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CVE-2026-4937

Power System Insufficient Entropy

Medium5.3EPSS 0.13%
Published
Updated
Reserved
Assigned by
ibm

Description

IBM PowerVM Hypervisor FW1110.00 through FW1110.20, FW1060.00 through FW1060.71, and FW950.00 through FW950.H2 could allow a local attacker with administrative privileges to decrypt encrypted data due to certain hypervisor calls utilizing less entropy than requested.

Scores

CVSS scores of CVE-2026-4937, by who scored it
Scored byCVSSScoreVector
ibmCNA (assigner)3.1Medium5.3CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:N/A:N
NVDNVD · Analyzed3.1Medium6.0CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
EPSS (exploitation in 30 days)
0.13% · top 97% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.3.

Weakness

Affected products

  • IBM · PowerVM Hypervisor

    • affected FW1110.00 – ≤ FW1110.20
    • affected FW1060.00 – ≤ FW1060.71
    • affected FW950.00 – ≤ FW950.H2

What to do

Solution: Customers with the products below should install FW1110.30(1110_125), FW1120.00(1120_159), or newer to remediate this vulnerability. Power 11 * IBM Power System E1180 (9080-HEU) Customers with the products below should install FW1110.30(1110_145), FW1120.00(1120_183), or newer to remediate this vulnerability. Power 11 * IBM Power System S1122 (9824-22A) * IBM Power System S1124 (9824-42A) * IBM Power System S1122s (9824-22B) * IBM Power System S1114 (9824-41B) * IBM Power System L1122 (9856-22H) * IBM Power System L1124 (9856-42H) * IBM Power System E1150 (9043-MRU) Customers with the products below should install FW1060.72(1060_171) / FW1060.80(1060_180), or newer to remediate this vulnerability. Power 10 * IBM Power System E1080 (9080-HEX) Customers with the products below should install FW1060.72(1060_177) / FW1060.80(1060_185), or newer to remediate this vulnerability. Power 10 * IBM Power System S1022 (9105-22A) * IBM Power System S1024 (9105-42A) * IBM Power System S1022s (9105-22B) * IBM Power System S1014 (9105-41B) * IBM Power System L1022 (9786-22H) * IBM Power System L1024 (9786-42H) * IBM Power System E1050 (9043-MRX) * IBM Power System S1012 (9028-21B) Customers with the products below should install FW950.H3(950_230) or newer to remediate this vulnerability. Power 9 * IBM Power System S922 (9009-22G) * IBM Power System H922 (9223-22S) * IBM Power System S914 (9009-41G) * IBM Power System S924 (9009-42G) * IBM Power System H924 (9223-42S) * IBM Power System E950 (9040-MR9) * IBM Power System E980 (9080-M9S) The images mentioned above can be located at IBM Fix Central : https://www.ibm.com/support/fixcentral/ https://www.ibm.com/support/fixcentral/

Workaround: Fully remediating this CVE requires administrators that have enabled Platform Keystore to take the following actions: * Reboot any partitions that have Platform Keystore enabled after updating firmware. * Regenerate all cryptographic keys that were generated by Platform Keystore on affected firmware versions, as those keys are considered weak.

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .