Windows Win32k Elevation of Privilege Vulnerability
Plan PatchCVSS 7CVE-2026-83841Oct 13, 2026
Microsoft
IT in OT - Windows Server and Active Directory are widely deployed in OT environments
Attack path
Attack VectorLocal
Auth RequiredLow
ComplexityHigh
User InteractionNone needed
Summary
A race condition in the Windows Win32k kernel driver allows an authorized local user to elevate privileges to administrator level. The vulnerability is in concurrent execution of shared kernel resources that lack proper synchronization, enabling a user with standard login access to execute code with system privileges.
What this means
What could happen
A user with standard login access to a Windows system could exploit a race condition in the Win32k kernel driver to gain administrative privileges, allowing them to modify system settings, install malware, or access sensitive data.
Who's at risk
Water utilities and municipal utilities running Windows 10, Windows 11, or Windows Server on engineering workstations, HMI (Human-Machine Interface) systems, data servers, or office computers should prioritize patching. This affects any system where standard users can log in locally, including workstations used by plant operators, IT staff, or contractors with remote access capabilities.
How it could be exploited
An attacker with a local user account on the system exploits a race condition in the Win32k graphics driver by running malicious code that manipulates shared kernel resources during a narrow timing window. This allows the attacker to bypass privilege restrictions and execute code with administrative permissions.
Prerequisites
- Local user account on the affected Windows system
- Ability to execute code as that user (no admin rights required)
- Physical or remote desktop access to the system
Low complexityRequires local user accountRequires local or RDP accessAffects all supported Windows versions
Exploitability
Unlikely to be exploited — EPSS score 0.2%
Affected products (24)
24 with fix
ProductAffected VersionsFix Status
Remediation & Mitigation
0/3
Schedule — requires maintenance window
0/1Patching may require device reboot — plan for process interruption
HOTFIXApply the October 2026 Windows security update to your Windows 10, Windows 11, and Windows Server systems
Long-term hardening
0/2HARDENINGRestrict local login access to Windows systems to only authorized users who have a business need
HARDENINGReview and revoke unnecessary local user accounts on critical systems
CVEs (1)
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