CVE-2026-78516 in Windows
Summary
by MITRE • 09/09/2026
Buffer over-read in Windows Storage allows an unauthorized attacker to disclose information with a physical attack.
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability identified as CVE-2024-38067 represents a critical security flaw within the Microsoft Windows storage subsystem, specifically involving a buffer over-read condition that can be exploited through direct hardware access. This type of vulnerability arises when software reads data beyond the boundaries of an allocated memory buffer without proper validation or bounds checking. In the context of the Windows Storage stack, this typically occurs during low-level operations where raw disk sectors are accessed directly by system drivers or kernel-mode components to manage file systems, volume management, or storage device communication protocols. The flaw allows for the disclosure of sensitive information stored in adjacent memory locations that were not intended to be exposed to the calling process or driver context.
From a technical perspective, buffer over-reads differ from buffer overflows in that they do not typically allow for arbitrary code execution by writing malicious data into memory. Instead, their primary impact is informational leakage. When an attacker triggers this vulnerability via physical access to the machine, such as through direct hardware interaction with storage controllers or using specialized debugging interfaces like JTAG or SWD on embedded components within modern SSDs and NVMe drives, they can force the system to read uninitialized or sensitive kernel memory. This memory may contain cryptographic keys, session tokens, password hashes, or other high-value secrets that are currently in use by the operating system but not properly isolated from lower-level storage operations under certain conditions.
The operational impact of this vulnerability is significant for environments where physical security cannot be guaranteed. An attacker with physical access to a vulnerable Windows machine can exploit this flaw to extract sensitive data directly from memory dumps or through real-time interception during storage I/O operations. This capability undermines the confidentiality guarantees provided by encryption at rest, as it allows attackers to bypass file-level protections and retrieve plaintext secrets before they are encrypted on disk or after they have been decrypted for use. The attack vector is classified under physical access scenarios, which places it outside the scope of remote network-based exploitation but makes it a severe threat in corporate environments with shared workstations, unsecured data centers, or devices that leave ports accessible when powered off or in sleep states.
This vulnerability aligns closely with CWE-125, Out-of-bounds Read, as it involves accessing memory locations beyond the intended buffer limits. Furthermore, from an offensive security framework perspective, such exploitation techniques fall under MITRE ATT&CK technique T1003, specifically Credential Dumping via OS Credential Dumping methods that leverage direct hardware or low-level API access to extract secrets like LSASS memory contents or kernel pool data. The ability to read arbitrary physical memory addresses through storage subsystem flaws highlights the complexity of isolating trust boundaries between user-mode applications and kernel-mode drivers in modern operating systems.
Mitigation strategies for this vulnerability primarily involve applying the security updates provided by Microsoft, which patch the underlying code paths responsible for the improper bounds checking within the Windows Storage stack. Organizations should ensure that all endpoints are updated to the latest cumulative patches released after March 2024. Beyond software remediation, physical security controls remain essential. Implementing strict access controls to server rooms and workstations, disabling unused hardware interfaces such as USB ports or debug headers when not in active use, and utilizing full disk encryption solutions that integrate with TPMs can help mitigate the risk of data exfiltration even if an attacker gains brief physical access. Additionally, enabling Secure Boot and other firmware-level protections helps ensure that only signed and trusted code runs during the boot process, reducing the attack surface for low-level exploits targeting storage drivers.