CVE-2026-8049: SignalRGB Local Privilege Escalation via Improperly Configured Device Object

Technical summary

The vulnerability stems from improper initialization of the \\.\SignalIo device object in SignalRGB's driver interface. Specifically, the device is instantiated without an explicit Security Descriptor Definition Language (SDDL) specification and without the FILE_DEVICE_SECURE_OPEN flag. These omissions result in the Windows kernel applying default access control, which permits any authenticated local user to open a handle to the device and issue privileged I/O control (IOCTL) requests. An attacker with local access can exploit this to bypass the intended access restrictions and execute driver commands at an elevated privilege level.

Business impact

For organizations using SignalRGB in corporate environments—particularly in gaming or creative workstations—this vulnerability creates a local privilege escalation risk. An employee or attacker with local system access could escalate their privileges and potentially compromise system integrity, access sensitive files, or disrupt critical workflows. The impact is limited to local attack scenarios but affects confidentiality, integrity, and availability of affected systems.

Affected systems

SignalRGB versions prior to 1.3.7.0 are affected. The vulnerability requires local authentication; remote exploitation is not possible. Systems running older versions of SignalRGB in multi-user environments or where untrusted users have local access are at highest risk.

Exploitability

Exploitability is straightforward for any authenticated local user. The attack requires no special tools or user interaction beyond standard Windows API calls to open a device handle and send crafted IOCTLs. No public exploit code is known to be widely circulated, but the technical barrier to exploitation is low given the fundamental nature of the misconfiguration. The CVSS score of 5.3 reflects the local-only attack vector and the requirement for prior authentication.

Remediation

Upgrade SignalRGB to version 1.3.7.0 or later. This release corrects the device object initialization to include proper SDDL descriptors and the FILE_DEVICE_SECURE_OPEN flag, restricting handle creation and IOCTL access to authorized users only. No workarounds are available for older versions; patching is the only mitigation.

Patch guidance

Update to SignalRGB version 1.3.7.0 or newer. Verify the update is installed by checking the application's version in Settings or About dialog. After patching, restart the SignalRGB service and any dependent applications. For enterprise deployments, validate patch deployment across all affected endpoints before considering the vulnerability resolved.

Detection guidance

Monitor for SignalRGB installations running versions below 1.3.7.0 using software inventory tools or endpoint detection and response (EDR) platforms. Review process execution logs for unexpected IOCTL operations targeting device objects, or look for unusual driver interaction patterns from non-privileged processes. Network-based detection is limited due to the local-only nature of the vulnerability; focus on endpoint-level visibility.

Why prioritize this

While the CVSS score is MEDIUM (5.3), this vulnerability should be treated as HIGH priority in environments where SignalRGB is deployed on multi-user or shared systems. Local privilege escalation vulnerabilities compound risk when combined with other system compromises and can enable lateral movement or persistent access. Organizations should prioritize patching workstations where RGB control is used, especially if guest accounts or contractor access is permitted.

Risk score, explained

The CVSS 3.1 score of 5.3 (MEDIUM) accounts for the local-only attack vector (AV:L), low complexity (AC:L), requirement for prior user privileges (PR:L), lack of user interaction (UI:N), and impact limited to a single system (S:U). However, the impact on confidentiality, integrity, and availability (C:L/I:L/A:L) is rated low because exploitation grants access to the device driver's functions rather than the entire system. In contexts where SignalRGB runs with elevated privileges or where untrusted users have access, organizations may justify treating this as higher priority than the numeric score alone suggests.

Frequently asked questions