CVE-2026-76736 in Instant On
Summary
by MITRE • 09/29/2026
A buffer overflow vulnerability exists in the underlying operating system of HPE Networking Instant On. Successful exploitation could allow a low-privilege authenticated local attacker to interrupt the normal operation of the affected service.
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Analysis
by VulDB Data Team • 09/29/2026
The identified security flaw resides within the core operating system components of HPE Networking Instant On, specifically manifesting as a buffer overflow condition. This type of vulnerability typically arises when an application writes more data to a fixed-length block of memory than it is allocated to hold, causing adjacent memory locations to be overwritten with unintended values. In this specific instance, the flaw allows for the disruption of normal service operations rather than direct code execution or privilege escalation at this stage. The presence of such a defect indicates insufficient bounds checking during input processing within the underlying OS layer, which serves as the foundation for the networking management platform's functionality.
Exploitation of this vulnerability requires specific conditions to be met by an attacker. A low-privilege authenticated local user must have access to the affected system and interact with the vulnerable service component. Once authentication is established, the attacker can craft a specially designed input that exceeds the expected buffer size. Upon processing this oversized payload, the operating system's memory management fails to contain the overflow, leading to corruption of critical data structures or control flow mechanisms within the targeted process. This corruption results in an abnormal termination of the service, effectively causing a denial of service condition for any users relying on that specific function of the HPE Networking Instant On platform.
The operational impact of this vulnerability is primarily centered around availability and reliability rather than confidentiality or integrity at the immediate level. By interrupting normal operation, the attacker can degrade the performance of network management tasks, potentially preventing administrators from monitoring, configuring, or troubleshooting connected devices. In a production environment where continuous uptime is critical for network stability, such interruptions can lead to significant operational downtime, increased support costs due to manual intervention required to restart services, and potential cascading failures if dependent systems rely on uninterrupted access to the Instant On management interface. While the current description highlights service interruption, buffer overflows are historically precursors to more severe exploits, including arbitrary code execution, making this a critical risk that warrants immediate attention despite its currently limited exploitation scope.
From a classification perspective, this vulnerability aligns with Common Weakness Enumeration identifier CWE-120, which describes Buffer Copy without Checking Size of Input Classic Overflow. This categorization highlights the fundamental programming error where input validation is neglected during memory allocation and copy operations. Furthermore, in terms of tactical behavior within the MITRE ATT&CK framework, this scenario relates to techniques that impact availability, such as T1499 Endpoint Denial of Service or potentially T1053 Scheduled Task/Job if the overflow triggers a crash that requires manual recovery actions disrupting operational workflows. Understanding these mappings helps in aligning remediation efforts with broader security governance standards and incident response playbooks designed to mitigate service disruption risks.
To mitigate this risk, HPE has likely released a firmware or software update that patches the underlying operating system component by implementing proper input validation and bounds checking mechanisms. Administrators should prioritize applying the latest available updates for their specific version of HPE Networking Instant On as soon as they are verified in staging environments to ensure compatibility with existing network configurations. In addition to patching, organizations can implement defense-in-depth strategies such as restricting local access to management interfaces through strict firewall rules and role-based access control policies. Monitoring logs for unusual service restarts or error messages related to memory allocation failures can also aid in early detection of exploitation attempts before significant operational impact occurs. Regular vulnerability scanning focused on the underlying OS components rather than just the application layer is recommended to identify similar latent defects across the infrastructure.