CVE-2026-42911
Awaiting Analysis Awaiting Analysis - Queue
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.
CVSS Scores
EPSS Scores
Probability:
Percentile:
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-2026-42911
EUVD
EUVD-2026-35723
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
microsoft windows_ancillary_function_driver_for_winsock *
Helpful Resources
Exploitability
CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
Attack-Flow Graph
AI Quick Actions
Instant insights powered by AI
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 vulnerability can impact you by allowing an authorized attacker to elevate their privileges on your system. This means the attacker could gain higher-level access than intended, potentially leading to unauthorized actions or control over the system.

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 they become available.

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

Chat Assistant
Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-42911. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70
EPSS Chart