CVE-2026-100216 in Windows
Summary
by MITRE • 10/13/2026
Stack-based buffer overflow in Windows Storage allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 10/14/2026
The vulnerability described constitutes a critical security flaw within the Microsoft Windows Storage subsystem, specifically manifesting as a stack-based buffer overflow. This type of memory corruption error occurs when a program writes more data to a fixed-length block of memory stored on the call stack than it is allocated to hold. In the context of the Windows operating system, such flaws are particularly dangerous because they reside in core components that handle fundamental file and storage operations. The presence of this vulnerability indicates a failure in proper bounds checking during input validation or buffer manipulation routines within the affected subsystem. When an attacker triggers this overflow by supplying crafted data exceeding the allocated stack space, it results in overwriting adjacent memory locations on the stack, including critical control flow data such as return addresses and saved frame pointers.
The operational impact of this vulnerability is severe due to its potential for local privilege escalation. Although exploitation requires initial authorized access to the system, meaning an attacker must already possess valid credentials or have compromised a user account with limited privileges, the ability to exploit this flaw allows that low-privileged entity to execute arbitrary code within the context of higher privileged processes, potentially even achieving SYSTEM-level control over the operating system. This effectively bypasses standard security boundaries and access controls designed to isolate users from critical system resources. Once an attacker gains elevated privileges, they can install programs, view, change, or delete confidential data, create new accounts with full administrative rights, and completely compromise the integrity of the host machine. The ability to escalate privileges locally is a primary vector for lateral movement in enterprise environments, where compromising one endpoint often serves as a stepping stone to attack other systems on the network.
From a technical classification perspective, this vulnerability aligns closely with Common Weakness Enumeration (CWE) identifiers such as CWE-121, which describes stack-based buffer overflow, and potentially CWE-787 if it involves out-of-bounds write access leading to arbitrary code execution. In terms of the MITRE ATT&CK framework, this flaw facilitates techniques associated with Privilege Escalation via Exploitation for Local Elevations, specifically falling under tactics that involve gaining higher-level permissions on a compromised host. Attackers typically leverage such vulnerabilities using exploit kits or custom payloads designed to manipulate the stack layout and redirect execution flow to shellcode injected into the overflowed buffer or adjacent memory regions. The success of exploitation often depends on specific system configurations, including the presence of mitigations like Data Execution Prevention (DEP) and Address Space Layout Randomization (ASLR), although sophisticated attackers may employ techniques such as Return Oriented Programming (ROP) to bypass these protections if they are not fully effective against this particular flaw.
Mitigation strategies for this vulnerability primarily involve applying vendor-supplied security patches that address the underlying code defects responsible for the buffer overflow. Organizations should prioritize deploying updates from Microsoft promptly, especially on systems where local user accounts exist and could be targeted by insider threats or compromised external credentials. In addition to patching, implementing strict application control policies can help prevent unauthorized software execution even if an attacker gains initial access. Network segmentation and monitoring tools that detect anomalous privilege escalation attempts can also provide defense-in-depth capabilities. Regular auditing of account permissions ensures that the principle of least privilege is enforced, thereby reducing the attack surface available for local exploitation. Continuous vulnerability management programs are essential to identify and remediate such high-severity flaws before they can be weaponized by adversaries in real-world scenarios.