CVE-2026-45638
Undergoing Analysis Undergoing Analysis - In Progress
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-2026-45638
EUVD
EUVD-2026-35564
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
microsoft windows_ancillary_function_driver_for_winsock *
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-122 A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
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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 elevate their privileges locally on the affected system.

Impact Analysis

The impact of this vulnerability is that an attacker who already has some level of access to the system can exploit it to gain higher privileges. This can lead to full control over the affected system, allowing the attacker to perform actions that require elevated permissions.

Mitigation Strategies

To mitigate this vulnerability, it is important to apply the security updates provided by Microsoft as soon as they are available.

Since the vulnerability allows local privilege escalation via the Windows Ancillary Function Driver for WinSock, limiting local user access and ensuring systems are updated can reduce risk.

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