CVE-2026-83842

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Double Free in Windows TCP/IP Stack Allows Local Privilege Escalation

Publication date: 2026-10-13

Last updated on: 2026-10-16

Assigner: Microsoft Corporation

Description

Double free in Windows TCP/IP allows an authorized attacker to elevate privileges locally.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-10-13

Last Modified

2026-10-16

Generated

2026-10-19

AI Q&A

2026-10-14

EPSS Evaluated

2026-10-18

NVD

CVE-2026-83842

EUVD

EUVD-2026-99380

Affected Vendors & Products

Vendor	Product	Version / Range
Microsoft	Windows	10 Version 1607 10.0.14393.0
Microsoft	Windows	10 Version 1809 10.0.17763.0
Microsoft	Windows	10 Version 21H2 10.0.19044.0
Microsoft	Windows	10 Version 22H2 10.0.19045.0
Microsoft	Windows	11 version 23H2 10.0.22631.0
Microsoft	Windows	11 Version 23H2 10.0.22631.0
Microsoft	Windows	11 Version 24H2 10.0.26100.0
Microsoft	Windows	11 Version 25H2 10.0.26200.0
Microsoft	Windows	11 version 26H1 10.0.28000.0
Microsoft	Windows	11 Version 26H2 10.0.26300.0
Microsoft	Windows	Server 2016 10.0.14393.0
Microsoft	Windows	Server 2016 (Server Core installation) 10.0.14393.0
Microsoft	Windows	Server 2019 10.0.17763.0
Microsoft	Windows	Server 2019 (Server Core installation) 10.0.17763.0
Microsoft	Windows	Server 2022 10.0.20348.0
Microsoft	Windows	Server 2025 10.0.26100.0
Microsoft	Windows	Server 2025 (Server Core installation) 10.0.26100.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-415	The product calls free() twice on the same memory address.

Attack-Flow Graph

Executive Summary

This vulnerability is a double free issue in the Windows TCP/IP stack. A double free occurs when a program frees the same memory block twice, which can lead to memory corruption and potentially allow an attacker to execute arbitrary code or elevate privileges.

Impact Analysis

An authorized attacker could exploit this to gain higher privileges on your system, allowing them to perform actions they normally would not be permitted to do. This could include installing programs, viewing or deleting data, or creating new accounts with full user rights.

Compliance Impact

This vulnerability allows local privilege escalation, which could enable unauthorized access to sensitive data or systems. Compliance standards like GDPR and HIPAA require strict access controls and data protection measures. A successful exploit could undermine these controls, potentially leading to non-compliance with regulatory requirements.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the Windows TCP/IP double free vulnerability. Monitor Microsoft's update guide for the specific patch release.

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