# CVE-2026-44809: Windows Common Log File System Driver Elevation of Privilege Vulnerability

CVE-2026-44809 is fixed in 8 products on 1 platform, first by KB5094126, released June 9, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-44809
- Priority: High
- CVSS: 7.8 (Important)
- EPSS: 0.0027
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Unlikely
- Published: Jun 9, 2026
- Weakness: Use After Free
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-44809

## Description

<p>Use after free in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Windows 11 Version 24H2 for ARM64-based Systems |  | [KB5094126](https://patchblox.com/security/data/fix/microsoft/kb5094126.md) | Jun 9, 2026 |
| Microsoft | Windows 11 Version 24H2 for x64-based Systems |  | [KB5094126](https://patchblox.com/security/data/fix/microsoft/kb5094126.md) | Jun 9, 2026 |
| Microsoft | Windows 11 Version 25H2 for ARM64-based Systems |  | [KB5094126](https://patchblox.com/security/data/fix/microsoft/kb5094126.md) | Jun 9, 2026 |
| Microsoft | Windows 11 Version 25H2 for x64-based Systems |  | [KB5094126](https://patchblox.com/security/data/fix/microsoft/kb5094126.md) | Jun 9, 2026 |
| Microsoft | Windows 11 Version 26H1 for ARM64-based Systems | 28000.2269 | [KB5095051](https://patchblox.com/security/data/fix/microsoft/kb5095051.md) | Jun 9, 2026 |
| Microsoft | Windows 11 version 26H1 for x64-based Systems | 28000.2269 | [KB5095051](https://patchblox.com/security/data/fix/microsoft/kb5095051.md) | Jun 9, 2026 |
| Microsoft | Windows Server 2025 | 26100.32995 | [KB5094125](https://patchblox.com/security/data/fix/microsoft/kb5094125.md) | Jun 9, 2026 |
| Microsoft | Windows Server 2025 (Server Core installation) | 26100.32995 | [KB5094125](https://patchblox.com/security/data/fix/microsoft/kb5094125.md) | Jun 9, 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

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