EUVD-2026-44143
GHSA-4pvm-wg2g-h8cw
Severity by source
AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Local authenticated user (AV:L/PR:L) triggers a low-complexity kernel UAF with no interaction; scope changes (S:C) as compromise crosses into the OS with full C/I/A impact.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Use after free in Windows Kernel allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Kernel lets an already-authenticated, low-privileged attacker on Windows 11 (24H2, 25H2, 26H1) and Windows Server 2025 corrupt kernel memory via a use-after-free and gain SYSTEM-level control. The CVSS 3.1 score of 8.8 is elevated by a scope change (S:C), reflecting that kernel compromise crosses the boundary from user context to the OS itself. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires an authenticated local foothold: the attacker must already be able to execute code on the target as a low-privileged user (PR:L, AV:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H) describes a locally-exploitable, low-complexity, low-privilege escalation with full confidentiality, integrity, and availability impact and a scope change into the kernel - a classic high-value EoP for post-compromise chaining. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already gained low-privileged code execution on a Windows 11 24H2 or Windows Server 2025 host - for example via a phishing payload or a compromised standard user account - triggers the kernel use-after-free by manipulating the vulnerable object's lifecycle, reclaims the freed allocation with crafted data, and pivots the dangling pointer into arbitrary kernel read/write to elevate to SYSTEM. No user interaction is required and attack complexity is low. … |
| Remediation | Apply the Microsoft security update for CVE-2026-50687 via Windows Update / WSUS; the patch is available per vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50687 (consult that page for the exact fixed KB/build per affected Windows 11 and Server 2025 release, since the input does not name a specific version number). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 11 (versions 24H2, 25H2, 26H1) and Windows Server 2025 systems across the organization to establish scope for remediation. …
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Same weakness CWE-416 – Use After Free
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External POC / Exploit Code
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