CVE-2026-61930 in Windows
Summary
by MITRE • 08/11/2026
Heap-based buffer overflow in Windows Kernel allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 08/12/2026
This vulnerability represents a critical heap-based buffer overflow within the windows kernel that enables local privilege escalation for authenticated attackers. The flaw occurs when the kernel fails to properly validate input data during heap allocation operations, allowing malicious code to overwrite adjacent memory regions in the kernel's heap space. Such vulnerabilities typically arise from insufficient bounds checking in kernel-mode drivers or system components that handle user-supplied data. The technical implementation involves improper memory management where allocated heap chunks do not adequately account for buffer boundaries, creating opportunities for attackers to craft specially crafted input that overflows into adjacent memory locations.
The operational impact of this vulnerability is severe as it allows a local attacker with standard user privileges to escalate their access level to kernel-level privileges. This elevation enables the attacker to bypass system security controls, access protected memory regions, manipulate system processes, and potentially achieve complete system compromise. The attack vector requires local system access and authentication, making it particularly dangerous in environments where user accounts may be compromised through social engineering or other means. The vulnerability's exploitation typically involves crafting malicious input that triggers the buffer overflow during kernel processing, followed by careful manipulation of the heap layout to achieve code execution at kernel level.
From a cybersecurity perspective, this vulnerability aligns with common weakness enumeration cwe-121 which describes heap-based buffer overflows occurring when insufficient bounds checking allows data to be written beyond allocated memory regions. The attack pattern follows established techniques documented in the attack tree framework under privilege escalation categories where attackers leverage memory corruption vulnerabilities to gain elevated system privileges. Mitigation strategies include implementing kernel address space layout randomization kalsr, enabling exploit protection mechanisms such as control flow guard and dynamic code integrity checks, and applying timely security updates from microsoft. Additionally, organizations should implement least privilege principles, monitor for unusual process behavior, and maintain comprehensive endpoint detection and response capabilities to identify potential exploitation attempts. Regular security assessments of kernel-mode components and driver code review processes are essential for identifying similar vulnerabilities before they can be exploited by adversaries. The vulnerability demonstrates the critical importance of robust memory management practices in kernel development and highlights the need for continuous security hardening efforts across operating system components.