CVE-2026-17042
Power System Out-of-bounds Read
Description
IBM 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.
INFO
Published Date :
Aug. 19, 2026, 8:17 p.m.
Last Modified :
Aug. 25, 2026, 1:14 p.m.
Remotely Exploit :
No
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-17042
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | 9a959283-ebb5-44b6-b705-dcc2bbced522 | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | HIGH | MITRE-CVE |
Solution
- Update firmware on affected IBM Power Systems.
- Clear NVRAM via service processor if affected.
- Apply vendor patches for host firmware.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-17042.
| URL | Resource |
|---|---|
| https://www.ibm.com/support/pages/node/7283240 | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-17042 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-17042
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-17042 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-17042 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Aug. 25, 2026
Action Type Old Value New Value Added CPE Configuration AND OR *cpe:2.3:o:ibm:power_system_s922_(9009-22g)_firmware:*:*:*:*:*:*:*:* versions from (including) fw950.00 up to (excluding) fw950.h3 OR cpe:2.3:h:ibm:power_system_s922_(9009-22g):-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:ibm:power_system_h922_(9223-22s)_firmware:*:*:*:*:*:*:*:* versions from (including) fw950.00 up to (excluding) fw950.h3 OR cpe:2.3:h:ibm:power_system_h922_(9223-22s):-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:ibm:power_system_s914_(9009-41g)_firmware:*:*:*:*:*:*:*:* versions from (including) fw950.00 up to (excluding) fw950.h3 OR cpe:2.3:h:ibm:power_system_s914_(9009-41g):-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:ibm:power_system_s924_(9009-42g)_firmware:*:*:*:*:*:*:*:* versions from (including) fw950.00 up to (excluding) fw950.h3 OR cpe:2.3:h:ibm:power_system_s924_(9009-42g):-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:ibm:power_system_h924_(9223-42s)_firmware:*:*:*:*:*:*:*:* versions from (including) fw950.00 up to (excluding) fw950.h3 OR cpe:2.3:h:ibm:power_system_h924_(9223-42s):-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:ibm:power_system_e950_(9040-mr9)_firmware:*:*:*:*:*:*:*:* versions from (including) fw950.00 up to (excluding) fw950.h3 OR cpe:2.3:h:ibm:power_system_e950_(9040-mr9):-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:ibm:power_system_e980_(9080-m9s)_firmware:*:*:*:*:*:*:*:* versions from (including) fw950.00 up to (excluding) fw950.h3 OR cpe:2.3:h:ibm:power_system_e980_(9080-m9s):-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:ibm:power_system_ac922_(8335-gth)_firmware:*:*:*:*:*:*:*:* versions from (including) op940 up to (excluding) op940.a2 OR cpe:2.3:h:ibm:power_system_ac922_(8335-gth):-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:ibm:power_system_ac922_(8335-gtx)_firmware:*:*:*:*:*:*:*:* versions from (including) op940 up to (excluding) op940.a2 OR cpe:2.3:h:ibm:power_system_ac922_(8335-gtx):-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:ibm:power_hardware_management_console_(7063-cr2)_firmware:*:*:*:*:*:*:*:* versions from (including) op940 up to (excluding) op940.82 OR cpe:2.3:h:ibm:power_hardware_management_console_(7063-cr2):-:*:*:*:*:*:*:* Added Reference Type IBM Corporation: https://www.ibm.com/support/pages/node/7283240 Types: Vendor Advisory -
New CVE Received by [email protected]
Aug. 19, 2026
Action Type Old Value New Value Added Affected [{'cpes': ['cpe:2.3:o:ibm:power_systems_firmware:fw950.00:*:*:*:*:*:*:*', 'cpe:2.3:o:ibm:power_systems_firmware:fw950.h2:*:*:*:*:*:*:*', 'cpe:2.3:o:ibm:power_systems_firmware:op940.00:*:*:*:*:*:*:*', 'cpe:2.3:o:ibm:power_systems_firmware:op940.a1:*:*:*:*:*:*:*'], 'vendor': 'IBM', 'product': 'Power Systems Firmware', 'versions': [{'status': 'affected', 'version': 'FW950.00', 'versionType': 'semver', 'lessThanOrEqual': 'FW950.H2'}, {'status': 'affected', 'version': 'OP940.00', 'versionType': 'semver', 'lessThanOrEqual': 'OP940.a1'}, {'status': 'affected', 'version': 'OP940.00', 'versionType': 'semver', 'lessThanOrEqual': 'OP940.81'}]}] Added Description IBM 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. Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H Added CWE CWE-125 Added Reference https://www.ibm.com/support/pages/node/7283240 -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 19, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-17042', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-08-19T19:24:22.753664Z'}