Windows Kernel Elevation of Privilege Vulnerability

Plan PatchCVSS 7CVE-2026-83924Oct 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 use-after-free vulnerability in the Windows kernel allows a local user to escalate privileges. The flaw is present in Windows 10, Windows 11, Windows Server 2016 through 2025, and all supported versions across 32-bit, x64, and ARM64 architectures. Microsoft has issued patches as part of the October 2026 security update, with exploitation assessed as unlikely.

What this means
What could happen
A user with local access to a Windows system could exploit a kernel memory flaw to gain administrative privileges, potentially allowing them to modify control logic, access sensitive process data, or disable safety systems on any connected OT devices.
Who's at risk
Organizations running Windows as engineering workstations, HMI servers, or data historians in water utilities, electric distribution, or manufacturing environments. Particularly affects sites where Windows systems have network connectivity to PLCs, RTUs, or other control devices, or where engineering staff use Windows machines to configure and monitor OT systems.
How it could be exploited
An attacker with a local user account on a Windows machine running vulnerable kernel code could trigger a use-after-free condition to write arbitrary data to kernel memory. Once privileges are escalated to SYSTEM level, the attacker could access engineering software, HMI systems, or network access credentials that grant control over PLCs and field devices.
Prerequisites
  • Local user account on Windows machine
  • Vulnerable kernel version running
  • No administrative privileges required to initiate exploit
local access required but no special complexityaffects all supported Windows versionsimpacts privilege escalation pathway to OT systemsvendor patches available for all versions
Exploitability
Unlikely to be exploited — EPSS score 0.3%
Affected products (28)
28 with fix
ProductAffected VersionsFix Status
Windows 11 Version 26H2 for ARM64-based SystemsAll versionsBuild 10.0.26300.9711
Windows 11 Version 26H2 for x64-based SystemsAll versionsBuild 10.0.26300.9711
Windows 10 Version 1809 for 32-bit SystemsAll versionsBuild 10.0.17763.9376
Windows 10 Version 1809 for x64-based SystemsAll versionsBuild 10.0.17763.9376
Windows Server 2019All versionsBuild 10.0.17763.9376
Remediation & Mitigation
0/4
Schedule — requires maintenance window
0/2

Patching may require device reboot — plan for process interruption

Windows Server 2019
HOTFIXPrioritize patching Windows Server 2019, 2022, and 2025 systems that host engineering workstations, HMI servers, or historian databases
All products
HOTFIXApply the October 2026 Windows security update to all Windows 10, Windows 11, and Windows Server systems
Long-term hardening
0/2
HARDENINGRestrict local user account creation and login access on Windows systems with direct or network access to OT devices
HARDENINGImplement Windows security baselines and disable unnecessary local services on engineering and SCADA workstations
API: /api/v1/advisories/1b4363c5-c8e3-4f5d-9e30-f6d99401dfc3

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