CVE-2026-83652 in Windows
Summary
by MITRE • 10/14/2026
Heap-based buffer overflow in Windows NTFS allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 10/14/2026
The vulnerability described involves a heap-based buffer overflow within the New Technology File System driver of Microsoft Windows operating systems, specifically affecting components responsible for handling file system operations under the NTFS architecture. This type of flaw arises when the software writes more data to a block of memory allocated on the heap than it is intended to hold, leading to adjacent memory being overwritten with potentially malicious code or data structures. In the context of the Windows kernel and its drivers, such as those managing file system interactions, this corruption can disrupt normal execution flow by overwriting critical function pointers, exception handlers, or other control data located in nearby heap allocations. The presence of this vulnerability indicates a failure in input validation or bounds checking within the NTFS driver code when processing specific file operations or metadata structures provided by an application or user context.
From a technical perspective, heap-based buffer overflows are particularly dangerous because modern operating systems employ various memory protection mechanisms such as Data Execution Prevention and Address Space Layout Randomization to mitigate exploitation. However, skilled attackers can leverage techniques like heap spraying or use-after-free scenarios to gain control over the instruction pointer after triggering the overflow. By carefully crafting malicious input that triggers this buffer overflow condition within the privileged context of the NTFS driver, an attacker can execute arbitrary code with high privileges. This capability is central to local privilege escalation attacks where a low-privileged user account gains administrative or system-level access without authentication credentials for higher tiers.
The operational impact of successfully exploiting this vulnerability is severe, as it allows an authorized but unprivileged attacker to elevate their privileges locally on the affected Windows system. Once elevated, the attacker can bypass security restrictions, install programs, view, change, or delete any files, and create new accounts with full administrative rights. This compromises the integrity, confidentiality, and availability of the entire system environment. In enterprise settings, this could lead to lateral movement across networks if the compromised host is used as a pivot point for further attacks against other systems that trust the elevated credentials obtained through this exploit.
This vulnerability aligns closely with Common Weakness Enumeration identifier CWE-122, which describes heap-based buffer overflow vulnerabilities resulting from improper bounds checking during memory allocation and access operations. Furthermore, in terms of tactical classification within the MITRE ATT&CK framework, exploitation of this flaw falls under Privilege Escalation techniques, specifically those involving local exploits for elevation to higher privilege levels such as SYSTEM or Administrator accounts. The attack vector is classified as Local, requiring physical or logical access to the target machine prior to execution.
Mitigation strategies primarily involve applying vendor-supplied security patches that address the underlying code defects in the NTFS driver components responsible for handling file system requests. Organizations should prioritize patch management processes to ensure timely deployment of these updates across all Windows endpoints. Additionally, implementing strict application whitelisting and least-privilege policies can reduce the risk surface by limiting the ability of untrusted applications or users to trigger complex file system operations that might lead to exploitation. Monitoring for unusual privilege escalation events and anomalous process behavior using endpoint detection and response tools can also aid in identifying potential attempts to exploit this vulnerability before significant damage occurs.