CVE-2026-4936
Power System Insufficient Entropy
No known exploitation. EPSS puts it in the 1st percentile. A vendor fix is available.
What to do
The vendor has published a fix. Version details are below where the sources state them.
What it is
From the CVE record
IBM PowerVM Hypervisor Platform KeyStore (PKS) and virtual TPM FW1110.00 through FW1110.20, FW1060.00 through FW1060.71, and FW950.00 through FW950.H2 use persistent storage key seeds that result in an AES key with reduced strength. An attacker with access to the service processor or HMC could exploit this weakness to derive the encryption key and access the data.
In plain language
No plain-language summary for this CVE yet.
Exploitation
Where each signal puts this CVE on the scale from published to confirmed exploited.
- CISA KEV
Not in the catalog. CISA has not confirmed exploitation.
- Public exploits
No public exploit or proof of concept found in the sources we track.
- EPSS
0.1% chance of exploitation activity in the next 30 days, which ranks it in the 1st percentile of scored CVEs.
Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.
Lifecycle
11 events over 6 days, from the signal feeds we watch.
- Patch availableworkaround available, record updated
- Patch availableworkaround available, record updated
- Patch availableworkaround available, published, weakness classified, record updated
Affected products
- PowerVM HypervisorCloud & SaaS / virtualization
- power system s1122 \(9824-22a\) firmwareEnterprise Software / itsm-monitoring
- power system s1124 \(9824-42a\) firmwareEnterprise Software / itsm-monitoring
- power system s1122s \(9824-22b\) firmwareEnterprise Software / itsm-monitoring
- power system s1114 \(9824-41b\) firmwareEnterprise Software / itsm-monitoring
- power system l1122 \(9856-22h\) firmwareEnterprise Software / itsm-monitoring
- power system l1124 \(9856-42h\) firmwareEnterprise Software / itsm-monitoring
- power system e1150 \(9043-mru\) firmwareEnterprise Software / itsm-monitoring
And 19 more affected products. See all after sign-in
Technical detail
CVSS 3.1 vector
Open in the CVSS calculatorCVSS:3.1/AV:A/AC:H/PR:H/UI:R/S:C/C:H/I:N/A:N
Scored 5.1 by NVD.
How it is reached
- Attack Vector AdjacentRequires access to the local network (e.g. same Wi-Fi, Bluetooth)
- Attack Complexity HighRequires specific conditions like a race condition or non-default configuration
- Privileges Required HighRequires admin or elevated privileges
- User Interaction RequiredA user must click a link, open a file, or perform some action
Scope
- Scope ChangedThe exploit can affect other components (e.g. sandbox escape, host compromise from VM)
Impact if exploited
- Confidentiality HighTotal information disclosure — all data in the component is compromised
- Integrity NoneNo integrity impact
- Availability NoneNo availability impact
Weaknesses
Sources
References in the record
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