CVE-2015-2366

Windows 7/8/8.1, Server 2008/2012, RT - Privilege Escalation via win32k.sys

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 2 public exploits for CVE-2015-2366. PoCs published by Nils Sommer, OpenSISE.

AI-analyzed exploit summary This exploit demonstrates a use-after-free vulnerability in Windows' DeferWindowPos function when manipulated from multiple threads, leading to potential privilege escalation or denial of service. The PoC triggers a race condition by calling EndDeferWindowPos from a separate thread while DeferWindowPos is executing.

Description

win32k.sys in the kernel-mode drivers in Microsoft Windows 7 SP1, Windows Server 2008 R2 SP1, Windows 8, Windows 8.1, Windows Server 2012 Gold and R2, and Windows RT Gold and 8.1 allows local users to gain privileges via a crafted application, aka "Win32k Elevation of Privilege Vulnerability."

Exploits (2)

exploitdb WORKING POC VERIFIED
by Nils Sommer · textdoswindows_x86
https://www.exploit-db.com/exploits/38266

This exploit demonstrates a use-after-free vulnerability in Windows' DeferWindowPos function when manipulated from multiple threads, leading to potential privilege escalation or denial of service. The PoC triggers a race condition by calling EndDeferWindowPos from a separate thread while DeferWindowPos is executing.

Classification
Working Poc 90%
Attack Type
Lpe
Complexity
Moderate
Reliability
Racy
Target: Microsoft Windows (specific versions affected by CVE-2015-2366)
No auth needed
Prerequisites: Multi-threaded environment · Access to create and manipulate windows
devstral-2 · analyzed Feb 16, 2026 Full analysis →
github WORKING POC 31 stars
by OpenSISE · cpoc
https://github.com/OpenSISE/CVE_PoC_Collect/tree/master/BSoD/windows/CVE-2015-2366

This repository contains a functional proof-of-concept exploit for CVE-2015-2366, a use-after-free vulnerability in win32k.sys. The exploit triggers a BSOD (Bugcheck 0xD5) by manipulating window handles and deferred window positions, demonstrating the vulnerability in the Windows kernel.

Classification
Working Poc 95%
Attack Type
Dos
Complexity
Complex
Reliability
Reliable
Target: Microsoft Windows (win32k.sys)
No auth needed
Prerequisites: Windows system with vulnerable win32k.sys
devstral-2 · analyzed Feb 27, 2026 Full analysis →

References (3)

Core 3
Core References
Third Party Advisory, VDB Entry vdb-entry x_refsource_sectrack
http://www.securitytracker.com/id/1032904
Exploit, Third Party Advisory exploit x_refsource_exploit-db
https://www.exploit-db.com/exploits/38266/

Scores

EPSS 0.0372
EPSS Percentile 88.4%

Details

CWE
CWE-264
Status published
Products (8)
microsoft/windows_7
microsoft/windows_8
microsoft/windows_8.1
microsoft/windows_rt
microsoft/windows_rt_8.1
microsoft/windows_server_2008 r2 sp1
microsoft/windows_server_2012
microsoft/windows_server_2012 r2 (3 CPE variants)
Published Jul 14, 2015
Tracked Since Feb 18, 2026