Vulnerability · Published Aug 19, 2026 · Assigned by ibm
CVE-2026-4936Power System Insufficient Entropy
Medium 5.1
In plain English
A medium-severity security flaw in PowerVM Hypervisor from IBM. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 1% of all known vulnerabilities).
Severity (CVSS 3.1)5.1Medium
Exploit odds (30 days)0.1%top 98.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
IBM PowerVM Hypervisor Platform KeyStore (PKS) and virtual TPM FW1110.00 through FW1110.20, FW1060.00 through FW1060.71, and FW950.00 through FW950.H2 use persistent storage key seeds that result in an AES key with reduced strength. An attacker with access to the service processor or HMC could exploit this weakness to derive the encryption key and access the data.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| IBM | PowerVM Hypervisor | FW1110.00 – through FW1110.20FW1060.00 – through FW1060.71FW950.00 – through FW950.H2 |
Weakness: CWE-331 · Vector: CVSS:3.1/AV:A/AC:H/PR:H/UI:R/S:C/C:H/I:N/A:N
References
- https://www.ibm.com/support/pages/node/7283890 vendor-advisory, patch