CVE-2026-4937 - Vulnerability Details - OpenCVE

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.

No CVSS v4.0

Attack Vector Local

Attack Complexity High

Privileges Required High

Scope Changed

Confidentiality Impact High

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Key SSVC decision points have not yet been added.

Vendors	Products
Ibm	Power Systems Firmware Powervm Hypervisor

No data.

No data.

References

Link	Providers
https://www.ibm.com/support/pages/node/7283900

History

Wed, 19 Aug 2026 22:15:00 +0000

Type	Values Removed	Values Added
First Time appeared		Ibm powervm Hypervisor
Vendors & Products		Ibm powervm Hypervisor

Wed, 19 Aug 2026 20:30:00 +0000

Type	Values Removed	Values Added
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.
Title		Power System Insufficient Entropy
First Time appeared		Ibm Ibm power Systems Firmware
Weaknesses		CWE-331
CPEs		cpe:2.3:o:ibm:power_systems_firmware:fw1060.00:::::::* cpe:2.3:o:ibm:power_systems_firmware:fw1060.71:::::::* cpe:2.3:o:ibm:power_systems_firmware:fw1110.00:::::::* cpe:2.3:o:ibm:power_systems_firmware:fw1110.20:::::::* cpe:2.3:o:ibm:power_systems_firmware:fw950.00:::::::* cpe:2.3:o:ibm:power_systems_firmware:fw950.h2:::::::*
Vendors & Products		Ibm Ibm power Systems Firmware
References		https://www.ibm.com/support/pages/node/7283900
Metrics		cvssV3_1 `{'score': 5.3, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:N/A:N'}`

MITRE

Status: PUBLISHED

Assigner: ibm

Published: 2026-08-19T20:11:01.810Z

Updated: 2026-08-20T15:20:20.047Z

Reserved: 2026-03-26T20:42:14.402Z

Link: CVE-2026-4937

Vulnrichment

No data.

NVD

Status : Awaiting Analysis

Published: 2026-08-19T21:16:55.570

Modified: 2026-08-20T16:17:24.880

Link: CVE-2026-4937

Redhat

No data.

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Platform Keystore on affected firmware versions, as those keys are considered weak.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>Fully remediating this CVE requires administrators that have enabled Platform Keystore to take the following actions:</p><ul><li>Reboot any partitions that have Platform Keystore enabled after updating firmware.</li><li>Regenerate all cryptographic keys that were generated by Platform Keystore on affected firmware versions, as those keys are considered weak.</li></ul>"}]}], "solutions": [{"lang": "en", "value": "Customers with the products below should install FW1110.30(1110_125), FW1120.00(1120_159), or newer to remediate this vulnerability.\nPower 11\n\n * IBM Power System E1180 (9080-HEU)\n\n\nCustomers with the products below should install FW1110.30(1110_145), FW1120.00(1120_183), or newer to remediate this vulnerability.\nPower 11\n\n * IBM Power System S1122 (9824-22A)\n * IBM Power System S1124 (9824-42A)\n * IBM Power System S1122s (9824-22B)\n * IBM Power System S1114 (9824-41B)\n * IBM Power System L1122 (9856-22H)\n * IBM Power System L1124 (9856-42H)\n * IBM Power System E1150 (9043-MRU)\n\n\nCustomers with the products below should install FW1060.72(1060_171) / FW1060.80(1060_180), or newer to remediate this vulnerability.\nPower 10\n\n * IBM Power System E1080 (9080-HEX)\n\n\nCustomers with the products below should install FW1060.72(1060_177) / FW1060.80(1060_185), or newer to remediate this vulnerability.\nPower 10\n\n * IBM Power System S1022 (9105-22A)\n * IBM Power System S1024 (9105-42A)\n * IBM Power System S1022s (9105-22B)\n * IBM Power System S1014 (9105-41B)\n * IBM Power System L1022 (9786-22H)\n * IBM Power System L1024 (9786-42H)\n * IBM Power System E1050 (9043-MRX)\n * IBM Power System S1012 (9028-21B)\n\n\nCustomers with the products below should install FW950.H3(950_230) or newer to remediate this vulnerability.\nPower 9\n\n * IBM Power System S922 (9009-22G)\n * IBM Power System H922 (9223-22S)\n * IBM Power System S914 (9009-41G)\n * IBM Power System S924 (9009-42G)\n * IBM Power System H924 (9223-42S)\n * IBM Power System E950 (9040-MR9)\n * IBM Power System E980 (9080-M9S)\n\n\nThe images mentioned above can be located at IBM Fix Central : https://www.ibm.com/support/fixcentral/ https://www.ibm.com/support/fixcentral/", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>Customers with the products below should install FW1110.30(1110_125), FW1120.00(1120_159), or newer to remediate this vulnerability.<br/>Power 11</p><ol><li>IBM Power System E1180 (9080-HEU)</li></ol><p>Customers with the products below should install FW1110.30(1110_145), FW1120.00(1120_183), or newer to remediate this vulnerability.<br/>Power 11</p><ol><li>IBM Power System S1122 (9824-22A)</li><li>IBM Power System S1124 (9824-42A)</li><li>IBM Power System S1122s (9824-22B)</li><li>IBM Power System S1114 (9824-41B)</li><li>IBM Power System L1122 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H922 (9223-22S)</li><li>IBM Power System S914 (9009-41G)</li><li>IBM Power System S924 (9009-42G)</li><li>IBM Power System H924 (9223-42S)</li><li>IBM Power System E950 (9040-MR9)</li><li>IBM Power System E980 (9080-M9S)</li></ol><p><em>The images mentioned above can be located at IBM Fix Central : </em><a href=\"https://www.ibm.com/support/fixcentral/\" rel=\"noopener noreferrer nofollow\"><em>https://www.ibm.com/support/fixcentral/</em></a></p>"}]}]}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-08-20T14:18:54.835231Z", "id": "CVE-2026-4937", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-20T15:20:20.047Z"}}]}}

{"affected": [{"affectedData": [{"cpes": ["cpe:2.3:o:ibm:power_systems_firmware:fw1110.00:*:*:*:*:*:*:*", "cpe:2.3:o:ibm:power_systems_firmware:fw1110.20:*:*:*:*:*:*:*", "cpe:2.3:o:ibm:power_systems_firmware:fw1060.00:*:*:*:*:*:*:*", "cpe:2.3:o:ibm:power_systems_firmware:fw1060.71:*:*:*:*:*:*:*", "cpe:2.3:o:ibm:power_systems_firmware:fw950.00:*:*:*:*:*:*:*", "cpe:2.3:o:ibm:power_systems_firmware:fw950.h2:*:*:*:*:*:*:*"], "product": "PowerVM Hypervisor", "vendor": "IBM", "versions": [{"lessThanOrEqual": "FW1110.20", "status": "affected", "version": "FW1110.00", "versionType": "semver"}, {"lessThanOrEqual": "FW1060.71", "status": "affected", "version": "FW1060.00", "versionType": "semver"}, {"lessThanOrEqual": "FW950.H2", "status": "affected", "version": "FW950.00", "versionType": "semver"}]}], "source": "psirt@us.ibm.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-4937", "lastModified": "2026-08-20T16:17:24.880", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "HIGH", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 0.8, "impactScore": 4.0, "source": "psirt@us.ibm.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-4937", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-20T14:18:54.835231Z", "version": "2.0.3"}}]}, "published": "2026-08-19T21:16:55.570", "references": [{"source": "psirt@us.ibm.com", "url": "https://www.ibm.com/support/pages/node/7283900"}], "sourceIdentifier": "psirt@us.ibm.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-331"}], "source": "psirt@us.ibm.com", "type": "Secondary"}]}