# CVE-2018-0743: Windows Subsystem for Linux Elevation of Privilege Vulnerability

CVE-2018-0743 is fixed in 5 products on 1 platform, first by KB4056891, released January 3, 2018. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2018-0743
- Priority: High
- CVSS: 7.0 (Important)
- EPSS: 0.0287
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Less Likely
- Published: Jan 5, 2018
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2018-0743

## Description

<p>An elevation of privilege vulnerability exists due to an integer overflow in Windows Subsystem for Linux. An attacker who successfully exploited the vulnerability could execute code with elevated permissions.</p> <p>To exploit the vulnerability, a locally authenticated attacker could run a specially crafted application.</p> <p>The security update addresses the vulnerability by correcting how Windows Subsystem for Linux handles objects in memory.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Windows 10 Version 1703 for 32-bit Systems | 15063.850 | [KB4056891](https://patchblox.com/security/data/fix/microsoft/kb4056891.md) | Jan 3, 2018 |
| Microsoft | Windows 10 Version 1703 for x64-based Systems | 15063.850 | [KB4056891](https://patchblox.com/security/data/fix/microsoft/kb4056891.md) | Jan 3, 2018 |
| Microsoft | Windows 10 Version 1709 for 32-bit Systems | 16299.192 | [KB4056892](https://patchblox.com/security/data/fix/microsoft/kb4056892.md) | Jan 3, 2018 |
| Microsoft | Windows 10 Version 1709 for x64-based Systems | 16299.192 | [KB4056892](https://patchblox.com/security/data/fix/microsoft/kb4056892.md) | Jan 3, 2018 |
| Microsoft | Windows Server, version 1709  (Server Core Installation) | 16299.192 | [KB4056892](https://patchblox.com/security/data/fix/microsoft/kb4056892.md) | Jan 3, 2018 |

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Data as of 2026-11-07T12:40:37Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo