EUVD-2026-56668
GHSA-wwfh-hmvc-m8r5
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local-only vector with race-condition complexity requires a pre-existing low-privilege foothold; full C/I/A impact reflects kernel-level SYSTEM control with no scope change.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Use after free in Windows Kernel allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation via use-after-free in the Windows Kernel affects Windows 11 (versions 23H2, 24H2, 25H2, and 26H1) and Windows Server 2025, enabling a locally authenticated low-privileged attacker to elevate to SYSTEM-level control. The CWE-416 root cause combined with high attack complexity (AC:H) indicates exploitation likely requires precise timing or race-condition engineering rather than a trivial one-shot trigger. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to hold an active, locally authenticated session on the target system with at least low-level privileges - confirmed by CVSS AV:L and PR:L. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.0 score with vector AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H accurately reflects a serious but constrained local privilege escalation: the attacker must already hold a local low-privilege foothold, and the high attack complexity means exploitation is not mechanically reliable without engineering specific preconditions such as a race condition or controlled memory state. … 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 vendor-released patch via Windows Update, Windows Server Update Services (WSUS), or Microsoft Update Catalog, targeting the following minimum fixed build versions confirmed by EUVD-2026-56668: 10.0.22631.7517 or later for Windows 11 23H2, 10.0.26100.9168 or later for Windows 11 24H2 and Windows Server 2025 (including Server Core), 10.0.26200.9168 or later for Windows 11 25H2, 10.0.28000.2704 or later for Windows 11 26H1, and 10.0.26100.33296 or later for Windows Server 2025 standard and Server Core installations. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify and inventory all Windows 11 (23H2, 24H2, 25H2, 26H1) and Windows Server 2025 systems across your environment, prioritizing servers handling sensitive workloads or administrative functions. …
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Same weakness CWE-416 – Use After Free
View allSame technique Use After Free
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External POC / Exploit Code
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