EUVD-2026-73489
GHSA-8rj7-6qp9-5fmj
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local kernel driver exploitation requires existing low-privileged local access (AV:L/PR:L); successful heap corruption in ring-0 yields full SYSTEM control (C:H/I:H/A:H) with no interaction needed.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Integer underflow (wrap or wraparound) in Windows Kernel Mode Driver allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Kernel Mode Driver affects virtually all current and several end-of-life Windows releases, from Server 2012 through Windows 11 26H1 and Server 2025. A low-privileged local attacker can trigger an integer underflow/wraparound in the kernel driver that manifests as a heap-based buffer overflow (CWE-122) in ring-0, enabling elevation to SYSTEM. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated low-privileged local account on the target system (PR:L per CVSS) with the ability to execute arbitrary code - achievable via interactive logon, Remote Desktop, a terminal service session, or malware already running under a standard user context. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The provided CVSS 7.8 vector (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) is well-calibrated for this class of vulnerability: local, low-complexity, requiring only a standard user account, with full kernel-level impact on confidentiality, integrity, and availability. … 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 Microsoft's cumulative security updates that deliver patched kernel builds for each affected Windows version: Windows 10 21H2 → 10.0.19044.7725 or later; Windows 10 22H2 → 10.0.19045.7725 or later; Windows 10 1607 / Server 2016 → 10.0.14393.9512 or later; Windows 10 1809 / Server 2019 → 10.0.17763.9245 or later; Windows 11 23H2 → 10.0.22631.7582 or later; Windows 11 24H2 / Server 2025 → 10.0.26100.9445 (client) / 10.0.26100.33438 (server) or later; Windows 11 25H2 → 10.0.26200.9445 or later; Windows 11 26H1 → 10.0.28000.2954 or later; Server 2022 → 10.0.20348.5622 or later; Server 2012 / Server 2012 R2 → 6.2.9200.26349 / 6.3.9600.23397 or later (requires active ESU subscription). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and inventory all Windows systems across your organization (Windows Server 2012 through 2025, Windows 10 all versions, Windows 11 through version 26H1) and obtain the latest Microsoft monthly cumulative update; validate compatibility in isolated staging environments before broader deployment. …
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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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