CVE-2026-77492 in Windows
Summary
by MITRE • 09/08/2026
Out-of-bounds read in Storage Port Driver allows an authorized attacker to disclose information locally.
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability identified as an out-of-bounds read within the Storage Port Driver represents a critical memory safety flaw that compromises system integrity and confidentiality. This specific defect occurs when the driver fails to properly validate array indices or buffer lengths before accessing memory regions associated with storage hardware interfaces. In typical operation, device drivers act as intermediaries between operating systems and physical hardware components such as hard drives, solid-state drives, and NVMe controllers. When a request is processed by the Storage Port Driver, it must ensure that all data pointers remain within allocated boundaries. However, due to insufficient boundary checks, an attacker who has already gained local access can trigger this flaw by sending specially crafted I/O requests or control codes to the storage subsystem. This action causes the driver to read memory locations beyond the intended buffer limits, potentially exposing sensitive kernel-mode data that was not meant for user-space consumption.
From a technical perspective, out-of-bounds reads are classified under CWE-125 in the Common Weakness Enumeration standard, which describes situations where software reads past the end of a memory buffer. This type of vulnerability is particularly dangerous because it can lead to information disclosure without necessarily causing an immediate denial of service or arbitrary code execution, although those risks often follow if the disclosed data reveals internal structures like kernel pointers used for further exploitation steps such as return-oriented programming attacks. The presence of this flaw in a core system component like the Storage Port Driver increases its severity significantly because storage drivers operate at ring 0 level with high privileges and frequent access to critical subsystems. An authorized attacker, defined here as any user account that possesses local login capabilities or can execute code within the operating environment, can exploit this condition repeatedly to gather information about the system state, including cryptographic keys, session tokens, or other protected resources stored in adjacent memory blocks.
The operational impact of this vulnerability extends beyond simple data leakage. By disclosing internal kernel structures and heap layouts, an attacker gains valuable intelligence that facilitates more advanced attacks against the host machine. This aligns with MITRE ATT&CK technique T1082, which covers System Information Discovery, specifically focusing on operating system information gathering through local means. Furthermore, depending on how the leaked data is utilized, it may contribute to privilege escalation vectors described in techniques such as T1068 Exploitation for Privilege Escalation. The ability to read arbitrary kernel memory undermines the isolation guarantees provided by modern operating systems and can lead to complete system compromise if combined with other vulnerabilities or misconfigurations. Organizations relying on these storage subsystems must recognize that even seemingly minor flaws in low-level drivers pose substantial risks to overall security posture, especially in environments where multiple users share access privileges or where sensitive data is processed locally before transmission.
Mitigation strategies for this vulnerability primarily involve applying vendor-provided patches and updates released by the operating system manufacturer. These updates typically include code changes that enforce strict bounds checking on all memory accesses within the Storage Port Driver logic. Administrators should ensure that their systems are configured to automatically receive security updates or manually verify patch levels regularly. In addition to software remediation, defense-in-depth measures such as enabling kernel address space layout randomization can reduce the effectiveness of exploits relying on predictable memory layouts disclosed by this flaw. Furthermore, restricting local administrative privileges and implementing strict access control policies limit the pool of potential attackers who could attempt to trigger this vulnerability in the first place. Monitoring for unusual I/O patterns or excessive storage-related errors may also help detect attempted exploitation activities before significant damage occurs.