CVE-2026-4932 IBM CVE debrief

Who should care

IBM PowerVM Hypervisor administrators and users with physical access to the TME hardware, as well as security teams and vulnerability management teams responsible for IBM PowerVM Hypervisor deployments. These individuals should be aware of the vulnerability and take steps to mitigate it, such as patching affected systems and implementing compensating controls.

Technical summary

IBM PowerVM Hypervisor FW1110.00 through FW1110.20, and FW1060.00 through FW1060.71, could allow an attacker with physical access to the Transparent Memory Encryption (TME) hardware to decrypt encrypted memory due to insufficient cryptographic entropy. This vulnerability affects the IBM PowerVM Hypervisor, which is used in various IBM systems. The vulnerability has a CVSS score of 4.2 and a severity of MEDIUM. The CVE record was published on 2026-07-28T19:17:36.287Z and has not been modified since then.

Defensive priority

Medium priority due to physical access requirement

Recommended defensive actions

• Inventory affected systems and prioritize patching
• Implement compensating controls such as monitoring and exception tracking
• Verify vendor remediation and apply patches
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE description and NVD detail page provide information on the vulnerability. IBM has provided a vendor advisory. The vulnerability affects IBM PowerVM Hypervisor FW1110.00 through FW1110.20, and FW1060.00 through FW1060.71. An attacker with physical access to the Transparent Memory Encryption (TME) hardware could decrypt encrypted memory due to insufficient cryptographic entropy. Defenders should verify the affected systems, review vendor remediation, and apply patches. Evidence is limited to public sources and may not reflect the full scope or impact of the vulnerability.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.