Power System Incorrect Authorization

published 2026-08-19 2 mo ago modified 2026-08-25 2 mo ago also EUVD-2026-62685

cvss: 8.1; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 4%
public exploits: 0; none known

IBM Power Systems Firmware FW1120.00, FW1110.00 through FW1110.30, FW1060.00 through FW1060.80, FW950.00 through FW950.H2, OP940.00 through OP940.a1 (Power9), and OP940.00 - OP940.81 (Power HMC) is affected by a vulnerability in the interface between the BMC/FSP and the host system. An attacker with service account or root access to the BMC/FSP can write arbitrary data to hardware control registers, allowing full control over the host system and all hosted partitions, resulting in a confidentiality, integrity, and availability impact.

Patch / fix

fixed in 20 links 1

ibm power_system_s1122_(9824-22a)_firmware fw1110.31
ibm power_system_s1124_(9824-42a)_firmware fw1110.31
ibm power_system_s1122s_(9824-22b)_firmware fw1110.31
ibm power_system_s1114_(9824-41b)_firmware fw1110.31
ibm power_system_l1122_(9856-22h)_firmware fw1110.31
ibm power_system_l1124_(9856-42h)_firmware fw1110.31
ibm power_system_e1150_(9043-mru)_firmware fw1110.31
ibm power_system_e1080_(9080-hex)_firmware fw1060.81
ibm power_system_s1022_(9105-22a)_firmware fw1060.81
ibm power_system_s1024_(9105-42a)_firmware fw1060.81
ibm power_system_s1022s_(9105-22b)_firmware fw1060.81
ibm power_system_s1014_(9105-41b)_firmware fw1060.81
ibm power_system_l1022_(9786-22h)_firmware fw1060.81
ibm power_system_l1024_(9786-42h)_firmware fw1060.81
ibm power_system_e1050_(9043-mrx)_firmware fw1060.81
ibm power_system_s1012_(9028-21b)_firmware fw1060.81
ibm power_system_e1180_(9080-heu)_firmware fw1110.31
ibm power_system_s922_(9009-22g)_firmware fw950.h3
ibm power_system_h922_(9223-22s)_firmware fw950.h3
ibm power_system_s914_(9009-41g)_firmware fw950.h3

ibm.com/support/pages/node/7283218 advisory

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 2 mo ago (2026-08-21)

Exploit prediction

0.15% chance of exploitation in the next 30 days, higher than 4% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	8.1	CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:L/I:H/A:H

Affected products

IBM Power Systems Firmware

Classification

Weakness

CWE-863 Incorrect Authorization

References

ibm.com /support/pages/node/7283218
vendor-advisory, patch

Sources

CVE List CVE-2026-17429
NVD CVE-2026-17429

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary