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CVE-2026-17042: IBM Power Systems Firmware FW950.00 through FW950.H2, OP940.00 through OP940.a1 (Power9), and OP940.00 - OP940

26
Routine
HIGH 7.3UPGRADEUPGRADEUPGRADE

CVE-2026-17042 is a high-severity flaw (CVSS 7.3) affecting power system s922 \(9009-22g\) firmware, power system h922 \(9223-22s\) firmware, power system s914 \(9009-41g\) firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 NVR

Why this priority

  • High severity

A fixed release or distro patch exists.

Risk facts

CVSS score7.3 (High)
Attack vectorLocal
Attack complexityLow
Privileges neededLow
User interactionNone
EPSS exploit chance0.1% (top 97%)
CISA exploited listNo
WeaknessCWE-125
Published2026-08-19
Last modified2026-08-25
Publisher (CNA): IBM Corporation · Vendor: ibm

Share: LinkedIn · X · Reddit

Last updated 2026-08-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

ibm power system s922 \(9009-22g\) firmware UPGRADE
Affected: >= fw950.00 and < fw950.h3
Fixed in: fw950.h3
Safe to downgrade to: a release before fw950.00
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
ibm power system h922 \(9223-22s\) firmware UPGRADE
Affected: >= fw950.00 and < fw950.h3
Fixed in: fw950.h3
Safe to downgrade to: a release before fw950.00
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
ibm power system s914 \(9009-41g\) firmware UPGRADE
Affected: >= fw950.00 and < fw950.h3
Fixed in: fw950.h3
Safe to downgrade to: a release before fw950.00
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
ibm power system s924 \(9009-42g\) firmware UPGRADE
Affected: >= fw950.00 and < fw950.h3
Fixed in: fw950.h3
Safe to downgrade to: a release before fw950.00
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
ibm power system h924 \(9223-42s\) firmware UPGRADE
Affected: >= fw950.00 and < fw950.h3
Fixed in: fw950.h3
Safe to downgrade to: a release before fw950.00
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
ibm power system e950 \(9040-mr9\) firmware UPGRADE
Affected: >= fw950.00 and < fw950.h3
Fixed in: fw950.h3
Safe to downgrade to: a release before fw950.00
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-17042?

power system s922 \(9009-22g\) firmware: upgrade to fw950.h3; power system h922 \(9223-22s\) firmware: upgrade to fw950.h3; power system s914 \(9009-41g\) firmware: upgrade to fw950.h3. Exact commands for each OS are on this page.

Is CVE-2026-17042 being exploited?

CVE-2026-17042 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-17042 affect?

CVE-2026-17042 affects power system s922 \(9009-22g\) firmware, power system h922 \(9223-22s\) firmware, power system s914 \(9009-41g\) firmware. Severity is high (CVSS 7.3). 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 o

How urgent is CVE-2026-17042?

Priority 26/100. High severity

Related CVEs

References

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