Untrusted Pointer Dereference in Microsoft Windows - CVE-2026-83939
Published: September 9, 2026
Vulnerability identifier: #VU148311
CSH Severity: Low
CVSS v4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-83939
CWE-ID: CWE-822
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local privileged user to execute code in Virtual Trust Level 1 (VTL1).
The vulnerability exists due to untrusted pointer dereference in Windows Secure Kernel Mode when submitting a specially crafted Code Integrity policy to an affected system. A local privileged user can submit a specially crafted Code Integrity policy to execute code in Virtual Trust Level 1 (VTL1).
Affected software
Microsoft Windows
How to mitigate CVE-2026-83939
Install security update from vendor's website.
Microsoft Windows - update to 11 26H1 10.0.28000.2954