---
id: CVE-2026-85804
title: >-
  Use after free in Windows Win32 Kernel Subsystem allows an authorized attacker
  to elevate privileges locally.
summary: >-
  Use after free in Windows Win32 Kernel Subsystem allows an authorized attacker
  to elevate privileges locally.
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-416
vendor: microsoft
product: windows_11_23h2
affected:
  - windows_11_23h2 < 10.0.22631.7652
  - windows_11_24h2 < 10.0.26100.9711
  - windows_11_25h2 < 10.0.26200.9711
  - windows_11_26h1 < 10.0.28000.3231
  - windows_11_26h2 < 10.0.26300.9711
  - windows_server_2025 < 10.0.26100.33650
patched:
  - windows_11_23h2 10.0.22631.7652
  - windows_11_24h2 10.0.26100.9711
  - windows_11_25h2 10.0.26200.9711
  - windows_11_26h1 10.0.28000.3231
  - windows_11_26h2 10.0.26300.9711
  - windows_server_2025 10.0.26100.33650
published: '2026-10-13'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T17:43:59.553'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-85804'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85804'
    label: secure@microsoft.com
tags:
  - nvd
  - cve.org
epss: 0.00337
epssPercentile: 0.2699
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-13T20:10:41.622482Z'
ingestedAt: '2026-10-13T19:43:29.169Z'
---

## Overview

Use after free in Windows Win32 Kernel Subsystem allows an authorized attacker to elevate privileges locally.

## Affected

- `windows_11_23h2 < 10.0.22631.7652`
- `windows_11_24h2 < 10.0.26100.9711`
- `windows_11_25h2 < 10.0.26200.9711`
- `windows_11_26h1 < 10.0.28000.3231`
- `windows_11_26h2 < 10.0.26300.9711`
- `windows_server_2025 < 10.0.26100.33650`

## Remediation

Upgrade past the affected range:

- `windows_11_23h2 10.0.22631.7652`
- `windows_11_24h2 10.0.26100.9711`
- `windows_11_25h2 10.0.26200.9711`
- `windows_11_26h1 10.0.28000.3231`
- `windows_11_26h2 10.0.26300.9711`
- `windows_server_2025 10.0.26100.33650`