CVE-2026-12782: EaseUS Partition Master Privilege Escalation

CVE-2026-12782 Overview

CVE-2026-12782 is an improper access control vulnerability [CWE-266] in the EUEDKEPM.sys kernel driver shipped with EaseUS Partition Master up to version 14.5. The flaw resides in an unspecified function within the driver and allows a local, authenticated attacker to abuse exposed kernel-mode functionality. Exploit code for the issue has been publicly released. The vendor confirmed the issue exists only in older versions and has been resolved in current releases.

Critical Impact
Local attackers with low privileges can leverage the vulnerable kernel driver to compromise confidentiality, integrity, and availability of the affected Windows host.

Affected Products

EaseUS Partition Master versions up to and including 14.5
Component: EUEDKEPM.sys kernel driver
Windows hosts where the vulnerable driver is loaded

Discovery Timeline

2026-06-21 - CVE-2026-12782 published to NVD
2026-06-23 - Last updated in NVD database

Technical Details for CVE-2026-12782

Vulnerability Analysis

The vulnerability resides in the EUEDKEPM.sys kernel driver bundled with EaseUS Partition Master. Improper access controls on a driver routine allow a low-privileged local user to interact with privileged kernel functionality that should be restricted. Because kernel drivers execute in Ring 0, abuse of an exposed driver interface typically results in privilege escalation, arbitrary memory access, or system compromise.

The weakness is categorized as [CWE-266] Incorrect Privilege Assignment. According to the public reference on Winslow1984's CVE collection, the issue is described as a local privilege escalation in the EaseUS Partition Master 14.5 kernel driver. Public exploit material is available, increasing the likelihood of opportunistic use against unpatched endpoints.

Root Cause

The root cause is missing or insufficient access control checks on an IOCTL handler or exported routine within EUEDKEPM.sys. The driver does not adequately validate the caller's privilege level or restrict access to its device object, permitting unprivileged user-mode code to invoke functionality that should be limited to administrators or the kernel.

Attack Vector

Exploitation requires local access and low privileges on the target host. An attacker opens a handle to the driver's device object and issues crafted requests that the driver processes without sufficient authorization checks. The vulnerability is not remotely exploitable and requires no user interaction beyond execution of the attacker's local code. See the VulDB entry for CVE-2026-12782 and the Winslow1984 CVE Collection writeup for additional technical context.

No verified proof-of-concept code is reproduced here. Refer to the linked advisory for technical details of the exploitation primitive.

Detection Methods for CVE-2026-12782

Indicators of Compromise

Presence of EUEDKEPM.sys from EaseUS Partition Master 14.5 or earlier on managed endpoints
Unexpected CreateFile handles opened against the EaseUS driver device object by non-installer processes
New SYSTEM-level processes spawned by user-context applications shortly after interaction with the driver

Detection Strategies

Inventory installed software and driver versions to flag vulnerable EUEDKEPM.sys builds on Windows endpoints
Hunt for low-integrity processes opening handles to the EaseUS driver device path followed by token manipulation or process injection
Correlate driver load events (Windows Event ID 6) with subsequent privilege escalation behavior such as new SYSTEM processes

Monitoring Recommendations

Enable Microsoft Vulnerable Driver Blocklist and audit kernel driver load events on all Windows hosts
Monitor process creation telemetry (Sysmon Event ID 1) for parent-child anomalies involving EaseUS components
Alert on attempts to register or reload EUEDKEPM.sys outside of legitimate installation workflows

How to Mitigate CVE-2026-12782

Immediate Actions Required

Upgrade EaseUS Partition Master to the latest vendor-supplied release where this issue is resolved
Remove or block the vulnerable EUEDKEPM.sys driver on systems that do not require EaseUS Partition Master
Restrict local interactive logon and limit which users can execute untrusted binaries on workstations

Patch Information

The vendor has confirmed the issue exists only in older versions of EaseUS Partition Master and has been remediated in current releases. Download the latest version from the EaseUS Partition Manager product page and replace any installation up to and including 14.5.

Workarounds

Uninstall EaseUS Partition Master on endpoints where it is not actively used
Add the vulnerable driver hash to the Windows Defender Application Control (WDAC) or Microsoft Vulnerable Driver Blocklist policy
Apply least-privilege controls so that standard users cannot load or interact with third-party kernel drivers

bash

# Example: Query and remove the vulnerable driver service on Windows
sc.exe query EUEDKEPM
sc.exe stop EUEDKEPM
sc.exe delete EUEDKEPM