Vulnerability in IBM Power System E1050 \(9043-Mrx\) Firmware
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.1 (Medium). Vector: CVSS:3.1/AV:A/AC:H/PR:H/UI:R/S:C/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.001 (1.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 1st percentile — 1.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: +0.000
Affected products
- IBM Power System E1050 \(9043-Mrx\) Firmware
- IBM Power System E1080 \(9080-Hex\) Firmware
- IBM Power System E1150 \(9043-Mru\) Firmware — versions fw1120.00
- IBM Power System E1180 \(9080-Heu\) Firmware — versions fw1120.00
- 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
Weakness classification (CWE)
References
- www.ibm.com/support/pages/node/7283890 (vendor-advisory, patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-4936?
- CVE-2026-4936 is a medium-severity vulnerability in IBM Power System E1050 \(9043-Mrx\) Firmware, classified under Insufficient Entropy. CVSS score: 5.1/10. Published 2026-08-19.
- How severe is CVE-2026-4936?
- Medium severity. CVSS v3 base score is 5.1 out of 10.