CVE-2026-69407 in Windows
Summary
by MITRE • 09/09/2026
Integer overflow or wraparound in Volume Manager Driver allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability identified involves a critical integer overflow condition within the Volume Manager Driver, a core component of operating system kernel space responsible for managing storage devices and file systems. This specific flaw arises when the driver fails to properly validate or bound-check arithmetic operations involving memory allocation sizes or buffer lengths derived from user-supplied input. In many modern operating systems, volume management tasks require dynamic calculation of data structures based on disk geometry or partition metadata provided by applications or system utilities. When these calculations involve large values that exceed the maximum limit for a signed integer variable, the result wraps around to a small negative number or a significantly smaller positive value due to two's complement arithmetic behavior. This miscalculation leads the driver to allocate an insufficient amount of memory relative to what is actually required by subsequent operations, creating a classic heap-based buffer overflow scenario within kernel space.
From a technical perspective, this flaw represents a fundamental failure in input validation and boundary checking, categorized under CWE-190: Integer Overflow or Wraparound. The vulnerability allows for the manipulation of internal data structures that control memory access permissions and execution flow. Because the Volume Manager Driver operates with high privileges within the kernel, any exploitation of this integer overflow can lead to arbitrary code execution in ring zero, which is the highest privilege level on most architectures. An attacker who has already gained local access to the system, even through a low-privilege account or a compromised service, can craft specific requests that trigger this overflow during volume mounting, partition resizing, or metadata parsing operations. By carefully controlling the input values, an adversary can overwrite adjacent kernel memory structures, such as function pointers or security tokens, thereby hijacking control flow and executing arbitrary code with system-level privileges.
The operational impact of this vulnerability is severe, primarily due to its potential for local privilege escalation. Once an attacker successfully exploits the integer overflow, they gain full administrative control over the affected system. This compromises the confidentiality, integrity, and availability of all data stored on the device, as well as any network services running under elevated privileges. Furthermore, because kernel-level code execution bypasses most user-space security controls such as Address Space Layout Randomization (ASLR) and Data Execution Prevention (DEP), exploitation is often reliable and does not require complex memory corruption techniques to achieve stable control over the processor state. This aligns with MITRE ATT&CK technique T1068: Exploitation for Privilege Escalation, where adversaries leverage software vulnerabilities to move from a lower-privileged user context to that of an administrator or system account.
Mitigation strategies must focus on both immediate patching and long-term architectural improvements. The primary remediation is the application of vendor-provided security patches that address the specific integer overflow in the Volume Manager Driver, ensuring that all arithmetic operations are validated against maximum bounds before memory allocation occurs. Developers should enforce strict type checking and use safe arithmetic libraries or compiler flags such as -ftrapv to detect overflows at runtime during development phases. Additionally, implementing defense-in-depth measures like Kernel Address Space Layout Randomization (KASLR), Control Flow Integrity (CFI), and mandatory access controls can significantly reduce the likelihood of successful exploitation even if a vulnerability exists. Regular auditing of kernel code for proper input validation and limiting local user privileges to only those necessary for their tasks further minimizes the attack surface available to potential adversaries seeking privilege escalation.