CVE-2026-8050: SignalRGB Denial of Service Vulnerability

CVE-2026-8050 Overview

CVE-2026-8050 is a NULL pointer dereference vulnerability in SignalRGB versions prior to 1.3.7.0. The flaw resides in the application's kernel driver, where seven of the thirteen IOCTL (I/O Control) handlers dereference the SystemBuffer pointer without first verifying that it is non-NULL. An attacker who sends an IOCTL request with an empty input buffer triggers a NULL pointer dereference in kernel context, producing a system crash. The result is a local denial-of-service condition affecting any system running a vulnerable SignalRGB installation.

Critical Impact
A local user can crash the Windows kernel by issuing a single IOCTL with an empty input buffer to the SignalRGB driver, producing a bug check and forced reboot.

Affected Products

SignalRGB versions prior to 1.3.7.0
SignalRGB kernel-mode driver IOCTL interface
Windows hosts running vulnerable SignalRGB installations

Discovery Timeline

2026-06-17 - CVE-2026-8050 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2026-8050

Vulnerability Analysis

The SignalRGB kernel driver exposes thirteen IOCTL handlers to user-mode callers. Seven of those handlers read from the Irp->AssociatedIrp.SystemBuffer pointer without validating that the buffer was actually supplied. When a caller issues DeviceIoControl with a zero-length input buffer, the I/O manager passes a NULL SystemBuffer to the driver. The handler then dereferences NULL while running at kernel IRQL, producing an access violation that the kernel cannot recover from. This triggers a KMODE_EXCEPTION_NOT_HANDLED or similar bug check.

Root Cause

The root cause is missing input validation in the driver's dispatch routine [CWE-476]. The handlers proceed directly to field access on SystemBuffer without a guard check for NULL or for the InputBufferLength reported in the IRP stack location. Proper IOCTL handlers must validate both the pointer and the declared buffer size before any read or write.

Attack Vector

Exploitation requires only local access to the device object exposed by the driver. Any process that can open a handle to the SignalRGB driver can call DeviceIoControl with one of the seven vulnerable control codes and a NULL or zero-length input buffer. No elevated privileges are required if the device DACL permits standard user access. The outcome is a kernel crash and forced reboot, denying service to all users of the affected host.

No verified public exploit code is available. The vulnerability mechanism is documented in the CERT Vulnerability Advisory.

Detection Methods for CVE-2026-8050

Indicators of Compromise

Unexpected Windows bug checks referencing the SignalRGB driver in the faulting module field of crash dumps in C:\Windows\Minidump.
Event ID 1001 (BugCheck) entries in the System event log correlated with active SignalRGB processes.
Unusual DeviceIoControl activity from non-SignalRGB processes targeting the SignalRGB device object.

Detection Strategies

Inspect minidumps and MEMORY.DMP for faulting modules attributable to SignalRGB and stack frames in IOCTL dispatch routines.
Correlate kernel crash events with the installed SignalRGB version to identify hosts running builds prior to 1.3.7.0.
Hunt for processes opening handles to the SignalRGB device and issuing DeviceIoControl with empty input buffers.

Monitoring Recommendations

Enable Windows Error Reporting and forward crash telemetry to a central log store for correlation.
Inventory endpoints for SignalRGB installations and flag versions below 1.3.7.0.
Alert on repeated bug checks on the same host within short intervals, which may indicate active exploitation attempts.

How to Mitigate CVE-2026-8050

Immediate Actions Required

Upgrade all SignalRGB installations to version 1.3.7.0 or later.
Identify endpoints running vulnerable versions through software inventory tools and prioritize patching on shared or multi-user systems.
Restrict installation of SignalRGB to systems where the RGB control functionality is required.

Patch Information

The vendor addresses CVE-2026-8050 in SignalRGB version 1.3.7.0. The fix adds NULL and length validation to the affected IOCTL handlers before dereferencing SystemBuffer. Review the CERT Vulnerability Advisory for vendor coordination details and updated build availability.

Workarounds

Uninstall SignalRGB on hosts where it is not required for business operations.
Stop and disable the SignalRGB kernel driver service until the host can be upgraded to 1.3.7.0.
Apply application allowlisting to prevent untrusted processes from opening handles to the SignalRGB device object.

bash

# Stop and disable the SignalRGB driver service on Windows
sc.exe stop SignalRgbPlatformService
sc.exe config SignalRgbPlatformService start= disabled

# Verify installed version
powershell -Command "Get-ItemProperty 'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\*' | Where-Object DisplayName -like 'SignalRGB*' | Select-Object DisplayName, DisplayVersion"