CVE-2026-4936
MEDIUMCVSS 6.2/10EPSS 0.07%
Last modified
CVE-2026-4936 is a medium-severity vulnerability rated 6.2/10 on the CVSS scale. 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.. EPSS estimates a 0.07% chance of exploitation in the next 30 days.
Description
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.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Ibm | Power System S1122 \(9824-22a\) Firmware | >= fw1110.00, < fw1110.30 |
| Ibm | Power System S1122 \(9824-22a\) Firmware | fw1120.00 |
| Ibm | Power System S1124 \(9824-42a\) Firmware | >= fw1110.00, < fw1110.30 |
| Ibm | Power System S1124 \(9824-42a\) Firmware | fw1120.00 |
| Ibm | Power System S1122s \(9824-22b\) Firmware | >= fw1110.00, < fw1110.30 |
| Ibm | Power System S1122s \(9824-22b\) Firmware | fw1120.00 |
| Ibm | Power System S1114 \(9824-41b\) Firmware | >= fw1110.00, < fw1110.30 |
| Ibm | Power System S1114 \(9824-41b\) Firmware | fw1120.00 |
| Ibm | Power System L1122 \(9856-22h\) Firmware | >= fw1110.00, < fw1110.30 |
| Ibm | Power System L1122 \(9856-22h\) Firmware | fw1120.00 |
| Ibm | Power System L1124 \(9856-42h\) Firmware | >= fw1110.00, < fw1110.30 |
| Ibm | Power System L1124 \(9856-42h\) Firmware | fw1120.00 |
| Ibm | Power System E1150 \(9043-Mru\) Firmware | >= fw1110.00, < fw1110.30 |
| Ibm | Power System E1150 \(9043-Mru\) Firmware | fw1120.00 |
| Ibm | Power System S1112 \(9242-21b\) Firmware | fw1120.00 |
| Ibm | Power System S1112 \(9242-21t\) Firmware | fw1120.00 |
| Ibm | Power System E1080 \(9080-Hex\) Firmware | >= fw1060.00, < fw1060.72 |
| Ibm | Power System S1022 \(9105-22a\) Firmware | >= fw1060.00, < fw1060.72 |
| Ibm | Power System S1024 \(9105-42a\) Firmware | >= fw1060.00, < fw1060.72 |
| Ibm | Power System S1022s \(9105-22b\) Firmware | >= fw1060.00, < fw1060.72 |
| Ibm | Power System S1014 \(9105-41b\) Firmware | >= fw1060.00, < fw1060.72 |
| Ibm | Power System L1022 \(9786-22h\) Firmware | >= fw1060.00, < fw1060.72 |
| Ibm | Power System L1024 \(9786-42h\) Firmware | >= fw1060.00, < fw1060.72 |
| Ibm | Power System E1050 \(9043-Mrx\) Firmware | >= fw1060.00, < fw1060.72 |
| Ibm | Power System S1012 \(9028-21b\) Firmware | >= fw1060.00, < fw1060.72 |
| Ibm | Power System E1180 \(9080-Heu\) Firmware | >= fw1110.00, < fw1110.30 |
| Ibm | Power System E1180 \(9080-Heu\) Firmware | fw1120.00 |
| Ibm | Power System S922 \(9009-22g\) Firmware | >= fw950.00, < fw950.h3 |
| Ibm | Power System H922 \(9223-22s\) Firmware | >= fw950.00, < fw950.h3 |
| Ibm | Power System S914 \(9009-41g\) Firmware | >= fw950.00, < fw950.h3 |
| Ibm | Power System S924 \(9009-42g\) Firmware | >= fw950.00, < fw950.h3 |
| Ibm | Power System H924 \(9223-42s\) Firmware | >= fw950.00, < fw950.h3 |
| Ibm | Power System E950 \(9040-Mr9\) Firmware | >= fw950.00, < fw950.h3 |
| Ibm | Power System E980 \(9080-M9s\) Firmware | >= fw950.00, < fw950.h3 |
References
- https://www.ibm.com/support/pages/node/7283890Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-4936?
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.
How severe is CVE-2026-4936?
CVE-2026-4936 has a CVSS score of 6.2/10 (MEDIUM severity). The EPSS model estimates a 0.07% probability of exploitation in the next 30 days.
How do I fix CVE-2026-4936?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2026-4936?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST