Free and open · new CVEs checked every 20 minutesStatusRSSOpen dataContact

CVE-2026-18870: IBM PowerVM Hypervisor FW1120.00 through FW1120.01, FW1110.00 through FW1110.31, FW1060.00 through FW1060.81,

17
Routine
MEDIUM 4.3UPGRADEUPGRADEUPGRADE

CVE-2026-18870 is a medium-severity flaw (CVSS 4.3) 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 through FW1120.01, FW1110.00 through FW1110.31, FW1060.00 through FW1060.81, and FW950.00 through FW950.H3 could allow a remote attacker to obtain sensitive information due to an out-of-bounds read.

Why this priority

  • No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score4.3 (Medium)
Attack vectorAdjacent network
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance0.2% (top 92%)
CISA exploited listNo
WeaknessCWE-125
Published2026-09-24
Last modified2026-09-30
Publisher (CNA): IBM Corporation · Vendor: ibm

Share: LinkedIn · X · Reddit

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

Am I affected?

Timeline

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-2026-18870?

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-2026-18870 being exploited?

CVE-2026-18870 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-2026-18870 affect?

CVE-2026-18870 affects power system s1122 \(9824-22a\) firmware, power system s1124 \(9824-42a\) firmware, power system s1122s \(9824-22b\) firmware. Severity is medium (CVSS 4.3). IBM PowerVM Hypervisor FW1120.00 through FW1120.01, FW1110.00 through FW1110.31, FW1060.00 through FW1060.81, and FW950.00 through FW950.H3 could allow a remote attacker to obtain sensitive information due to an out-of-bounds read.

How urgent is CVE-2026-18870?

Priority 17/100. No elevated risk signals yet.

Related CVEs

References

← Back to latest CVEs

Get the weekly exploited-CVE digest by emailThe CVEs being attacked this week and how to fix them. No spam, unsubscribe any time.