EUVD-2026-43938
GHSA-r3m2-hccm-c492
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local privilege escalation requiring an authenticated low-privileged user (AV:L/PR:L), low complexity, no user interaction, yielding full SYSTEM compromise (C:H/I:H/A:H).
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/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 affects Windows 11 (24H2, 25H2, 26H1) and Windows Server 2025 (including Server Core), where an authorized attacker can exploit a use-after-free (CWE-416) memory-corruption condition to elevate privileges to SYSTEM. The flaw was reported by Microsoft, which has released a patch, and carries a CVSS 7.8 rating driven entirely by high confidentiality, integrity, and availability impact once local access is obtained. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already have local, authenticated access with the ability to run code on the target (PR:L, AV:L) - this is a privilege-escalation bug, not a remote entry point. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H is internally consistent with the description: local attack vector, low complexity, low privileges required (a standard authenticated user), no user interaction, unchanged scope, and full compromise of the local system. … 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 or Windows Server 2025 host - for example via a phishing payload or a compromised standard user account - runs a crafted program that manipulates the vulnerable kernel object to trigger the use-after-free. By controlling the freed-then-reallocated memory, the attacker corrupts kernel structures to gain arbitrary read/write and elevates to SYSTEM. … |
| Remediation | Apply the Microsoft security update for CVE-2026-50436 (patch available per vendor advisory) to all affected systems - Windows 11 24H2/25H2/26H1 and Windows Server 2025 including Server Core - via the standard cumulative update; consult the MSRC update guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50436 for the exact KB and build numbers, which were not provided in this data set. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and inventory all systems running Windows 11 (24H2, 25H2, 26H1) and Windows Server 2025, flagging production and data-handling servers for priority remediation. …
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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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