EUVD-2026-73521
GHSA-6crh-j8gc-69mr
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local attack, low-privileged user required, high complexity for heap-grooming/race-condition exploitation; successful escalation yields full kernel-level C/I/A compromise.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Numeric truncation error in Windows Kernel allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation in the Windows Kernel via a numeric truncation error that leads to a heap-based buffer overflow allows a local low-privileged attacker to gain full SYSTEM-level control. The vulnerability spans virtually the entire active Windows ecosystem - from Windows 10 1607 and Windows Server 2012 through Windows 11 26H1 and Windows Server 2025 - making the blast radius exceptionally broad. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated local user session on the target Windows system - the CVSS vector specifies PR:L, meaning at minimum a low-privileged OS account (local or domain user) with the ability to execute code on the machine. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS base score of 7.0 with vector AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H correctly captures the risk profile: high impact if exploitation succeeds, but AC:H substantially reduces the practical exploitability window. … 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-released security updates for the affected Windows build immediately via Windows Update, WSUS, or Microsoft Update Catalog. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify and categorize all Windows systems by version and criticality; prioritize domain controllers, critical servers, and internet-facing systems. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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