CVE-2026-96318 in Windows
Summary
by MITRE • 10/14/2026
Heap-based buffer overflow in Windows Resume 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 Windows Resume functionality of Microsoft operating systems. This specific flaw resides in how the system handles data during the resume process from sleep or hibernation states, where insufficient bounds checking allows for writing beyond the allocated memory boundaries on the heap. Such memory corruption issues are critical because they can lead to arbitrary code execution if an attacker can control the content written past the buffer limit and manipulate adjacent memory structures to redirect program flow.
From a technical perspective, this flaw is categorized under CWE-122, which denotes Heap-based Buffer Overflow. The mechanism typically involves copying user-controlled or system-generated data into a fixed-size heap allocation without verifying that the input size fits within the allocated space. When the resume operation triggers specific code paths in the operating system kernel or critical subsystems, an oversized payload can overwrite adjacent memory metadata or function pointers. This corruption enables the attacker to gain control over execution flow, potentially leading to privilege escalation from a standard user context to SYSTEM-level privileges.
The operational impact of this vulnerability is severe due to its potential for local privilege escalation. An authorized attacker who has valid credentials on the target system can exploit this flaw during or after the resume process to execute arbitrary code with elevated permissions. This effectively bypasses security boundaries established by Windows User Account Control and other access control mechanisms, allowing full compromise of the affected machine. The attack vector is classified as Local in terms of initial access requirements but results in a significant increase in impact scope due to the resulting high-level privileges.
In alignment with industry frameworks, this vulnerability maps to MITRE ATT&CK technique T1068 Exploitation for Privilege Escalation. Attackers would likely leverage this flaw during the post-exploitation phase after gaining initial foothold through other means or via local access. The exploitation requires physical proximity or prior unauthorized access to execute code, making it less suitable for remote attacks but highly dangerous in environments where insider threats or compromised workstations are a concern.
Mitigation strategies primarily involve applying the latest security updates provided by Microsoft that address this specific heap overflow condition within the resume handling routines. Administrators should ensure all systems are patched with the relevant cumulative update containing fixes for CVE identifiers associated with this issue. Additionally, implementing strict application whitelisting and monitoring for unusual process creation events following system wake cycles can help detect exploitation attempts in real-time. Restricting local administrative privileges to only those users who absolutely require them also reduces the attack surface by limiting the number of accounts capable of triggering such privilege escalation vectors.