CVE-2026-4937: CWE-331 Insufficient Entropy in IBM PowerVM Hypervisor
Description
CVE-2026-4937 is a medium severity vulnerability in IBM PowerVM Hypervisor versions FW1110.00 through FW1110.20, FW1060.00 through FW1060.71, and FW950.00 through FW950.H2. It involves insufficient entropy in certain hypervisor calls, which could allow a local attacker with administrative privileges to decrypt encrypted data. The vulnerability does not affect confidentiality, integrity, or availability beyond the described impact. No known exploits are reported in the wild, and no patch information is provided.
CVSS v3.1
Score 5.3medium
Affected software
IBM
PowerVM Hypervisor
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
IBM PowerVM Hypervisor versions FW1110.00 through FW1110.20, FW1060.00 through FW1060.71, and FW950.00 through FW950.H2 contain a vulnerability (CWE-331) where certain hypervisor calls use less entropy than requested. This insufficient entropy could allow a local attacker with administrative privileges to decrypt encrypted data. The CVSS v3.1 score is 5.3 (medium), with attack vector local, high attack complexity, high privileges required, no user interaction, and a scope change. Confidentiality impact is high, with no impact on integrity or availability.
Potential Impact
A local attacker with administrative privileges on the affected IBM PowerVM Hypervisor versions could decrypt encrypted data due to insufficient entropy in certain hypervisor calls. This compromises confidentiality but does not affect integrity or availability. There are no known exploits in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict administrative access to trusted personnel only to mitigate risk.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- ibm
- Date Reserved
- 2026-03-26T20:42:14.402Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a86e0f3acd9273b49838514
Added to database: 08/20/2026, 11:11:47 UTC
Last enriched: 09/11/2026, 05:18:01 UTC
Last updated: 10/04/2026, 18:53:16 UTC
Views: 75
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