EUVD-2026-44136
GHSA-445v-887f-xx48
Severity by source
AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Local authenticated attacker (AV:L/PR:L) exploiting a timing-dependent kernel UAF (AC:H) that crosses into kernel scope (S:C) yielding full SYSTEM impact (C:H/I:H/A:H).
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:H/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 Microsoft Windows Kernel allows an authenticated attacker to gain SYSTEM-level control by exploiting a use-after-free (CWE-416) memory corruption condition. The flaw affects a broad range of Windows client and server builds - from Windows 10 1607 through Windows 11 26H1 and Windows Server 2012 through Server 2025 - and was reported by Microsoft with a patch available. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already have authenticated, low-privileged local access to the target Windows system (CVSS PR:L, AV:L) - this is a local privilege-escalation flaw, not remotely reachable. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a credible but not top-tier emergency. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already obtained standard-user code execution on a Windows host - for example via phishing, a compromised service account, or a shared terminal server - runs a crafted program that repeatedly triggers the vulnerable kernel code path and, by winning a timing race, reuses freed kernel memory populated with attacker-controlled data. On success, the process elevates to SYSTEM, enabling full host takeover, credential theft, and persistence. … |
| Remediation | Patch available per vendor advisory: apply the Microsoft security update referenced at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50688 via Windows Update or WSUS/Intune, selecting the correct cumulative update for each affected Windows 10/11 and Windows Server build (consult the MSRC update guide for exact KB and build numbers, as no single fix version applies across all SKUs). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and inventory all Windows 10 (version 1607 and later), Windows 11 (through version 26H1), and Windows Server (2012 through 2025) systems across your environment using asset management tools. …
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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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