CVE-2026-50377 in Windows
Summary
by MITRE • 07/14/2026
Out-of-bounds read in Windows Kernel allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 07/14/2026
This vulnerability represents a critical out-of-bounds read condition within the windows kernel that enables authenticated local attackers to escalate their privileges from standard user level to SYSTEM level access. The flaw occurs when the kernel processes certain data structures or memory operations without proper bounds checking, allowing an attacker with legitimate login credentials to manipulate memory access patterns and potentially execute arbitrary code with elevated privileges. Such vulnerabilities typically arise from insufficient input validation mechanisms within kernel mode components that handle privilege management or system calls.
The technical implementation of this vulnerability involves memory corruption patterns that can be exploited through carefully crafted kernel-level operations or system interactions. When an authenticated user executes specific sequences of system calls or manipulates kernel data structures, the out-of-bounds read allows the attacker to access memory locations beyond allocated buffers or data structures. This memory access violation can potentially reveal sensitive kernel information, manipulate control flow, or corrupt critical system data structures that govern privilege escalation mechanisms.
From an operational perspective, this vulnerability presents a significant risk since it requires only local authentication to exploit, making it particularly dangerous in environments where users have legitimate access to systems but should not possess administrative privileges. The attack vector typically involves leveraging the existing user session to execute malicious code within kernel context, bypassing standard security controls that protect against remote exploitation. The impact extends beyond simple privilege escalation as it can potentially allow attackers to establish persistent backdoors, modify system files, or disable security mechanisms.
The mitigation strategies for this vulnerability include applying Microsoft security patches promptly, implementing strict access controls and user privilege management, monitoring kernel-level activities for suspicious patterns, and maintaining comprehensive system auditing capabilities. Organizations should also consider deploying runtime protection mechanisms such as exploit prevention tools and kernel-mode code integrity checks that can detect and prevent exploitation attempts. The vulnerability aligns with CWE-129 which describes improper validation of array index or buffer bounds, and may map to ATT&CK technique T1068 which covers local privilege escalation through kernel exploits.
This type of vulnerability demonstrates the inherent risks present in kernel-level programming where memory safety issues can have catastrophic consequences for system security. The exploitation typically requires sophisticated knowledge of kernel internals and careful crafting of attack payloads that can leverage existing legitimate system functions to achieve unauthorized access. Security teams must prioritize patch management for such vulnerabilities while implementing robust monitoring systems that can detect anomalous kernel behavior indicative of exploitation attempts.
The presence of this vulnerability in the windows kernel highlights the ongoing challenges in maintaining memory safety within complex operating system components. Kernel-mode exploits like this one represent a significant threat surface since they provide attackers with direct access to system resources and privilege management functions. Organizations should implement comprehensive security measures including regular system updates, privileged access monitoring, and incident response procedures specifically designed to address kernel-level threats that can compromise entire systems through local privilege escalation attacks.