CVE-2026-69895 in Windows
Summary
by MITRE • 09/09/2026
Out-of-bounds read in Windows Spaceport.sys allows an authorized attacker to disclose information locally.
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability identified within the Windows Spaceport.sys driver represents a critical memory safety failure classified as an out-of-bounds read, which corresponds directly to CWE-125 in the Common Weakness Enumeration standard. This specific flaw occurs when the kernel-mode driver fails to properly validate array indices or buffer boundaries before accessing memory locations that lie outside the intended allocation space. In the context of Windows operating systems, Spaceport.sys is a component responsible for managing storage-related operations and hardware abstraction layers. When an attacker triggers this condition by supplying crafted input parameters during system calls related to storage device management, the driver reads data from adjacent memory regions without performing necessary bounds checks. This behavior violates fundamental principles of secure coding where all external inputs must be rigorously validated against expected limits before being used for memory access operations.
From a technical perspective, out-of-bounds read vulnerabilities are particularly dangerous because they allow an attacker to leak sensitive kernel-mode information that is not intended for user-space consumption. The data exposed can include pointers to other kernel structures, cryptographic keys, session tokens, or internal state variables of the operating system. This leakage provides the foundation for further exploitation stages where the disclosed memory contents can be analyzed to bypass security mitigations such as Kernel Address Space Layout Randomization (KASLR). By obtaining valid kernel addresses, an attacker gains a significant advantage in constructing reliable exploit chains that target other vulnerabilities or escalate privileges from a standard user account to SYSTEM level. The presence of this flaw indicates a deficiency in the driver's input validation logic, specifically regarding how it handles requests for storage device information or configuration queries sent through IOCTL interfaces.
The operational impact of this vulnerability is severe due to its potential to facilitate local privilege escalation and information disclosure attacks. An authorized attacker with low-privilege access can exploit this flaw by repeatedly triggering the out-of-bounds read condition to gather sufficient kernel memory data. This aligns with ATT&CK technique T1082, which involves system information discovery, as well as T1059, command and script interpretation if combined with other exploits for code execution. The ability to disclose arbitrary kernel memory contents undermines the integrity of the operating system's security model by revealing secrets that protect against reverse engineering and exploitation attempts. Furthermore, in multi-tenant environments or virtualized contexts where Windows hosts are used as servers, this vulnerability could potentially lead to cross-tenant data leakage if the exposed memory contains information relevant to other isolated processes or containers managed by the host OS.
Mitigation strategies for this vulnerability primarily involve applying the official security updates provided by Microsoft that patch the Spaceport.sys driver with proper bounds checking logic. Administrators should ensure that all systems are updated to the latest cumulative patches which address these specific kernel-mode flaws. In addition to patching, defense-in-depth measures such as enabling Kernel DMA Protection and ensuring that Virtualization-Based Security is active can help mitigate the impact of memory corruption vulnerabilities by restricting direct hardware access and isolating critical system processes. For organizations unable to immediately apply patches, monitoring for unusual IOCTL calls related to storage devices or anomalous kernel memory accesses via advanced endpoint detection and response tools may provide early warning indicators of exploitation attempts. It is also recommended to restrict physical access to systems running vulnerable versions of Windows as local attackers require direct interaction with the operating system's interfaces to trigger this flaw effectively.