CVE-2026-12778 AOMEI Partition Assistant Kernel Driver Privilege Escalation

Technical summary

CVE-2026-12778 involves improper access control mechanisms in the ampa10.sys kernel driver component of AOMEI Partition Assistant. The vulnerability stems from inadequate privilege checks (CWE-266) and insufficient access control enforcement (CWE-284) within the driver's interface. An unprivileged local user can leverage this flaw to escalate privileges without user interaction, achieving read, write, and execute capabilities at the system level. The CVSS 3.1 vector (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) reflects the local-only attack surface, low complexity exploitation, and high impact across confidentiality, integrity, and availability.

Business impact

Organizations relying on AOMEI Partition Assistant for disk management face significant risk. A compromised system could enable attackers to manipulate partitions, destroy data, install persistent malware, or pivot to other network resources. The lack of vendor responsiveness means no coordinated patches may be forthcoming, leaving affected deployments vulnerable indefinitely unless mitigation strategies are deployed. This is particularly concerning in environments where the tool is used administratively across multiple systems.

Affected systems

AOMEI Partition Assistant version 10.10.1 and all prior versions are affected. The vulnerability is triggered through the ampa10.sys kernel driver, which is installed as part of the standard application package. Any Windows system running a vulnerable version with local user access is at risk. Organizations should identify all machines with Partition Assistant deployed and verify their current version against 10.10.1.

Exploitability

Exploitation requires local system access and valid user credentials—a low barrier for internal threats, contractors, or compromised low-privilege accounts. The attack is trivial to execute (low complexity) once an attacker has initial foothold, and does not require social engineering. Public disclosure and possible exploit availability mean this vulnerability is likely to be targeted opportunistically. The lack of authentication bypass makes lateral movement necessary but elevates the risk for any local user session.

Remediation

Immediate action should focus on inventory and containment. Users should verify whether their version exceeds 10.10.1 by checking application version information. If a vendor patch becomes available, prioritize deployment in test environments first. Until a fix is released, consider restricting the application to trusted administrative accounts only, limiting local user privileges on systems running Partition Assistant, or temporarily removing the application from non-critical systems. Monitor vendor communications for any future guidance or patches.

Patch guidance

Check the AOMEI website and your product license portal for available updates beyond version 10.10.1. As of the vulnerability publication date, verify against the vendor advisory whether a patch has been released. If no patch is available and the application is business-critical, evaluate alternative disk management tools or implement compensating controls such as driver signature enforcement and application whitelisting. Document your patching decision and review quarterly for vendor updates.

Detection guidance

Monitor for suspicious kernel driver activity, privilege escalation attempts involving ampa10.sys, and unexpected system modifications initiated by unprivileged user processes. Endpoint detection and response (EDR) tools should flag attempts to communicate with or load the vulnerable driver with elevated intentions. Process monitoring may reveal abuse through disk partition manipulation utilities. Check for any suspicious use of Windows APIs related to privilege escalation in conjunction with Partition Assistant execution.

Why prioritize this

This vulnerability merits immediate prioritization due to its HIGH CVSS score (7.8), public exploit disclosure, and the vendor's non-responsiveness to early disclosure. The local privilege escalation vector impacts confidentiality, integrity, and availability equally, and the straightforward attack complexity means it can be exploited quickly once an attacker gains initial local access. In mixed-privilege environments, this becomes a rapid escalation path to system compromise.

Risk score, explained

The CVSS 3.1 score of 7.8 (HIGH) reflects: (1) local-only attack vector, limiting exposure to systems where users already have access; (2) low attack complexity, requiring no special conditions; (3) low privilege requirement, exploitable by standard users; (4) no user interaction needed; (5) high impact across all three security pillars (confidentiality, integrity, availability). The score would be critical if the attack vector were network-based, but remains high due to the complete system compromise potential within local attack scope.

Frequently asked questions