org/cvss