---
id: "CVE-2026-129255"
page: "https://infrastack.ai/live/CVE-2026-129255"
kind: "vulnerability"
aliases: ["CVE-2026-129255"]
title: "CoolerMaster MASTERPLUS+ 1.9.6: driver flaw grants local users elevated access"
severity: "critical"
cvss: 9.3
epss: null
exploited: false
status: "open"
category: "other"
products: [{"name": "CoolerMaster MASTERPLUS+", "fixed": [], "affected": "1.9.6", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["byovd", "coolermaster", "driver", "local-privilege-escalation", "masterplus", "other", "windows"]
not_affected_if: ["no-local-access", "product-not-installed"]
published_at: "2026-11-14T13:17:21+00:00"
first_seen_at: "2026-11-14T13:28:09+00:00"
updated_at: "2026-11-14T13:30:27+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-129255", "first_seen_at": "2026-11-14T13:28:09+00:00"}, {"source": "analyst", "url": "https://vuldb.com/cve/CVE-2026-129255", "first_seen_at": "2026-11-14T13:30:27+00:00", "cites": ["https://vuldb.com/cve/CVE-2026-129255", "https://www.coolermaster.com/en-global/masterplus.html", "https://support.microsoft.com/en-us/windows/security/threat-malware-protection/microsoft-defender-antivirus-alert-vulnerabledriver-winnt-winring0"]}]
exploit_sources: []
---

# CoolerMaster MASTERPLUS+ 1.9.6: driver flaw grants local users elevated access

Link for people: https://infrastack.ai/live/CVE-2026-129255 (this .md is for agents)

A device driver (WinRing0x64.sys) bundled with CoolerMaster MASTERPLUS+ 1.9.6 sets incorrect default permissions when handling a PhysicalAddress argument. A local user can use this to reach hardware-level memory access that should be restricted.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:CoolerMaster MASTERPLUS+ affected 1.9.6 fixed no fixed version listed

## How to check

- Look for WinRing0x64.sys in the MASTERPLUS+ install folder and in loaded drivers (sc query WinRing0_1_2_0, or fltmc/driverquery).
- Check the installed MASTERPLUS+ version is 1.9.6.
- Also check if you run other tools that bundle WinRing0 (Defender flags it as VulnerableDriver:WinNT/Winring0); that is a separate known issue, not confirmed for this CVE.

## Fix

unknown: no fixed version published. The vendor did not respond to disclosure. Uninstall MASTERPLUS+ or remove the driver until Cooler Master ships a fix.

## Timeline

- 2026-11-14T13:28:09+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-129255
- 2026-11-14T13:30:27+00:00 analyst https://vuldb.com/cve/CVE-2026-129255 — No vendor advisory found; VulDB/CNA text says vendor never responded. Cooler Master's MasterPlus page lists 1.9.6 as the current release, with no security note. Privilege gained is not stated; CVSS is local, low privileges, high impact. WinRing0 is a known vulnerable driver family (CVE-2020-14979, Microsoft Defender detection). Nothing verified.

## Documents

- [advisory] VulDB CVE-2026-129255 MASTERPLUS+ https://vuldb.com/cve/CVE-2026-129255
- [mentions] MasterPlus release notes (Cooler Master) https://www.coolermaster.com/en-global/masterplus.html
- [mentions] Microsoft: VulnerableDriver:WinNT/Winring0 https://support.microsoft.com/en-us/windows/security/threat-malware-protection/microsoft-defender-antivirus-alert-vulnerabledriver-winnt-winring0

## From the sources

A vulnerability was identified in CoolerMaster MASTERPLUS+ 1.9.6. This affects the function sub_11504 in the library WinRing0x64.sys of the component Device Driver. The manipulation of the argument PhysicalAddress leads to incorrect default permissions. The attack can only be performed from a local environment. The vendor was contacted early about this disclosure but did not respond in any way.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_