CVE-2026-17429

Host takeover via unauthorized hardware register writes

Published Aug 19, 2026 · Updated Aug 21, 2026

Incorrect authorization in IBM Power Systems Firmware allows local users with BMC/FSP service or root access to control the host. The BMC/FSP-to-host interface fails to prevent those privileged controller accounts from writing arbitrary data directly to hardware control registers. Reaching the flaw requires service-account or root control of the BMC/FSP and grants full control of the host and all hosted partitions.

CVSS severity8.1
High
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Incorrect authorization in IBM Power Systems Firmware allows local users with BMC/FSP service or root access to control the host. The BMC/FSP-to-host interface fails to prevent those privileged controller accounts from writing arbitrary data directly to hardware control registers. Reaching the flaw requires service-account or root control of the BMC/FSP and grants full control of the host and all hosted partitions.

The record

CVE
CVE-2026-17429
Published
Aug 19, 2026
Updated
Aug 21, 2026
Vendor
IBM
Product
Power Systems Firmware
Classifications
CWE-863, T1068
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Aug 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=FW1060.00 <=FW1060.80
  2. Affected versionversion=FW1110.00 <=FW1110.30
  3. Affected versionversion=FW1120.00
  4. Affected versionversion=FW950.00 <=FW950.H2
  5. Affected versionversion=OP940.00 <=OP940.81
  6. Affected versionversion=OP940.00 <=OP940.a1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

IBM · Power Systems Firmwareversion=FW1060.00 <=FW1060.80; version=FW1110.00 <=FW1110.30; version=FW1120.00; version=FW950.00 <=FW950.H2; version=OP940.00 <=OP940.81; version=OP940.00 <=OP940.a1

Published CVSS scores

8.1IBMCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:L/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo