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Back to active CVEs
Medium ยท CVSS 5.3CVE-2026-4937

Power System Insufficient Entropy

Answer in brief

CVE-2026-4937 records a Medium severity (CVSS 5.3) vulnerability in Power System Insufficient Entropy. The current sources do not mark it as known exploited. The current feed maps IBM/PowerVM Hypervisor (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 19, 2026Updated Aug 25, 2026Source checked Oct 4, 2026First seen by HOL Aug 19, 2026Material review Aug 25, 2026
Upstream Advisory

Key facts

Risk
Medium ยท CVSS 5.3
Exploitation
Not marked as known exploited
Affected software
57 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 5.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps IBM/PowerVM Hypervisor (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
ProductAffected versionsFixed versions
cpe:2.3:h:ibm:power_system_e1050_\(9043-mrx\):-:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:h:ibm:power_system_e1080_\(9080-hex\):-:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:h:ibm:power_system_e1150_\(9043-mru\):-:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:h:ibm:power_system_e1180_\(9080-heu\):-:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:h:ibm:power_system_e950_\(9040-mr9\):-:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:h:ibm:power_system_e980_\(9080-m9s\):-:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:h:ibm:power_system_h922_\(9223-22s\):-:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:h:ibm:power_system_h924_\(9223-42s\):-:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:h:ibm:power_system_l1022_\(9786-22h\):-:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:h:ibm:power_system_l1024_\(9786-42h\):-:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:h:ibm:power_system_l1122_\(9856-22h\):-:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:h:ibm:power_system_l1124_\(9856-42h\):-:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:h:ibm:power_system_s1012_\(9028-21b\):-:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:h:ibm:power_system_s1014_\(9105-41b\):-:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:h:ibm:power_system_s1022_\(9105-22a\):-:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:h:ibm:power_system_s1022s_\(9105-22b\):-:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:h:ibm:power_system_s1024_\(9105-42a\):-:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:h:ibm:power_system_s1114_\(9824-41b\):-:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:h:ibm:power_system_s1122_\(9824-22a\):-:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:h:ibm:power_system_s1122s_\(9824-22b\):-:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:h:ibm:power_system_s1124_\(9824-42a\):-:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:h:ibm:power_system_s914_\(9009-41g\):-:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:h:ibm:power_system_s922_\(9009-22g\):-:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:h:ibm:power_system_s924_\(9009-42g\):-:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:ibm:power_system_e1050_\(9043-mrx\)_firmware:*:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:ibm:power_system_e1080_\(9080-hex\)_firmware:*:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:ibm:power_system_e1150_\(9043-mru\)_firmware:*:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:ibm:power_system_e1150_\(9043-mru\)_firmware:fw1120.00:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:ibm:power_system_e1180_\(9080-heu\)_firmware:*:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:ibm:power_system_e1180_\(9080-heu\)_firmware:fw1120.00:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:ibm:power_system_e950_\(9040-mr9\)_firmware:*:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:ibm:power_system_e980_\(9080-m9s\)_firmware:*:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:ibm:power_system_h922_\(9223-22s\)_firmware:*:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:ibm:power_system_h924_\(9223-42s\)_firmware:*:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:ibm:power_system_l1022_\(9786-22h\)_firmware:*:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:ibm:power_system_l1024_\(9786-42h\)_firmware:*:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:ibm:power_system_l1122_\(9856-22h\)_firmware:*:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:ibm:power_system_l1122_\(9856-22h\)_firmware:fw1120.00:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:ibm:power_system_l1124_\(9856-42h\)_firmware:*:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:ibm:power_system_l1124_\(9856-42h\)_firmware:fw1120.00:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:ibm:power_system_s1012_\(9028-21b\)_firmware:*:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:ibm:power_system_s1014_\(9105-41b\)_firmware:*:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:ibm:power_system_s1022_\(9105-22a\)_firmware:*:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:ibm:power_system_s1022s_\(9105-22b\)_firmware:*:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:ibm:power_system_s1024_\(9105-42a\)_firmware:*:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:ibm:power_system_s1114_\(9824-41b\)_firmware:*:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:ibm:power_system_s1114_\(9824-41b\)_firmware:fw1120.00:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:ibm:power_system_s1122_\(9824-22a\)_firmware:*:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:ibm:power_system_s1122_\(9824-22a\)_firmware:fw1120.00:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:ibm:power_system_s1122s_\(9824-22b\)_firmware:*:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:ibm:power_system_s1122s_\(9824-22b\)_firmware:fw1120.00:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:ibm:power_system_s1124_\(9824-42a\)_firmware:*:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:ibm:power_system_s1124_\(9824-42a\)_firmware:fw1120.00:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:ibm:power_system_s914_\(9009-41g\)_firmware:*:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:ibm:power_system_s922_\(9009-22g\)_firmware:*:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:ibm:power_system_s924_\(9009-42g\)_firmware:*:*:*:*:*:*:*:*Not reportedNot reported
Mapped affected packages and fixed versions
PackageAffected rangeFixed version
IBM/PowerVM HypervisorgenericFW1110.00 || FW1060.00 || FW950.00Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for IBM/PowerVM Hypervisor.
  2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

  1. Published upstream

    Aug 19, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Aug 25, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Aug 19, 2026

Sources and claim methodology

  • Source referenceibm.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

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Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-331
Source
CVE List V5
Source checked
Oct 4, 2026
References
1 linked source
Open source record