EUVD-2026-43929
GHSA-3gwp-qggg-mg8c
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local low-privileged attacker (AV:L/PR:L), high complexity due to a use-after-free race (AC:H), full SYSTEM compromise gives C:H/I:H/A:H with no scope change.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:H/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 Microsoft Windows Kernel lets an already-authenticated attacker win a use-after-free race (CWE-416) to gain SYSTEM-level control, affecting a broad range of client and server builds from Windows 10 1607 and Windows Server 2012 through Windows 11 26H1 and Windows Server 2025. Microsoft has released a patch and there is no public exploit identified at time of analysis. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already possess local, authenticated access with at least low privileges (PR:L) and the ability to execute code on the target Windows host; there is no network vector and no user interaction is needed (AV:L/UI:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H) describes a local, low-privilege attack requiring high complexity but yielding total system compromise (C:H/I:H/A:H). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already gained a foothold as a standard, low-privileged user - for example via phishing, a malicious application, or a compromised service account - runs a local exploit that repeatedly triggers the vulnerable kernel operation to win the use-after-free race, reallocating the freed object with attacker-controlled data. On success the kernel memory corruption is leveraged to escalate to SYSTEM, giving full control of the host. … |
| Remediation | Patch available per vendor advisory: apply the Microsoft security update for CVE-2026-50397 delivered through the monthly cumulative/quality update for each affected SKU, using the exact patched build listed for your edition at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50397 (the input does not provide a single fixed version string, so consult the advisory for the per-SKU KB and build). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and inventory all Windows 10, 11, and Windows Server 2012-2025 systems to assess organizational exposure. …
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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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