CVE-2026-16898 in IBM
Summary
by MITRE • 08/13/2026
IBM i 7.6, 7.5, 7.4, and 7.3 could allow a local authenticated attacker to change the ownership of arbitrary files due to improper validation of an attacker-controlled file path.
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Analysis
by VulDB Data Team • 08/13/2026
This vulnerability exists in IBM i operating systems versions 7.6, 7.5, 7.4, and 7.3 where a local authenticated attacker with sufficient privileges can manipulate file ownership through improper validation of attacker-controlled file paths. The flaw stems from inadequate input sanitization mechanisms that fail to properly validate or sanitize file path references provided by authenticated users. This weakness allows an attacker to craft malicious file path inputs that bypass normal access controls and ownership validation checks, potentially enabling privilege escalation or unauthorized data manipulation.
The technical implementation of this vulnerability involves the operating system's file management subsystem failing to adequately verify the legitimacy of file paths during ownership change operations. When an authenticated user submits a file path for ownership modification, the system should validate that the path points to a legitimate file within expected directories and that the user has proper authorization to modify that file's ownership. However, the validation process is insufficient, allowing crafted paths to traverse unexpected directory structures or reference files outside of intended boundaries.
From an operational impact perspective, this vulnerability creates significant security risks for organizations running affected IBM i systems. An authenticated attacker could potentially escalate privileges by changing ownership of critical system files, configuration files, or user data files to gain unauthorized access or modify system behavior. The vulnerability particularly affects environments where multiple users share the same system and where proper privilege separation is essential for maintaining security boundaries.
The flaw aligns with CWE-73, which describes "External Control of File Name or Path" - a weakness where an application uses external input to construct file paths without proper validation or sanitization. This classification indicates that the vulnerability originates from insufficient input validation practices during file system operations. Additionally, this weakness can enable techniques described in the ATT&CK framework under T1068, "Exploitation for Privilege Escalation," where attackers leverage system vulnerabilities to gain higher privileges.
Organizations should implement immediate mitigations including applying the latest IBM security patches and hotfixes released for these specific operating system versions. System administrators should also review and tighten file access controls, implement proper input validation mechanisms for all file operations, and consider restricting unnecessary file ownership modification capabilities for non-privileged users. Network segmentation and monitoring of file system operations can help detect potential exploitation attempts. Regular security assessments and privilege reviews should be conducted to minimize the attack surface and ensure proper access control enforcement throughout the IBM i environment.