EUVD-2026-56626
GHSA-24cw-3vqm-36pw
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local-only kernel UAF requiring precise race-condition timing (AC:H); low-privilege local account required (PR:L); successful exploitation yields full kernel-level C/I/A impact 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 allows a locally authenticated low-privilege attacker to gain SYSTEM-level access on Windows 11 and Windows Server 2025. The vulnerability carries a CVSS 7.0 score with high attack complexity (AC:H), indicating exploitation likely requires precise timing or heap-grooming to succeed. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated local user account with at minimum standard (low) privilege - the CVSS PR:L metric confirms this. … 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 signals a high-impact but locally constrained privilege escalation. … 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 patches via Windows Update or WSUS, targeting the following minimum fixed builds per edition: Windows 11 23H2 to build 10.0.22631.7517 or later, Windows 11 24H2 to build 10.0.26100.9168 or later, Windows 11 25H2 to build 10.0.26200.9168 or later, Windows 11 26H1 to build 10.0.28000.2704 or later, and Windows Server 2025 (including Server Core) to build 10.0.26100.33296 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all Windows 11 and Windows Server 2025 instances across your environment and verify patch availability from Microsoft. …
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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
Leaving vuln.today