CVE-2026-4937 Power System Insufficient Entropy

Medium 5.3 Published 19 Aug 2026 Updated 20 Aug 2026

Local administrators can decrypt encrypted data due to insufficient entropy in hypervisor calls, requiring a patch.

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-2026-4937?

CVE-2026-4937 is a medium-severity vulnerability in IBM PowerVM Hypervisor, 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 PowerVM Hypervisor FW1110.00 through FW1110.20, FW1060.00 through FW1060.71, and FW950.00 through FW950.H2 could allow a local attacker with administrative privileges to decrypt encrypted data due to certain hypervisor calls utilizing less entropy than requested.

Weakness: CWE-331

Which versions are affected by CVE-2026-4937?

It affects 24 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 E950 \(9040-Mr9\) Firmware, Ibm Power System E980 \(9080-M9s\) Firmware and 18 more.

How do I fix CVE-2026-4937?

No fix has been published for CVE-2026-4937 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-4937 being exploited?

There is no known exploitation of CVE-2026-4937 in the wild and no public exploit code.

Sources

Also known as GHSA-5v8g-ffgq-6fq9.