CVE-2026-102205 in Windows
Summary
by MITRE • 10/13/2026
Heap-based buffer overflow in Windows Universal Disk Format File System Driver (UDFS) allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 10/13/2026
The vulnerability identified involves a heap-based buffer overflow within the Windows Universal Disk Format File System Driver, commonly referred to as UDFS.sys. This component is responsible for managing file system operations on media formatted with the Universal Disk Format, which is frequently used for optical discs such as DVDs and Blu-ray disks, as well as certain types of removable storage devices. The core technical flaw stems from improper validation of input data lengths before copying them into a pre-allocated heap buffer. When an application or user interacts with a UDFS-formatted volume in a manner that triggers this specific code path without adequate bounds checking, the driver writes more data than the allocated memory space can accommodate. This overflow overwrites adjacent memory structures on the heap, potentially corrupting critical control data such as function pointers or object headers.
From an operational perspective, this vulnerability poses a severe risk to system integrity because it allows for local privilege escalation. An attacker who has already gained authenticated access to the target machine can craft malicious input that exploits this buffer overflow condition. By carefully controlling the heap layout and the content of the overwritten memory, the attacker can execute arbitrary code within the context of the operating system kernel or a high-privilege process. This effectively bypasses standard user-level security controls, granting the attacker full administrative rights over the compromised system. The ability to escalate privileges in this manner undermines the fundamental isolation between user applications and the core operating system, allowing for complete compromise of confidentiality, integrity, and availability.
This vulnerability aligns with Common Weakness Enumeration (CWE) category CWE-120, which describes buffer copy without checking size limits, specifically manifesting as a heap-based overflow under CWE-787. In terms of the MITRE ATT&CK framework, this exploit technique falls under Privilege Escalation via Taint Analysis or Heap Spraying techniques often associated with kernel exploitation strategies like T1068 Exploitation for Privilege Escalation. The attack vector is classified as Local (T1059), requiring physical or logical access to the machine prior to exploitation, which limits its remote exploitability but increases the severity of impact once initial access is established through other means such as phishing or network service vulnerabilities.
Mitigation strategies primarily involve applying vendor-supplied security patches that address the input validation logic within the UDFS driver. System administrators should ensure that all Windows systems are updated with the latest cumulative updates provided by Microsoft, which typically include fixes for kernel-mode drivers and file system components. Additionally, reducing the attack surface can be achieved by disabling unnecessary services or removing support for optical drives if they are not required in the specific operational environment. Implementing strict application control policies using tools like Windows Defender Application Control (WDAC) can also help prevent unauthorized code execution that might attempt to leverage this vulnerability, although patching remains the most effective and immediate remediation step.