CVE-2026-4937: Power System Insufficient Entropy
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.
Other sources
PowerVM could allow a local attacker with administrative privileges to decrypt encrypted data due to certain hypervisor calls utilizing less entropy than requested.
— IBM
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
IBM PowerVM Hypervisor firmwareto a version that resolves this vulnerability.Fixed in FW1110.30(1110_125), FW1120.00(1120_159), or newer - Upgrade
Upgrade
IBM PowerVM Hypervisor firmwareto a version that resolves this vulnerability.Fixed in FW1110.30(1110_145), FW1120.00(1120_183), or newer - Upgrade
Upgrade
IBM PowerVM Hypervisor firmwareto a version that resolves this vulnerability.Fixed in FW950.H3(950_230) or newer
Event History
Frequently Asked Questions
Who is realistically exposed to this issue?
Systems running the listed IBM PowerVM Hypervisor firmware ranges are exposed if a local attacker already has administrative privileges. The issue is not described as remotely exploitable or reachable by an unauthenticated user.
What does an attacker need to exploit it?
The attacker needs local access and administrative privileges. Exploitation also depends on using the affected hypervisor calls that provide less entropy than requested.
What is the potential impact?
A successful attacker could decrypt encrypted data. The provided impact information indicates confidentiality impact, with no stated integrity or availability impact.