CVE-2026-82807: Ultra RAMDisk Pro Privilege Escalation Flaw

CVE-2026-82807 is a privilege escalation vulnerability in ieungSoft Ultra RAMDisk Pro 1.82 affecting the URDSCSI.sys kernel driver. Attackers with local access can exploit improper privilege management to gain elevated system rights. This article covers technical details, affected versions, impact assessment, and mitigation strategies.

CVE-2026-82807 Overview

CVE-2026-82807 is a local privilege escalation vulnerability in ieungSoft Ultra RAMDisk Pro version 1.82. The flaw resides in the URDSCSI.sys kernel driver and stems from improper privilege management [CWE-266]. A local attacker with low privileges can abuse the driver to write arbitrary registry values, resulting in escalation to SYSTEM-level access. The exploit has been publicly disclosed, and the vendor did not respond to disclosure attempts.

Critical Impact
Successful exploitation grants local low-privileged users full kernel-level control over affected Windows hosts through the vulnerable URDSCSI.sys driver, compromising confidentiality, integrity, and availability.

Affected Products

ieungSoft Ultra RAMDisk Pro 1.82
Component: Kernel Driver URDSCSI.sys
Windows systems where the vulnerable driver is loaded

Discovery Timeline

2026-08-31 - CVE-2026-82807 published to NVD
2026-09-01 - Last updated in NVD database

Technical Details for CVE-2026-82807

Vulnerability Analysis

The vulnerability exists in the URDSCSI.sys kernel driver shipped with Ultra RAMDisk Pro 1.82. The driver exposes functionality to user mode without enforcing adequate privilege checks. This allows a local, authenticated user to invoke a kernel routine that performs arbitrary registry value writes.

Because registry writes execute in kernel context, an attacker can modify security-sensitive registry keys that are otherwise restricted to SYSTEM. Common targets include service configuration entries, image file execution options, and driver load paths. Writing to these keys enables execution of attacker-controlled code with elevated privileges on the next relevant trigger.

The classification maps to [CWE-266] Incorrect Privilege Assignment. Exploitation requires local access with low privileges and no user interaction.

Root Cause

The driver fails to validate the security context of the caller before performing privileged registry operations. The IOCTL handler in URDSCSI.sys accepts caller-supplied registry paths and values, then executes the write in kernel mode without ACL enforcement or restriction of allowed keys.

Attack Vector

An attacker with a local user session opens a handle to the driver device object and issues a crafted IOCTL. The request includes a target registry path and value under the attacker's control. The driver performs the write in kernel mode, bypassing normal Windows access controls. The attacker then triggers execution of the modified registry-referenced binary or service to obtain SYSTEM privileges.

See the Winslow CVE Collection writeup and the VulDB entry for CVE-2026-82807 for additional technical details.

Detection Methods for CVE-2026-82807

Indicators of Compromise

Presence of URDSCSI.sys (Ultra RAMDisk Pro 1.82) loaded on endpoints without a documented business need.
Unexpected registry modifications to sensitive keys such as HKLM\SYSTEM\CurrentControlSet\Services\* or HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options.
Non-administrative processes opening a handle to the URDSCSI device object followed by DeviceIoControl calls.

Detection Strategies

Inventory hosts for the vulnerable driver by hash and file path, and flag any occurrence of URDSCSI.sys from Ultra RAMDisk Pro 1.82.
Alert on registry writes to service, driver, or IFEO keys originating from low-privileged user sessions.
Correlate driver load events (Windows Event ID 6, Sysmon Event ID 6) with subsequent registry tampering by the same session.

Monitoring Recommendations

Enable Sysmon rules for registry key creation and modification events (Event IDs 12, 13, 14) targeting sensitive hives.
Monitor process creation for sc.exe, reg.exe, and unsigned binaries spawned by SYSTEM immediately after a low-privilege user interacts with the driver.
Baseline expected users of Ultra RAMDisk Pro and investigate deviations.

How to Mitigate CVE-2026-82807

Immediate Actions Required

Uninstall Ultra RAMDisk Pro 1.82 from all endpoints where it is not operationally required.
Block the vulnerable URDSCSI.sys driver using the Microsoft Vulnerable Driver Blocklist and Windows Defender Application Control (WDAC).
Restrict local logon rights on hosts where the driver must remain installed to reduce the population of potential attackers.

Patch Information

No vendor patch is available. The VulDB advisory notes the vendor was contacted early but did not respond. Organizations should treat Ultra RAMDisk Pro 1.82 as unsupported for security purposes and plan removal or replacement.

Workarounds

Enable Microsoft's Vulnerable Driver Blocklist policy on Windows 10, Windows 11, and Windows Server to prevent URDSCSI.sys from loading.
Apply WDAC or AppLocker policies to deny driver load based on file hash or publisher.
Remove the driver service entry and delete URDSCSI.sys from %SystemRoot%\System32\drivers\ on affected systems that no longer need the software.
Audit and tighten permissions on registry keys that control service and driver execution to limit post-exploitation impact.

bash

# Example: disable and remove the vulnerable driver service on Windows
sc.exe stop URDSCSI
sc.exe delete URDSCSI
del /f /q %SystemRoot%\System32\drivers\URDSCSI.sys