CVE-2026-19234 Power System Buffer Overflow

High 8.2 Published 19 Aug 2026 Updated 21 Aug 2026

An attacker with service processor access can execute arbitrary code on the host system via a malicious firmware update image.

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-2026-19234?

CVE-2026-19234 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

Power Systems Firmware FW1120.00, FW1110.00 through FW1110.30, and FW1060.00 through FW1060.80 is affected by a vulnerability in the host firmware boot process image validation path. An attacker with service access to the service processor can supply a maliciously crafted code update image, allowing arbitrary code to be executed on the host system. Successful exploitation could result in a confidentiality, integrity, and availability impact to the affected host system.

Weakness: CWE-121

Which versions are affected by CVE-2026-19234?

It affects 19 products.

Products include Ibm Power System E1050 \(9043-Mrx\) Firmware, Ibm Power System E1080 \(9080-Hex\) Firmware, Ibm Power System E1150 \(9043-Mru\) Firmware, Ibm Power System E1180 \(9080-Heu\) Firmware, Ibm Power System L1022 \(9786-22h\) Firmware, Ibm Power System L1024 \(9786-42h\) Firmware and 13 more.

How do I fix CVE-2026-19234?

No fix has been published for CVE-2026-19234 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-2026-19234 being exploited?

There is no known exploitation of CVE-2026-19234 in the wild and no public exploit code.

Sources

Also known as GHSA-gxcw-mv6h-cx89.