CVE-2026-69301
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Stack-based Buffer Overflow in Windows Win32K

Publication date: 2026-09-08

Last updated on: 2026-09-09

Assigner: Microsoft Corporation

Description
Stack-based buffer overflow in Windows Win32K allows an authorized attacker to elevate privileges over a network.

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Meta Information

Published
2026-09-08
Last Modified
2026-09-09
Generated
2026-09-09
AI Q&A
2026-09-09
EPSS Evaluated
N/A
NVD
CVE-2026-69301

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
microsoft windows_win32k *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-121 A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).

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Executive Summary

This is a stack-based buffer overflow vulnerability in Windows Win32K. It allows an authorized attacker to elevate their privileges over a network by exploiting a flaw that overwrites memory on the stack.

Impact Analysis

An attacker could gain higher-level permissions on your system, potentially allowing them to install programs, view or delete data, or create new accounts with full user rights.

Mitigation Strategies

Apply the latest Windows security updates from Microsoft to patch the Win32K stack-based buffer overflow vulnerability.

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