CVE-2026-78454 in Windows
Summary
by MITRE • 09/09/2026
Out-of-bounds read in Windows CD-ROM 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 Microsoft Windows CD-ROM driver represents a critical memory safety flaw that compromises the integrity of system data through unauthorized access mechanisms. This specific defect arises from improper validation of boundary conditions when the operating system processes requests related to optical disc operations. In typical software development, bounds checking is essential to ensure that array indices or buffer offsets remain within allocated memory limits. When this check fails, the driver may attempt to read data from a memory location that lies outside the intended buffer space. This scenario aligns directly with Common Weakness Enumeration category CWE-125, which defines out-of-bounds read vulnerabilities as situations where software reads past the end of an array or buffer, potentially exposing sensitive information stored in adjacent memory regions.
The operational impact of this vulnerability is primarily centered on local information disclosure. Because the flaw resides within a kernel-mode driver, it requires physical access to the machine or valid user credentials to exploit effectively. An authorized attacker who has already gained a foothold on the system can craft specific IOCTL requests that trigger the erroneous memory read operation. By carefully analyzing the contents of the adjacent memory regions accessed during this out-of-bounds read, the attacker may retrieve sensitive data such as kernel pointers, cryptographic keys, or other privileged information residing in nearby memory blocks. This capability significantly aids in further exploitation efforts, particularly for bypassing security mitigations like Kernel Address Space Layout Randomization, which relies on keeping kernel addresses secret to prevent reliable code execution attacks.
From a threat modeling perspective, this vulnerability facilitates lateral movement and privilege escalation scenarios by providing the attacker with critical intelligence about the system's memory layout. According to the MITRE ATT&CK framework, such actions fall under techniques related to Discovery and Defense Evasion, specifically those involving memory scraping or kernel exploitation for reconnaissance purposes. The ability to leak kernel addresses reduces the entropy required for successful exploit development against modern Windows systems that employ robust randomization protections. Consequently, while the initial access may be limited to local information disclosure, the secondary effects can lead to full system compromise if combined with other vulnerabilities or misconfigurations.
Mitigation strategies must focus on both immediate patching and long-term architectural improvements. The primary defense is the application of vendor-provided security updates that correct the boundary validation logic within the CD-ROM driver code. Organizations should prioritize deploying these patches across all endpoints to eliminate the attack surface immediately. Additionally, implementing strict access controls for physical ports can prevent unauthorized individuals from connecting malicious optical media or devices that might trigger the vulnerable code paths. For environments where patching is not instantly feasible, network segmentation and endpoint detection and response solutions configured to monitor for unusual IOCTL patterns related to storage drivers can provide an additional layer of defense against exploitation attempts.