Power System Out-of-bounds Read

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-17042
StatePUBLISHED
Assigneribm
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-19 20:17:12 UTC
Updated2026-08-20 13:03:39 UTC
DescriptionIBM Power Systems Firmware FW950.00 through FW950.H2, OP940.00 through OP940.a1 (Power9), and OP940.00 - OP940.81 (Power HMC) is affected by a vulnerability in host firmware NVRAM parsing. An attacker with root access to a guest partition on an OpenPOWER system can write a specially crafted NVRAM image, causing the host firmware boot stage to crash with possible memory corruption. This condition persists until operator intervention — clearing NVRAM via the service processor — to restore normal operation. This vulnerability only affects OpenPOWER systems; systems running PowerVM are not affected. Successful exploitation results in an integrity and availability impact to the managed system.

Risk And Classification

Primary CVSS: v3.1 7.3 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H

EPSS: 0.001050000 probability, percentile 0.012360000 (date 2026-08-21)

Problem Types: CWE-125 | CWE-125 CWE-125 Out-of-bounds Read

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.3HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H
3.1CNACVSS7.3HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
Low
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA IBM Power Systems Firmware affected FW950.00 FW950.H2 semver Not specified
CNA IBM Power Systems Firmware affected OP940.00 OP940.a1 semver Not specified
CNA IBM Power Systems Firmware affected OP940.00 OP940.81 semver Not specified

References

ReferenceSourceLinkTags
www.ibm.com/support/pages/node/7283240 [email protected] www.ibm.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

Solutions

CNA: Customers with the products below should install FW950.H3(950_230) or newer to remediate this vulnerability. Power 9 * IBM Power System S922 (9009-22G) * IBM Power System H922 (9223-22S) * IBM Power System S914 (9009-41G) * IBM Power System S924 (9009-42G) * IBM Power System H924 (9223-42S) * IBM Power System E950 (9040-MR9) * IBM Power System E980 (9080-M9S) Customers with the products below should install OP940.a2 or newer to remediate this vulnerability. Power 9 * IBM Power System AC922 (8335-GTH, 8335-GTX) Customers with the products below should install OP940.82 or newer to remediate this vulnerability. Power Hardware Management Console * IBM Power Hardware Management Console (7063-CR2) The images mentioned above can be located at IBM Fix Central : https://www.ibm.com/support/fixcentral/ https://www.ibm.com/support/fixcentral/

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