CVE-2026-57851 in MSI Feature Manager
Summary
by MITRE • 07/07/2026
MSI Feature Manager contains a local privilege escalation vulnerability in the KernCoreLib64.sys kernel driver that allows any locally logged-on user to perform arbitrary physical memory read/write and unrestricted I/O port operations by accessing exposed IOCTL handlers without administrator privileges. Attackers can exploit the accessible device object through IOCTL handlers to manipulate kernel objects, tamper with kernel-mode callbacks, bypass Protected Process Light protections, and disable security software.
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Analysis
by VulDB Data Team • 07/07/2026
This vulnerability resides within the MSI Feature Manager component and specifically targets the KernCoreLib64.sys kernel driver which operates at the highest privilege level in the Windows operating system. The flaw represents a critical local privilege escalation vector that fundamentally undermines the security model of modern operating systems by allowing unprivileged users to execute code with kernel-level privileges. The vulnerability manifests through exposed IOCTL (Input/Output Control) handlers that provide direct access to kernel memory operations and hardware I/O port manipulations without proper authentication or authorization checks.
The technical implementation of this flaw involves improper access control mechanisms within the kernel driver's device object handling routines. When a locally logged-on user interacts with the vulnerable device interface, the system fails to validate the caller's privileges before executing sensitive operations. This design flaw enables attackers to perform arbitrary physical memory read/write operations that can modify critical kernel data structures and system variables. The vulnerability directly maps to CWE-284 Access Control Issues, specifically targeting improper access control at the kernel level where privilege escalation occurs through unchecked device access.
The operational impact of this vulnerability extends far beyond simple privilege elevation. Attackers can manipulate kernel objects in real-time, potentially corrupting system integrity and establishing persistent backdoors within the operating system. The ability to bypass Protected Process Light protections demonstrates the severity of the flaw, as this mechanism is specifically designed to prevent unauthorized access to protected processes. Security software running in kernel mode becomes vulnerable to disabling or manipulation, effectively neutralizing endpoint protection mechanisms that rely on kernel-level monitoring and control.
The exploitation chain typically begins with a local user session accessing the vulnerable device object through standard Windows API calls. Once accessed, attackers can leverage the exposed IOCTL handlers to perform sophisticated manipulations including hooking system call tables, modifying security descriptors, and disabling critical security features. This capability aligns with ATT&CK technique T1068, Privilege Escalation through kernel vulnerabilities, and T1562.001, Disable or Modify Tools, as the vulnerability enables attackers to compromise the integrity of system security measures. The persistence potential is significant as kernel-level modifications can survive reboots and remain undetected by standard endpoint protection solutions.
Mitigation strategies must address both immediate remediation and long-term defensive measures. Microsoft has issued patches that correct the access control issues within the KernCoreLib64.sys driver, requiring system administrators to apply these updates promptly across all affected systems. Organizations should implement the principle of least privilege for kernel drivers and regularly audit device object permissions to prevent unauthorized access. Additionally, monitoring for suspicious kernel-mode activity and implementing kernel integrity checking mechanisms can help detect exploitation attempts before they succeed. The vulnerability underscores the importance of proper driver security reviews and adherence to secure coding practices that prevent unauthorized access to privileged system resources.