CVE-2026-4936
Power System Insufficient Entropy
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.
Attack profile
How easy it is to exploit
- Attack vector
- Adjacent network
- Complexity
- High
- Privileges needed
- High
- User interaction
- Required
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Power System Insufficient Entropy
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.
- Record
CVE-2026-4936- CVSS 3.1
- 5.1 Medium
CVSS:3.1/AV:A/AC:H/PR:H/UI:R/S:C/C:H/I:N/A:N - Weakness
- CWE-331
- Updated
- 2026-11-02
EUVDEUVD-2026-62845
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.
- Record
EUVD-2026-62845- CVSS 3.1
- 5.1 Medium
CVSS:3.1/AV:A/AC:H/PR:H/UI:R/S:C/C:H/I:N/A:N - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-wmfq-mfcf-jvxp
IBM PowerVM Hypervisor Platform KeyStore (PKS) and virtual TPM FW1110.00 through FW1110.20,...
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.
- Record
GHSA-wmfq-mfcf-jvxp- CVSS 3.1
- 5.1 Medium
CVSS:3.1/AV:A/AC:H/PR:H/UI:R/S:C/C:H/I:N/A:N - Weakness
- CWE-331
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2026-4936- CVSS 3.1
- 5.1 Medium
CVSS:3.1/AV:A/AC:H/PR:H/UI:R/S:C/C:H/I:N/A:N - CVSS 3.1
- 6.2 Medium
CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N - Weakness
- CWE-331
- Updated
- 2026-11-02
Affected products
- ibm powervm hypervisor
- ibm power system e1050 \(9043-mrx\) firmware
- ibm power system e1080 \(9080-hex\) firmware
- ibm power system e1150 \(9043-mru\) firmware
- ibm power system e1180 \(9080-heu\) firmware
- ibm power system e950 \(9040-mr9\) firmware
- ibm power system e980 \(9080-m9s\) firmware
- ibm power system h922 \(9223-22s\) firmware
- ibm power system h924 \(9223-42s\) firmware
- ibm power system l1022 \(9786-22h\) firmware
- ibm power system l1024 \(9786-42h\) firmware
- ibm power system l1122 \(9856-22h\) firmware
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- ibm power system l1124 \(9856-42h\) firmware
- ibm power system s1012 \(9028-21b\) firmware
- ibm power system s1014 \(9105-41b\) firmware
- ibm power system s1022 \(9105-22a\) firmware
- ibm power system s1022s \(9105-22b\) firmware
- ibm power system s1024 \(9105-42a\) firmware
- ibm power system s1112 \(9242-21b\) firmware
- ibm power system s1112 \(9242-21t\) firmware
- ibm power system s1114 \(9824-41b\) firmware
- ibm power system s1122 \(9824-22a\) firmware
- ibm power system s1122s \(9824-22b\) firmware
- ibm power system s1124 \(9824-42a\) firmware
- ibm power system s914 \(9009-41g\) firmware
- ibm power system s922 \(9009-22g\) firmware
- ibm power system s924 \(9009-42g\) firmware
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-4936 is a medium vulnerability (CVSS 5.1) in Ibm Powervm Hypervisor, published August 19, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.10%, the 1st percentile. No source names a fixed version.