CVE-2026-16832 Power System Buffer Overflow

High 8.4 Published 19 Aug 2026 Updated 22 Aug 2026

An authenticated HMC administrator can execute arbitrary code on the service processor via a buffer overflow, gaining full control of the managed system.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-16832?

CVE-2026-16832 is a high-severity memory corruption vulnerability in IBM Power Systems Firmware, published on 19 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

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.

Weakness: CWE-121

Which versions are affected by CVE-2026-16832?

It affects 9 products.

Products include Ibm Power System E1080 \(9080-Hex\) Firmware, Ibm Power System E1180 \(9080-Heu\) Firmware, Ibm Power System E950 \(9040-Mr9\) Firmware, Ibm Power System E980 \(9080-M9s\) Firmware, Ibm Power System H922 \(9223-22s\) Firmware, Ibm Power System H924 \(9223-42s\) Firmware and 3 more.

How do I fix CVE-2026-16832?

No fix has been published for CVE-2026-16832 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-16832 being exploited?

There is no known exploitation of CVE-2026-16832 in the wild and no public exploit code.

Sources

Also known as GHSA-m373-q23q-fx37.