CVE-2026-4936
Received
Received - Intake
IBM PowerVM Hypervisor KeyStore Weak Encryption
Vulnerability report for CVE-2026-4936, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-08-19
Last updated on: 2026-08-19
Assigner: IBM Corporation
Description
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.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| ibm | powervm_hypervisor_platform_keystore | From FW1110.00 (inc) to FW1110.20 (inc) |
| ibm | powervm_hypervisor_platform_keystore | From FW1060.00 (inc) to FW1060.71 (inc) |
| ibm | powervm_hypervisor_platform_keystore | From FW950.00 (inc) to FW950.H2 (inc) |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-331 | The product uses an algorithm or scheme that produces insufficient entropy, leaving patterns or clusters of values that are more likely to occur than others. |
