CVE-2026-16832 in Power Systems
Summary
by MITRE • 08/19/2026
IBM Power Systems Firmware FW1120.00, FW1110.00 through FW1110.30, FW1060.00 through FW1060.80, and FW950.00 through FW950.H2 is affected by a vulnerability in the FSP management network protocol. An attacker with authenticated HMC administrator access can execute arbitrary code on the service processor, giving full control over the managed system, resulting in a confidentiality, integrity, and availability impact.
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Analysis
by VulDB Data Team • 08/19/2026
The identified vulnerability resides within the firmware of IBM Power Systems, specifically affecting versions FW1120.00, FW1110.00 through FW1110.30, FW1060.00 through FW1060.80, and FW950.00 through FW950.H2. This security flaw is located in the management network protocol utilized by the Flexible Service Processor, commonly referred to as the FSP or service processor. The FSP serves as a critical out-of-band management component that operates independently of the main operating system on IBM Power Systems servers. It handles hardware monitoring, remote console access, firmware updates, and power control functions. By compromising this subsystem, an attacker gains direct influence over the underlying physical infrastructure rather than just a specific software instance running on it.
The technical nature of this vulnerability allows for arbitrary code execution within the service processor environment. This capability is particularly severe because the FSP typically runs with high-level privileges necessary to interact directly with hardware components and manage system state. The exploitation vector requires an attacker to possess authenticated administrator access via the Hardware Management Console, which is the primary interface used by system administrators to manage IBM Power Systems environments. While this requirement limits the attack surface compared to unauthenticated remote exploits, it represents a significant risk in scenarios where administrative credentials are compromised through phishing, credential stuffing, or lateral movement from other breached systems within the network.
Once an attacker successfully executes arbitrary code on the service processor, they achieve full control over the managed system. This level of access bypasses traditional operating system security controls and virtualization layers that might otherwise contain a breach. The impact encompasses all three pillars of the CIA triad: confidentiality, integrity, and availability. Regarding confidentiality, the compromised FSP can potentially intercept or exfiltrate sensitive data processed by the server, including encryption keys stored in hardware security modules if present. For integrity, an attacker could modify firmware images, alter boot sequences to load malicious kernels, or tamper with system logs to cover their tracks without detection by standard OS-level auditing tools. In terms of availability, the attacker can force hard reboots, shut down systems permanently, or disrupt network connectivity managed by the FSP, leading to significant operational downtime for critical business applications hosted on these servers.
From a classification perspective, this vulnerability aligns with CWE-78 Improper Neutralization of Special Elements used in an OS Command and CWE-94 Improper Control of Generation of Code. The ability to execute arbitrary code indicates a failure in input validation or command injection prevention within the management protocol implementation. In terms of adversary tactics, this scenario maps directly to MITRE ATT&CK technique T1505 Server Software Component: Web Shell or similar server-side components used for persistence and lateral movement. It also relates to T1498 Network Denial of Service via resource exhaustion if the attacker chooses to disrupt availability. The exploitation path leverages valid administrative credentials, which corresponds to Initial Access techniques involving Valid Accounts, specifically those with elevated privileges that allow interaction with management interfaces.
Mitigation strategies must focus on both immediate remediation and long-term architectural hardening. The primary defense is applying the latest firmware updates provided by IBM for all affected Power Systems models. Organizations should verify their current FSP firmware versions against the list of vulnerable releases to ensure patches are deployed promptly. Beyond patching, access control mechanisms for the Hardware Management Console must be rigorously audited. This includes enforcing multi-factor authentication for HMC administrators, restricting network access to the management interface through firewalls or VLAN segmentation so that only authorized jump hosts can reach it, and implementing strict role-based access controls to limit who holds administrator privileges. Regular monitoring of FSP logs for anomalous activity is also recommended to detect potential exploitation attempts early.