CVE-2026-24183 in Cumulus Linux
Summary
by MITRE • 08/18/2026
NVIDIA Cumulus Linux contains a vulnerability in the user management component, where an unprivileged user could use improper privilege management on the system. A successful exploit of this vulnerability might lead to escalation of privileges.
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Analysis
by VulDB Data Team • 08/18/2026
The identified security flaw resides within the user management subsystem of NVIDIA Cumulus Linux, specifically targeting mechanisms designed to enforce access control and privilege boundaries. This vulnerability stems from a failure in proper privilege management logic, which allows an unprivileged local user to bypass intended restrictions on system resources or configuration settings. In enterprise networking environments where Cumulus Linux serves as the operating system for network switches and routers, such components are critical for maintaining the integrity of administrative controls. The core technical issue involves insufficient validation checks during operations that modify user permissions or group memberships, enabling a lower-privilege entity to manipulate these structures in ways not authorized by standard policy definitions.
From an operational perspective, this weakness facilitates privilege escalation, allowing attackers to transition from a low-level unprivileged account to one with elevated rights, potentially including root or administrator privileges. Once such access is achieved, the attacker gains the ability to modify system configurations, install malicious software, exfiltrate sensitive network data, or pivot further into connected infrastructure. This represents a significant risk in environments where physical or logical access might be partially compromised by insiders or through initial footholds obtained via other vectors like phishing or unpatched services on adjacent systems. The impact extends beyond individual host compromise to potential disruption of broader network operations and loss of confidentiality for data traversing the managed devices.
This vulnerability aligns with Common Weakness Enumeration (CWE) categories related to improper privilege management, particularly CWE-269 which addresses Improper Privilege Management where a user is able to perform actions that exceed their assigned permissions. It also correlates with MITRE ATT&CK techniques focusing on local privilege escalation methods used by adversaries after gaining initial access to a system. The exploitation path typically involves leveraging specific commands or API calls within the Cumulus Linux environment that interact directly with identity and access management services without adequate verification of the caller's current authority level relative to the requested action.
Mitigation strategies should prioritize applying vendor-provided patches as soon as they become available, ensuring that all instances of NVIDIA Cumulus Linux are updated to versions where this logic error has been corrected. In addition to patching, organizations must enforce strict least-privilege principles across their network infrastructure, limiting which users have access to user management tools and configuration interfaces. Regular auditing of system logs for anomalous privilege changes or unauthorized attempts to modify group memberships can aid in early detection of exploitation attempts. Furthermore, implementing robust monitoring solutions that detect lateral movement patterns associated with post-exploitation activities will help contain potential breaches before they result in significant damage to the network architecture.