EUVD-2026-43859
GHSA-c6c5-jmx4-j33p
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local authenticated code execution needed (AV:L/PR:L), UAF race gives high complexity (AC:H), and success yields SYSTEM with full C/I/A impact.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Use after free in Windows Kernel-Mode Drivers allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Microsoft Windows Kernel-Mode Drivers lets an already-authenticated, low-privileged user corrupt kernel memory to gain SYSTEM-level control. Affected builds include Windows 11 (24H2, 25H2, 26H1) and Windows Server 2025, including Server Core. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already have a valid local, low-privileged account on the target (PR:L) and the ability to execute code locally (AV:L); there is no network vector and no user interaction is needed (UI:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score is 7.0 (High) with vector AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H, meaning local access, high attack complexity, and low existing privileges are required, but the payoff is full confidentiality, integrity, and availability compromise (SYSTEM). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already gained a foothold as a standard (non-admin) user - for example through phishing, a malicious document, or a compromised service account - runs a crafted program that repeatedly triggers the vulnerable kernel driver code path while grooming the kernel heap to reclaim the freed object. On winning the race, they redirect kernel execution to escalate to SYSTEM and disable security tooling. … |
| Remediation | Patch available per vendor advisory - apply the Microsoft security update for your specific Windows build via Windows Update or WSUS/SCCM as tracked at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50393, which lists the exact fixed build number for each affected release (Windows 11 24H2/25H2/26H1 and Windows Server 2025 including Server Core). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and catalog all Windows 11 (24H2, 25H2, 26H1) and Windows Server 2025 instances across the organization to determine patch scope and prioritization. …
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External POC / Exploit Code
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