CVE-2026-45598
Analyzed Analyzed - Analysis Complete

Use After Free in Windows Ancillary Function Driver for WinSock

Publication date: 2026-06-09

Last updated on: 2026-06-11

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
2026-06-11
Generated
2026-06-30
AI Q&A
2026-06-09
EPSS Evaluated
2026-06-28
NVD
CVE-2026-45598
EUVD
EUVD-2026-35558

Affected Vendors & Products

Showing 24 associated CPEs
Vendor Product Version / Range
microsoft windows_server_2012 r2
microsoft windows_server_2012 *
microsoft windows_10_1607 to 10.0.14393.9234 (exc)
microsoft windows_10_1607 to 10.0.14393.9234 (exc)
microsoft windows_10_1809 to 10.0.17763.8880 (exc)
microsoft windows_10_1809 to 10.0.17763.8880 (exc)
microsoft windows_10_21h2 to 10.0.19044.7417 (exc)
microsoft windows_10_21h2 to 10.0.19044.7417 (exc)
microsoft windows_10_21h2 to 10.0.19044.7417 (exc)
microsoft windows_10_22h2 to 10.0.19045.7417 (exc)
microsoft windows_10_22h2 to 10.0.19045.7417 (exc)
microsoft windows_10_22h2 to 10.0.19045.7417 (exc)
microsoft windows_11_23h2 to 10.0.22631.7219 (exc)
microsoft windows_11_23h2 to 10.0.22631.7219 (exc)
microsoft windows_11_24h2 to 10.0.26100.8655 (exc)
microsoft windows_11_24h2 to 10.0.26100.8655 (exc)
microsoft windows_11_25h2 to 10.0.26200.8655 (exc)
microsoft windows_11_25h2 to 10.0.26200.8655 (exc)
microsoft windows_11_26h1 to 10.0.28000.2269 (exc)
microsoft windows_11_26h1 to 10.0.28000.2269 (exc)
microsoft windows_server_2016 to 10.0.14393.9234 (exc)
microsoft windows_server_2019 to 10.0.17763.8880 (exc)
microsoft windows_server_2022 to 10.0.20348.5256 (exc)
microsoft windows_server_2025 to 10.0.26100.32995 (exc)

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.

Attack-Flow Graph

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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.

Mitigation Strategies

To mitigate this vulnerability, 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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