CVE-2026-45601
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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-2026-45601
EUVD
EUVD-2026-35557
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-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.
CWE-416 The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
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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 authorized attacker can gain elevated privileges on the local system. This means the attacker could perform actions with higher permissions than originally granted, potentially compromising system integrity, confidentiality, and availability.

Mitigation Strategies

To mitigate this vulnerability, it is recommended to apply the security updates provided by Microsoft for the Windows Ancillary Function Driver for WinSock as soon as possible.

Since the vulnerability allows local privilege escalation, limiting local user access and ensuring that only authorized users have access to the affected system can help reduce risk until patches are applied.

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