Type Confusion in Windows Win32K Enables Local Privilege Escalation

Publication date: 2026-01-13

Last updated on: 2026-01-13

Assigner: Microsoft Corporation

Description

Access of resource using incompatible type ('type confusion') in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-01-13

Last Modified

2026-01-13

Generated

2026-07-06

AI Q&A

2026-01-14

EPSS Evaluated

2026-07-05

NVD

CVE-2026-20811

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_win32k	-

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-822	The product obtains a value from an untrusted source, converts this value to a pointer, and dereferences the resulting pointer.
CWE-843	The product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type.

Attack-Flow Graph

Executive Summary

This vulnerability is a type confusion issue in the Windows Win32K component called ICOMP, where an authorized attacker can access a resource using an incompatible type, leading to a local elevation of privileges. [1]

Impact Analysis

An authorized attacker can exploit this vulnerability to elevate their privileges locally on a Windows system, potentially gaining higher-level access than intended. [1]

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