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6.2
MEDIUM CVSS 3.1
CVE-2026-4936
Power System Insufficient Entropy
Overview
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.

Details
INFO

Published Date :

Aug. 19, 2026, 9:16 p.m.

Last Modified :

Aug. 25, 2026, 8:36 p.m.

Remotely Exploit :

No

Source :

[email protected]
Impact
Affected Products

The following products are affected by CVE-2026-4936 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Ibm powervm_hypervisor
2 Ibm powervm_hypervisor
3 Ibm power_system_e1080_\(9080-hex\)_firmware
4 Ibm power_system_e1080_\(9080-hex\)
5 Ibm power_system_s922_\(9009-22g\)_firmware
6 Ibm power_system_s922_\(9009-22g\)
7 Ibm power_system_h922_\(9223-22s\)_firmware
8 Ibm power_system_h922_\(9223-22s\)
9 Ibm power_system_s914_\(9009-41g\)_firmware
10 Ibm power_system_s914_\(9009-41g\)
11 Ibm power_system_s924_\(9009-42g\)_firmware
12 Ibm power_system_s924_\(9009-42g\)
13 Ibm power_system_h924_\(9223-42s\)_firmware
14 Ibm power_system_h924_\(9223-42s\)
15 Ibm power_system_e950_\(9040-mr9\)_firmware
16 Ibm power_system_e950_\(9040-mr9\)
17 Ibm power_system_e980_\(9080-m9s\)_firmware
18 Ibm power_system_e980_\(9080-m9s\)
19 Ibm power_system_e1050_\(9043-mrx\)
20 Ibm power_system_l1022_\(9786-22h\)
21 Ibm power_system_l1024_\(9786-42h\)
22 Ibm power_system_s1012_\(9028-21b\)
23 Ibm power_system_s1014_\(9105-41b\)
24 Ibm power_system_s1022_\(9105-22a\)
25 Ibm power_system_s1022s_\(9105-22b\)
26 Ibm power_system_s1024_\(9105-42a\)
27 Ibm power_system_e1180_\(9080-heu\)_firmware
28 Ibm power_system_e1180_\(9080-heu\)
29 Ibm power_system_s1122_\(9824-22a\)_firmware
30 Ibm power_system_s1122_\(9824-22a\)
31 Ibm power_system_s1124_\(9824-42a\)_firmware
32 Ibm power_system_s1124_\(9824-42a\)
33 Ibm power_system_s1122s_\(9824-22b\)_firmware
34 Ibm power_system_s1122s_\(9824-22b\)
35 Ibm power_system_s1114_\(9824-41b\)_firmware
36 Ibm power_system_s1114_\(9824-41b\)
37 Ibm power_system_l1122_\(9856-22h\)_firmware
38 Ibm power_system_l1122_\(9856-22h\)
39 Ibm power_system_l1124_\(9856-42h\)_firmware
40 Ibm power_system_l1124_\(9856-42h\)
41 Ibm power_system_e1150_\(9043-mru\)_firmware
42 Ibm power_system_e1150_\(9043-mru\)
43 Ibm power_system_s1112_\(9242-21b\)_firmware
44 Ibm power_system_s1112_\(9242-21b\)
45 Ibm power_system_s1112_\(9242-21t\)_firmware
46 Ibm power_system_s1112_\(9242-21t\)
47 Ibm power_system_s1022_\(9105-22a\)_firmware
48 Ibm power_system_s1024_\(9105-42a\)_firmware
49 Ibm power_system_s1022s_\(9105-22b\)_firmware
50 Ibm power_system_s1014_\(9105-41b\)_firmware
51 Ibm power_system_l1022_\(9786-22h\)_firmware
52 Ibm power_system_l1024_\(9786-42h\)_firmware
53 Ibm power_system_e1050_\(9043-mrx\)_firmware
54 Ibm power_system_s1012_\(9028-21b\)_firmware
: Total Affected Vendor : 1 | Products : 54
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 134c704f-9b21-4f2e-91b3-4a467353bcc0
CVSS 3.1 MEDIUM 9a959283-ebb5-44b6-b705-dcc2bbced522
CVSS 3.1 MEDIUM [email protected]
CVSS 3.1 MEDIUM MITRE-CVE
CVSS 3.1 MEDIUM [email protected]
Solution
Update firmware to resolve weak AES key generation due to persistent storage key seeds.
  • Update firmware to the latest version.
  • Apply security patches for PKS and virtual TPM.
  • Verify key strength after firmware update.
References
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-4936.

URL Resource
https://www.ibm.com/support/pages/node/7283890 Vendor Advisory
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-4936 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-4936 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-4936 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-4936 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Initial Analysis by [email protected]

    Aug. 25, 2026

    Action Type Old Value New Value
    Added CVSS V3.1 AV:A/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
    Added CPE Configuration AND OR *cpe:2.3:o:ibm:power_system_s1122_(9824-22a)_firmware:fw1120.00:*:*:*:*:*:*:* *cpe:2.3:o:ibm:power_system_s1122_(9824-22a)_firmware:*:*:*:*:*:*:*:* versions from (including) fw1110.00 up to (excluding) fw1110.30 OR cpe:2.3:h:ibm:power_system_s1122_(9824-22a):-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:ibm:power_system_s1124_(9824-42a)_firmware:fw1120.00:*:*:*:*:*:*:* *cpe:2.3:o:ibm:power_system_s1124_(9824-42a)_firmware:*:*:*:*:*:*:*:* versions from (including) fw1110.00 up to (excluding) fw1110.30 OR cpe:2.3:h:ibm:power_system_s1124_(9824-42a):-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:ibm:power_system_s1122s_(9824-22b)_firmware:fw1120.00:*:*:*:*:*:*:* *cpe:2.3:o:ibm:power_system_s1122s_(9824-22b)_firmware:*:*:*:*:*:*:*:* versions from (including) fw1110.00 up to (excluding) fw1110.30 OR cpe:2.3:h:ibm:power_system_s1122s_(9824-22b):-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:ibm:power_system_s1114_(9824-41b)_firmware:fw1120.00:*:*:*:*:*:*:* *cpe:2.3:o:ibm:power_system_s1114_(9824-41b)_firmware:*:*:*:*:*:*:*:* versions from (including) fw1110.00 up to (excluding) fw1110.30 OR cpe:2.3:h:ibm:power_system_s1114_(9824-41b):-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:ibm:power_system_l1122_(9856-22h)_firmware:fw1120.00:*:*:*:*:*:*:* *cpe:2.3:o:ibm:power_system_l1122_(9856-22h)_firmware:*:*:*:*:*:*:*:* versions from (including) fw1110.00 up to (excluding) fw1110.30 OR cpe:2.3:h:ibm:power_system_l1122_(9856-22h):-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:ibm:power_system_l1124_(9856-42h)_firmware:fw1120.00:*:*:*:*:*:*:* *cpe:2.3:o:ibm:power_system_l1124_(9856-42h)_firmware:*:*:*:*:*:*:*:* versions from (including) fw1110.00 up to (excluding) fw1110.30 OR cpe:2.3:h:ibm:power_system_l1124_(9856-42h):-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:ibm:power_system_e1150_(9043-mru)_firmware:fw1120.00:*:*:*:*:*:*:* *cpe:2.3:o:ibm:power_system_e1150_(9043-mru)_firmware:*:*:*:*:*:*:*:* versions from (including) fw1110.00 up to (excluding) fw1110.30 OR cpe:2.3:h:ibm:power_system_e1150_(9043-mru):-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:ibm:power_system_s1112_(9242-21b)_firmware:fw1120.00:*:*:*:*:*:*:* OR cpe:2.3:h:ibm:power_system_s1112_(9242-21b):-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:ibm:power_system_s1112_(9242-21t)_firmware:fw1120.00:*:*:*:*:*:*:* OR cpe:2.3:h:ibm:power_system_s1112_(9242-21t):-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:ibm:power_system_e1080_(9080-hex)_firmware:*:*:*:*:*:*:*:* versions from (including) fw1060.00 up to (excluding) fw1060.72 OR cpe:2.3:h:ibm:power_system_e1080_(9080-hex):-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:ibm:power_system_s1022_(9105-22a)_firmware:*:*:*:*:*:*:*:* versions from (including) fw1060.00 up to (excluding) fw1060.72 OR cpe:2.3:h:ibm:power_system_s1022_(9105-22a):-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:ibm:power_system_s1024_(9105-42a)_firmware:*:*:*:*:*:*:*:* versions from (including) fw1060.00 up to (excluding) fw1060.72 OR cpe:2.3:h:ibm:power_system_s1024_(9105-42a):-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:ibm:power_system_s1022s_(9105-22b)_firmware:*:*:*:*:*:*:*:* versions from (including) fw1060.00 up to (excluding) fw1060.72 OR cpe:2.3:h:ibm:power_system_s1022s_(9105-22b):-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:ibm:power_system_s1014_(9105-41b)_firmware:*:*:*:*:*:*:*:* versions from (including) fw1060.00 up to (excluding) fw1060.72 OR cpe:2.3:h:ibm:power_system_s1014_(9105-41b):-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:ibm:power_system_l1022_(9786-22h)_firmware:*:*:*:*:*:*:*:* versions from (including) fw1060.00 up to (excluding) fw1060.72 OR cpe:2.3:h:ibm:power_system_l1022_(9786-22h):-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:ibm:power_system_l1024_(9786-42h)_firmware:*:*:*:*:*:*:*:* versions from (including) fw1060.00 up to (excluding) fw1060.72 OR cpe:2.3:h:ibm:power_system_l1024_(9786-42h):-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:ibm:power_system_e1050_(9043-mrx)_firmware:*:*:*:*:*:*:*:* versions from (including) fw1060.00 up to (excluding) fw1060.72 OR cpe:2.3:h:ibm:power_system_e1050_(9043-mrx):-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:ibm:power_system_s1012_(9028-21b)_firmware:*:*:*:*:*:*:*:* versions from (including) fw1060.00 up to (excluding) fw1060.72 OR cpe:2.3:h:ibm:power_system_s1012_(9028-21b):-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:ibm:power_system_e1180_(9080-heu)_firmware:fw1120.00:*:*:*:*:*:*:* *cpe:2.3:o:ibm:power_system_e1180_(9080-heu)_firmware:*:*:*:*:*:*:*:* versions from (including) fw1110.00 up to (excluding) fw1110.30 OR cpe:2.3:h:ibm:power_system_e1180_(9080-heu):-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:ibm:power_system_s922_(9009-22g)_firmware:*:*:*:*:*:*:*:* versions from (including) fw950.00 up to (excluding) fw950.h3 OR cpe:2.3:h:ibm:power_system_s922_(9009-22g):-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:ibm:power_system_h922_(9223-22s)_firmware:*:*:*:*:*:*:*:* versions from (including) fw950.00 up to (excluding) fw950.h3 OR cpe:2.3:h:ibm:power_system_h922_(9223-22s):-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:ibm:power_system_s914_(9009-41g)_firmware:*:*:*:*:*:*:*:* versions from (including) fw950.00 up to (excluding) fw950.h3 OR cpe:2.3:h:ibm:power_system_s914_(9009-41g):-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:ibm:power_system_s924_(9009-42g)_firmware:*:*:*:*:*:*:*:* versions from (including) fw950.00 up to (excluding) fw950.h3 OR cpe:2.3:h:ibm:power_system_s924_(9009-42g):-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:ibm:power_system_h924_(9223-42s)_firmware:*:*:*:*:*:*:*:* versions from (including) fw950.00 up to (excluding) fw950.h3 OR cpe:2.3:h:ibm:power_system_h924_(9223-42s):-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:ibm:power_system_e950_(9040-mr9)_firmware:*:*:*:*:*:*:*:* versions from (including) fw950.00 up to (excluding) fw950.h3 OR cpe:2.3:h:ibm:power_system_e950_(9040-mr9):-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:ibm:power_system_e980_(9080-m9s)_firmware:*:*:*:*:*:*:*:* versions from (including) fw950.00 up to (excluding) fw950.h3 OR cpe:2.3:h:ibm:power_system_e980_(9080-m9s):-:*:*:*:*:*:*:*
    Added Reference Type IBM Corporation: https://www.ibm.com/support/pages/node/7283890 Types: Vendor Advisory
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Aug. 20, 2026

    Action Type Old Value New Value
    Added SSVC {'id': 'CVE-2026-4936', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-08-20T13:28:12.630911Z'}
  • New CVE Received by [email protected]

    Aug. 19, 2026

    Action Type Old Value New Value
    Added Affected [{'cpes': ['cpe:2.3:o:ibm:power_systems_firmware:fw1110.00:*:*:*:*:*:*:*', 'cpe:2.3:o:ibm:power_systems_firmware:fw1110.20:*:*:*:*:*:*:*', 'cpe:2.3:o:ibm:power_systems_firmware:fw1060.00:*:*:*:*:*:*:*', 'cpe:2.3:o:ibm:power_systems_firmware:fw1060.71:*:*:*:*:*:*:*', 'cpe:2.3:o:ibm:power_systems_firmware:fw950.00:*:*:*:*:*:*:*', 'cpe:2.3:o:ibm:power_systems_firmware:fw950.h2:*:*:*:*:*:*:*'], 'vendor': 'IBM', 'product': 'PowerVM Hypervisor', 'versions': [{'status': 'affected', 'version': 'FW1110.00', 'versionType': 'semver', 'lessThanOrEqual': 'FW1110.20'}, {'status': 'affected', 'version': 'FW1060.00', 'versionType': 'semver', 'lessThanOrEqual': 'FW1060.71'}, {'status': 'affected', 'version': 'FW950.00', 'versionType': 'semver', 'lessThanOrEqual': 'FW950.H2'}]}]
    Added 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.
    Added CVSS V3.1 AV:A/AC:H/PR:H/UI:R/S:C/C:H/I:N/A:N
    Added CWE CWE-331
    Added Reference https://www.ibm.com/support/pages/node/7283890
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
Base CVSS Score: 6.2
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact