EUVD-2026-43857
GHSA-pr8p-w98x-r7fw
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local EoP requiring an existing low-privileged foothold (AV:L, PR:L), no user interaction, with kernel-context compromise yielding full C/I/A impact.
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 TCP/IP allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege elevation in the Microsoft Windows TCP/IP networking stack lets an already-authenticated, low-privileged user corrupt kernel memory via a use-after-free (CWE-416) and gain SYSTEM-level control. The flaw affects a broad range of client and server SKUs from Windows 10 1607 through Windows 11 26H1 and Windows Server 2012 through Server 2025, including Server Core installations. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already possess authenticated local access with at least low/standard-user privileges on the target Windows system (CVSS PR:L, AV:L); it cannot be triggered remotely and needs no user interaction (UI:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score is 7.8 (High) with vector AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - local attack vector, low complexity, low privileges required, no user interaction, and high impact to confidentiality, integrity and availability. … 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 host - for example through a phishing payload or a compromised standard user account - invokes crafted TCP/IP operations that trigger the use-after-free in the kernel networking stack. By grooming kernel memory to reclaim the freed object with attacker-controlled data, they corrupt kernel state to execute code as SYSTEM, completing a local privilege escalation. … |
| Remediation | Apply the vendor-released Microsoft security update for CVE-2026-50306 for your specific Windows build; the patch is available per the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50306, which lists the exact fixed KB/build for each SKU (deploy the version matching your OS). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows systems affected by this vulnerability, including Windows 10 (1607 through current), Windows 11 (all versions through 26H1), Windows Server 2012 through 2025, and Server Core installations; prioritize server systems and administrative workstations. …
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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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