CVE-2026-18857: IBM OPENBMC FW1120.00 through FW1120.01, FW1110.00 through FW1110.31, and FW1060.00 through FW1060.81 is affec

Q: How do I fix CVE-2026-18857?

power system s1122 \(9824-22a\) firmware: upgrade to fw1110.32, fw1120.02; power system s1124 \(9824-42a\) firmware: upgrade to fw1110.32, fw1120.02; power system s1122s \(9824-22b\) firmware: upgrade to fw1110.32, fw1120.02. Exact commands for each OS are on this page.

Q: Is CVE-2026-18857 being exploited?

CVE-2026-18857 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-2026-18857 affect?

CVE-2026-18857 affects power system s1122 \(9824-22a\) firmware, power system s1124 \(9824-42a\) firmware, power system s1122s \(9824-22b\) firmware. Severity is low (CVSS 3.4). IBM OPENBMC FW1120.00 through FW1120.01, FW1110.00 through FW1110.31, and FW1060.00 through FW1060.81 is affected by a vulnerability in the BMC firmware management interface. The host system can cause the BMC firmware management service to

Q: How urgent is CVE-2026-18857?

Priority 12/100. No elevated risk signals yet.

Routine

LOW 3.4UPGRADEUPGRADEUPGRADE

CVE-2026-18857 is a low-severity flaw (CVSS 3.4) 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 OPENBMC FW1120.00 through FW1120.01, FW1110.00 through FW1110.31, and FW1060.00 through FW1060.81 is affected by a vulnerability in the BMC firmware management interface. The host system can cause the BMC firmware management service to crash or allow a limited amount of BMC internal memory to be read, resulting in a confidentiality and availability impact to the managed system.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	3.4 (Low)
Attack vector	Local
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.1% (top 99%)
CISA exploited list	No
Weakness	CWE-125
Published	2026-09-24
Last modified	2026-09-30

Publisher (CNA): IBM Corporation · Vendor: ibm

Last updated 2026-09-30 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-24 14:17 UTCPublished CVE record published
2026-09-30 16:48 UTCUpdated Record last modified

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

Affected: >= fw1110.00 and < fw1110.32 · >= fw1120.00 and < fw1120.02

Fixed in: fw1110.32, fw1120.02

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 < fw1110.32 · >= fw1120.00 and < fw1120.02

Fixed in: fw1110.32, fw1120.02

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 < fw1110.32 · >= fw1120.00 and < fw1120.02

Fixed in: fw1110.32, fw1120.02

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 < fw1110.32 · >= fw1120.00 and < fw1120.02

Fixed in: fw1110.32, fw1120.02

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 < fw1110.32 · >= fw1120.00 and < fw1120.02

Fixed in: fw1110.32, fw1120.02

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 < fw1110.32 · >= fw1120.00 and < fw1120.02

Fixed in: fw1110.32, fw1120.02

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-2026-18857?

power system s1122 \(9824-22a\) firmware: upgrade to fw1110.32, fw1120.02; power system s1124 \(9824-42a\) firmware: upgrade to fw1110.32, fw1120.02; power system s1122s \(9824-22b\) firmware: upgrade to fw1110.32, fw1120.02. Exact commands for each OS are on this page.

Is CVE-2026-18857 being exploited?

CVE-2026-18857 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-2026-18857 affect?

CVE-2026-18857 affects power system s1122 \(9824-22a\) firmware, power system s1124 \(9824-42a\) firmware, power system s1122s \(9824-22b\) firmware. Severity is low (CVSS 3.4). IBM OPENBMC FW1120.00 through FW1120.01, FW1110.00 through FW1110.31, and FW1060.00 through FW1060.81 is affected by a vulnerability in the BMC firmware management interface. The host system can cause the BMC firmware management service to

How urgent is CVE-2026-18857?

Priority 12/100. No elevated risk signals yet.

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References

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