# CVE-2026-70243: Windows Kernel Elevation of Privilege Vulnerability

CVE-2026-70243 is fixed in 4 products on 1 platform, first by KB5126653, released October 13, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-70243
- Priority: High
- CVSS: 7.0 (Important)
- EPSS: 0.0030
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Less Likely
- Published: Oct 13, 2026
- Weakness: Use After Free
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70243

## Description

<p>Use after free in Windows Kernel allows an authorized attacker to elevate privileges locally.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Windows 11 Version 23H2 for ARM64-based Systems | 22631.7652 | [KB5126653](https://patchblox.com/security/data/fix/microsoft/kb5126653.md) | Oct 13, 2026 |
| Microsoft | Windows 11 Version 23H2 for x64-based Systems | 22631.7652 | [KB5126653](https://patchblox.com/security/data/fix/microsoft/kb5126653.md) | Oct 13, 2026 |
| Microsoft | Windows Server 2025 | 26100.33650 | [KB5126646](https://patchblox.com/security/data/fix/microsoft/kb5126646.md) | Oct 13, 2026 |
| Microsoft | Windows Server 2025 (Server Core installation) | 26100.33650 | [KB5126646](https://patchblox.com/security/data/fix/microsoft/kb5126646.md) | Oct 13, 2026 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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