CVE-2026-4937
Analyzed Analyzed - Analysis Complete

IBM PowerVM Hypervisor Weak Encryption Key Generation

Publication date: 2026-08-19

Last updated on: 2026-08-25

Assigner: IBM Corporation

Description
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.

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Meta Information

Published
2026-08-19
Last Modified
2026-08-25
Generated
2026-09-09
AI Q&A
2026-08-20
EPSS Evaluated
2026-09-07
NVD
CVE-2026-4937
EUVD
EUVD-2026-62842

Affected Vendors & Products

Showing 32 associated CPEs
Vendor Product Version / Range
ibm power_system_s1122_(9824-22a)_firmware From fw1110.00 (inc) to fw1110.31 (exc)
ibm power_system_s1122_(9824-22a)_firmware fw1120.00
ibm power_system_s1124_(9824-42a)_firmware From fw1110.00 (inc) to fw1110.31 (exc)
ibm power_system_s1124_(9824-42a)_firmware fw1120.00
ibm power_system_s1122s_(9824-22b)_firmware From fw1110.00 (inc) to fw1110.31 (exc)
ibm power_system_s1122s_(9824-22b)_firmware fw1120.00
ibm power_system_s1114_(9824-41b)_firmware From fw1110.00 (inc) to fw1110.31 (exc)
ibm power_system_s1114_(9824-41b)_firmware fw1120.00
ibm power_system_l1122_(9856-22h)_firmware From fw1110.00 (inc) to fw1110.31 (exc)
ibm power_system_l1122_(9856-22h)_firmware fw1120.00
ibm power_system_l1124_(9856-42h)_firmware From fw1110.00 (inc) to fw1110.31 (exc)
ibm power_system_l1124_(9856-42h)_firmware fw1120.00
ibm power_system_e1150_(9043-mru)_firmware From fw1110.00 (inc) to fw1110.31 (exc)
ibm power_system_e1150_(9043-mru)_firmware fw1120.00
ibm power_system_e1080_(9080-hex)_firmware From fw1060.00 (inc) to fw1060.81 (exc)
ibm power_system_s1022_(9105-22a)_firmware From fw1060.00 (inc) to fw1060.81 (exc)
ibm power_system_s1024_(9105-42a)_firmware From fw1060.00 (inc) to fw1060.81 (exc)
ibm power_system_s1022s_(9105-22b)_firmware From fw1060.00 (inc) to fw1060.81 (exc)
ibm power_system_s1014_(9105-41b)_firmware From fw1060.00 (inc) to fw1060.81 (exc)
ibm power_system_l1022_(9786-22h)_firmware From fw1060.00 (inc) to fw1060.81 (exc)
ibm power_system_l1024_(9786-42h)_firmware From fw1060.00 (inc) to fw1060.81 (exc)
ibm power_system_e1050_(9043-mrx)_firmware From fw1060.00 (inc) to fw1060.81 (exc)
ibm power_system_s1012_(9028-21b)_firmware From fw1060.00 (inc) to fw1060.81 (exc)
ibm power_system_e1180_(9080-heu)_firmware From fw1110.00 (inc) to fw1110.31 (exc)
ibm power_system_e1180_(9080-heu)_firmware fw1120.00
ibm power_system_s922_(9009-22g)_firmware From fw950.00 (inc) to fw950.h3 (exc)
ibm power_system_h922_(9223-22s)_firmware From fw950.00 (inc) to fw950.h3 (exc)
ibm power_system_s914_(9009-41g)_firmware From fw950.00 (inc) to fw950.h3 (exc)
ibm power_system_s924_(9009-42g)_firmware From fw950.00 (inc) to fw950.h3 (exc)
ibm power_system_h924_(9223-42s)_firmware From fw950.00 (inc) to fw950.h3 (exc)
ibm power_system_e950_(9040-mr9)_firmware From fw950.00 (inc) to fw950.h3 (exc)
ibm power_system_e980_(9080-m9s)_firmware From fw950.00 (inc) to fw950.h3 (exc)

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Exploitability

CWE
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KEV
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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.

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Executive Summary

This vulnerability affects IBM PowerVM Hypervisor versions FW1110.00 through FW1110.20, FW1060.00 through FW1060.71, and FW950.00 through FW950.H2. A local attacker with admin privileges could exploit it to decrypt encrypted data because certain hypervisor calls use less entropy than requested.

Detection Guidance

This vulnerability is specific to IBM PowerVM Hypervisor and requires local administrative access to exploit. Detection would involve checking the firmware version of the PowerVM Hypervisor. Commands like 'lshw' or 'lsmcode' on Linux systems may help identify the firmware version. Compare the detected version against the vulnerable ranges (FW1110.00 through FW1110.20, FW1060.00 through FW1060.71, FW950.00 through FW950.H2).

Impact Analysis

If exploited, this vulnerability could allow an attacker to decrypt sensitive encrypted data, potentially leading to unauthorized access to confidential information or system resources.

Compliance Impact

This vulnerability could lead to non-compliance with data protection regulations like GDPR or HIPAA by exposing encrypted data, resulting in potential legal and financial penalties.

Mitigation Strategies

Apply the latest firmware updates from IBM for PowerVM Hypervisor to versions FW1110.21 or later, FW1060.72 or later, and FW950.H3 or later to address the entropy issue in hypervisor calls.

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