CVE-2026-70017 in Windows
Summary
by MITRE • 10/14/2026
Access of resource using incompatible type ('type confusion') in Windows Secure Kernel Mode allows an authorized attacker to disclose information locally.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 10/15/2026
The vulnerability described involves a critical flaw within the Windows Secure Kernel Mode, specifically categorized as a type confusion error. This class of defect arises when software incorrectly assumes that a data structure or variable is of one specific type while it actually contains another, leading to improper handling during execution. In the context of kernel-mode operations, such errors are particularly severe because they occur at the highest privilege level on an operating system, where direct access to hardware and core memory structures is permitted without standard security checks that apply in user mode. The Secure Kernel Mode serves as a foundational component responsible for enforcing critical security policies and managing protected resources; therefore, any inconsistency in how data types are interpreted within this layer can compromise the integrity of the entire system's trust boundary.
From a technical perspective, type confusion vulnerabilities typically stem from insufficient validation of input parameters or incorrect casting operations during runtime. When an authorized attacker triggers this flaw, they may cause the kernel to interpret memory contents as a different structure than intended. This misinterpretation allows for out-of-bounds reads or writes, which can lead to unauthorized disclosure of sensitive information stored in adjacent memory locations. Since the vulnerability resides in secure kernel mode, it bypasses many conventional user-space protections and isolation mechanisms that would otherwise prevent such access. The attacker does not need elevated privileges beyond what is required to interact with the affected component, yet they gain the ability to read protected memory regions that should remain inaccessible under normal operational conditions.
The operational impact of this vulnerability centers on local information disclosure. An authenticated user who exploits this flaw can extract confidential data from the kernel's address space, potentially including cryptographic keys, session tokens, or other sensitive system state information. This exposure undermines the confidentiality guarantees provided by Windows' security architecture and may facilitate further attacks if the disclosed information is used to bypass additional authentication layers or decrypt protected communications. Although the initial access requires authorization, the ability to read arbitrary kernel memory significantly expands the attack surface for privilege escalation or persistent compromise scenarios where leaked secrets are leveraged in subsequent stages of an intrusion campaign.
In terms of industry standards and threat modeling, this vulnerability aligns with CWE-843, which defines Access of Resource Using Incompatible Type, commonly known as type confusion. It also relates to CWE-120, Buffer Copy without Checking Size of Input, if the misinterpretation leads to buffer overflows during processing. From an offensive security perspective, such flaws are often exploited using techniques documented in MITRE ATT&CK framework under Data from Local System or potentially Taint and Sandbox Detection Evasion if used to hide malicious activities by manipulating kernel structures. The exploitation path typically involves crafting specific inputs that trigger the type mismatch condition within the secure kernel's processing logic, allowing the attacker to control how data is interpreted and accessed in memory.
Mitigation strategies for this vulnerability primarily involve applying vendor-provided security patches that correct the underlying code errors responsible for the type confusion. Developers must implement rigorous input validation and ensure strict typing checks before casting or interpreting user-supplied data within kernel-mode drivers or core system components. Static analysis tools and fuzzing techniques should be employed during development to detect potential mismatches in variable types early in the software lifecycle. Additionally, enabling hardware-enforced stack protection features such as Kernel Address Space Layout Randomization (KASLR) can reduce the likelihood of successful exploitation by making it more difficult for attackers to predict memory layouts required to leverage type confusion effectively. Organizations should prioritize patching systems running affected versions of Windows and monitor for indicators of compromise that suggest attempts to exploit kernel-level information disclosure vulnerabilities.