CVE-2026-69504 in Windows
Summary
by MITRE • 09/08/2026
Out-of-bounds read in Windows NTFS allows an authorized attacker to disclose information locally.
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Analysis
by VulDB Data Team • 09/08/2026
The vulnerability identified as an out-of-bounds read within the Windows New Technology File System, commonly referred to as NTFS, represents a critical memory safety flaw that compromises the integrity of system data access mechanisms. This specific defect arises from improper boundary checks during the processing of file system structures or metadata operations performed by the kernel-mode driver responsible for managing disk volumes and directory entries. When an authorized user interacts with specially crafted files or directories, the NTFS filter driver may attempt to read memory locations that lie outside the allocated buffer boundaries. Because this operation occurs in a privileged context, it allows the attacker to extract sensitive information from the kernel's virtual address space without triggering immediate access violations or system crashes, thereby facilitating unauthorized data disclosure at a low level of interaction.
From a technical perspective, out-of-bounds reads are classified under CWE-125, which denotes reading memory beyond the intended buffer boundary. This type of vulnerability is particularly dangerous because it can serve as an information leak vector that aids in subsequent exploitation phases such as address space layout randomization bypasses or kernel pointer disclosure. The flaw likely stems from a logic error where index calculations or length validations are not strictly enforced against the actual size of the data structure being processed by NTFS routines. An attacker who has local access to the system can exploit this condition by triggering specific file operations that cause the driver to dereference invalid pointers, resulting in the leakage of kernel memory contents into user-space accessible buffers.
The operational impact of this vulnerability is primarily centered on confidentiality rather than availability or integrity at first glance. By leveraging an out-of-bounds read, a local attacker can disclose sensitive system information such as kernel module addresses, cryptographic keys stored in memory, or other process-specific data that could aid in further privilege escalation attacks. Although the initial access requires authorization, meaning the attacker must already have valid credentials on the target machine, the ability to leak kernel memory significantly lowers the barrier for achieving full system compromise. This aligns with ATT&CK technique T1083, which covers File and Directory Discovery, as well as techniques related to System Information Discovery where attackers gather environmental data to plan further intrusions. The disclosure of internal structures can also facilitate exploitation of other vulnerabilities by providing necessary memory layout information that would otherwise be obscured by security mitigations like ASLR.
Mitigation strategies for this vulnerability involve both immediate patching and long-term architectural improvements. Microsoft has addressed similar issues in past cumulative updates, so ensuring the operating system is updated with the latest security patches is the primary defense against exploitation of known NTFS flaws. Additionally, organizations should enforce strict least-privilege policies to limit which users can interact with complex file systems or execute scripts that manipulate low-level storage APIs. Enabling Data Execution Prevention and Address Space Layout Randomization provides additional layers of protection by making it more difficult for attackers to utilize leaked memory addresses effectively. Regular auditing of user permissions and monitoring for unusual patterns in file system access logs can also help detect potential exploitation attempts before they lead to significant data breaches or system compromise.