CVE-2026-16707: IBM PowerVM Hypervisor FW1120.00, FW1110.00 through FW1110.30, FW1060.00 through FW1060.80, and FW950.00 throu

Q: How do I fix CVE-2026-16707?

power system s1122 \(9824-22a\) firmware: upgrade to fw1110.31; power system s1124 \(9824-42a\) firmware: upgrade to fw1110.31; power system s1122s \(9824-22b\) firmware: upgrade to fw1110.31. Exact commands for each OS are on this page.

Q: Is CVE-2026-16707 being exploited?

CVE-2026-16707 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-16707 affect?

CVE-2026-16707 affects power system s1122 \(9824-22a\) firmware, power system s1124 \(9824-42a\) firmware, power system s1122s \(9824-22b\) firmware. Severity is high (CVSS 8.2). IBM PowerVM Hypervisor FW1120.00, FW1110.00 through FW1110.30, FW1060.00 through FW1060.80, and FW950.00 through FW950.H2 is affected by a vulnerability in the service processor mailbox interface. An attacker with authenticated service-leve

Routine

HIGH 8.2UPGRADEUPGRADEUPGRADE

CVE-2026-16707 is a high-severity flaw (CVSS 8.2) affecting power system s1122 \(9824-22a\) firmware, power system s1124 \(9824-42a\) firmware, power system s1122s \(9824-22b\) firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

IBM PowerVM Hypervisor FW1120.00, FW1110.00 through FW1110.30, FW1060.00 through FW1060.80, and FW950.00 through FW950.H2 is affected by a vulnerability in the service processor mailbox interface. An attacker with authenticated service-level access to the FSP can send a specially crafted mailbox message to read or modify arbitrary regions of Hostboot memory, compromising the host firmware boot stack and the hypervisor subsequently loaded by it. S

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.2 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.2% (top 94%)
CISA exploited list	No
Weakness	CWE-125
Published	2026-08-19
Last modified	2026-08-25

Publisher (CNA): IBM Corporation · Vendor: ibm

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

Am I affected?

Timeline

2026-08-19 20:17 UTCPublished CVE record published
2026-08-25 19:34 UTCUpdated Record last modified

ibm power system s1122 \(9824-22a\) firmware UPGRADE

Affected: >= fw1110.00 and < fw1110.31 · fw1120.00

Fixed in: fw1110.31

Safe to downgrade to: a release before fw1110.00

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 s1124 \(9824-42a\) firmware UPGRADE

Affected: >= fw1110.00 and < fw1110.31 · fw1120.00

Fixed in: fw1110.31

Safe to downgrade to: a release before fw1110.00

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 s1122s \(9824-22b\) firmware UPGRADE

Affected: >= fw1110.00 and < fw1110.31 · fw1120.00

Fixed in: fw1110.31

Safe to downgrade to: a release before fw1110.00

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 s1114 \(9824-41b\) firmware UPGRADE

Affected: >= fw1110.00 and < fw1110.31 · fw1120.00

Fixed in: fw1110.31

Safe to downgrade to: a release before fw1110.00

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 l1122 \(9856-22h\) firmware UPGRADE

Affected: >= fw1110.00 and < fw1110.31 · fw1120.00

Fixed in: fw1110.31

Safe to downgrade to: a release before fw1110.00

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 l1124 \(9856-42h\) firmware UPGRADE

Affected: >= fw1110.00 and < fw1110.31 · fw1120.00

Fixed in: fw1110.31

Safe to downgrade to: a release before fw1110.00

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-2026-16707?

power system s1122 \(9824-22a\) firmware: upgrade to fw1110.31; power system s1124 \(9824-42a\) firmware: upgrade to fw1110.31; power system s1122s \(9824-22b\) firmware: upgrade to fw1110.31. Exact commands for each OS are on this page.

Is CVE-2026-16707 being exploited?

CVE-2026-16707 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-2026-16707 affect?

CVE-2026-16707 affects power system s1122 \(9824-22a\) firmware, power system s1124 \(9824-42a\) firmware, power system s1122s \(9824-22b\) firmware. Severity is high (CVSS 8.2). IBM PowerVM Hypervisor FW1120.00, FW1110.00 through FW1110.30, FW1060.00 through FW1060.80, and FW950.00 through FW950.H2 is affected by a vulnerability in the service processor mailbox interface. An attacker with authenticated service-leve

How urgent is CVE-2026-16707?

Priority 30/100. High severity

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References

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