CVE-2026-16933 Power System Integer Overflow

High 8.2 Published 19 Aug 2026 Updated 22 Aug 2026

Attackers with BMC access can exploit an integer overflow to read and write arbitrary host memory, gaining full control over the 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-2026-16933?

CVE-2026-16933 is a high-severity 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, FW950.00 through FW950.H2, OP940.00 through OP940.a1 (Power9), and OP940.00 through OP940.81 (Power HMC) is affected by a vulnerability in the interface between the BMC/FSP and the host system. An attacker with service account or root access to the BMC/FSP can read and write arbitrary regions of host system memory, giving full control over the host system and all hosted partitions, resulting in a confidentiality, integrity, and availability impact.

Weakness: CWE-190

Which versions are affected by CVE-2026-16933?

It affects 29 products.

Products include Ibm Power Hardware Management Console \(7063-Cr2\) Firmware, Ibm Power System Ac922 \(8335-Gth\) Firmware, Ibm Power System Ac922 \(8335-Gtx\) Firmware, Ibm Power System E1050 \(9043-Mrx\) Firmware, Ibm Power System E1080 \(9080-Hex\) Firmware, Ibm Power System E1150 \(9043-Mru\) Firmware and 23 more.

How do I fix CVE-2026-16933?

No fix has been published for CVE-2026-16933 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-16933 being exploited?

There is no known exploitation of CVE-2026-16933 in the wild and no public exploit code.

Sources

Also known as GHSA-vhm3-9qxc-9hqg.