CVE-2026-83834

Analyzed Analyzed - Analysis Complete

Use-After-Free in Windows Kernel-Mode Drivers Allows Privilege Escalation

Publication date: 2026-10-13

Last updated on: 2026-10-27

Assigner: Microsoft Corporation

Description

Use after free in Windows Kernel-Mode Drivers allows an authorized attacker to elevate privileges locally.

CVSS Scores

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Meta Information

Published

2026-10-13

Last Modified

2026-10-27

Generated

2026-11-08

AI Q&A

2026-10-14

EPSS Evaluated

2026-11-07

NVD

CVE-2026-83834

EUVD

EUVD-2026-99377

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_server_2022	to 10.0.20348.5761 (exc)
microsoft	windows_10_1607	to 10.0.14393.9612 (exc)
microsoft	windows_10_1607	to 10.0.14393.9612 (exc)
microsoft	windows_10_1809	to 10.0.17763.9376 (exc)
microsoft	windows_10_1809	to 10.0.17763.9376 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7807 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7807 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7807 (exc)
microsoft	windows_11_23h2	to 10.0.22631.7652 (exc)
microsoft	windows_11_23h2	to 10.0.22631.7652 (exc)
microsoft	windows_11_24h2	to 10.0.26100.9711 (exc)
microsoft	windows_11_24h2	to 10.0.26100.9711 (exc)
microsoft	windows_11_25h2	to 10.0.26200.9711 (exc)
microsoft	windows_11_25h2	to 10.0.26200.9711 (exc)
microsoft	windows_11_26h1	to 10.0.28000.3231 (exc)
microsoft	windows_11_26h1	to 10.0.28000.3231 (exc)
microsoft	windows_11_26h2	to 10.0.26300.9711 (exc)
microsoft	windows_11_26h2	to 10.0.26300.9711 (exc)
microsoft	windows_server_2016	to 10.0.14393.9612 (exc)
microsoft	windows_server_2019	to 10.0.17763.9376 (exc)
microsoft	windows_server_2025	to 10.0.26100.33650 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7807 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7807 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7807 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-416	The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
CWE-367	The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check.

Attack-Flow Graph

Executive Summary

This is a use-after-free vulnerability in Windows Kernel-Mode Drivers. It allows an authorized attacker with local access to elevate their privileges on the system by exploiting a memory management flaw.

Detection Guidance

Detection typically requires monitoring for unusual kernel-mode driver behavior or privilege escalation attempts. Use Windows Event Viewer to check for Event ID 4672 (Special Privileges Assigned) or Event ID 4688 (Process Execution) for suspicious activity. Microsoft Defender for Endpoint can also detect anomalous kernel driver interactions.

Impact Analysis

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

Compliance Impact

This vulnerability allows local privilege escalation in Windows systems, which could enable unauthorized access to sensitive data or system functions. Such access may violate compliance requirements under GDPR (data protection) and HIPAA (health information security) by exposing personal or protected health information.

Mitigation Strategies

Apply the latest Windows security updates immediately through Windows Update or WSUS. Disable unnecessary kernel-mode drivers if not required. Enable exploit protection features in Windows Defender. Monitor for unauthorized privilege escalation attempts.

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