EUVD-2026-73885
GHSA-g853-w9cq-jqfm
Severity by source
AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Local access and admin rights (PR:H) required to reach Secure Kernel interface; scope change (S:C) reflects crossing VBS VTL1 boundary with full downstream impact.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
4DescriptionCVE.org
Untrusted pointer dereference in Windows Secure Kernel Mode allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation in Windows 11 Secure Kernel Mode (Virtualization-Based Security / VTL1) allows a locally authorized attacker with high privileges to cross the VBS isolation boundary and achieve full C:H/I:H/A:H impact on the Secure Kernel context. The root cause is CWE-822 (Untrusted Pointer Dereference): attacker-controlled pointer values are dereferenced without validation inside Secure Kernel Mode, enabling code execution at the VTL1 trust level. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated local session with high privileges - specifically, the attacker must hold local administrator or SYSTEM rights on a Windows 11 26H1 system (builds 10.0.28000.0 through 10.0.28000.2953) with VBS/Secure Kernel Mode active. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H scores 8.2 and accurately reflects the exploitation profile: local access is required, no user interaction is needed, but high privileges (admin or SYSTEM on VTL0) are a prerequisite - this is not a privilege escalation from a standard user account. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the Microsoft patch that brings Windows 11 26H1 to build 10.0.28000.2954 or later, available via Windows Update and the Microsoft Update Catalog; the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83939 provides direct download links and deployment guidance. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and inventory all Windows 11 systems with Virtualization-Based Security enabled, prioritizing those handling sensitive data or providing security infrastructure. …
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External POC / Exploit Code
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