CVE-2026-45598
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Use After Free in Windows Ancillary Function Driver for WinSock

Publication date: 2026-06-09

Last updated on: 2026-06-09

Assigner: Microsoft Corporation

Description
Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
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Meta Information
Published
2026-06-09
Last Modified
2026-06-09
Generated
2026-06-10
AI Q&A
2026-06-09
EPSS Evaluated
N/A
NVD
CVE-2026-45598
EUVD
EUVD-2026-35558
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
microsoft windows_ancillary_function_driver_for_winsock *
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-362 The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.
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Executive Summary

This vulnerability is a use after free issue in the Windows Ancillary Function Driver for WinSock. It allows an authorized attacker to execute code that elevates their privileges locally on the affected system.

Impact Analysis

The impact of this vulnerability is an elevation of privilege, meaning an attacker with some level of access can gain higher privileges on the system. This can lead to full control over the affected Windows system, compromising confidentiality, integrity, and availability.

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