IBM PowerVM Hypervisor up to FW950.H2/FW1060.71/FW1110.20 KeyStore risky encryption

Summaryinfo

A vulnerability categorized as problematic has been discovered in IBM PowerVM Hypervisor up to FW950.H2/FW1060.71/FW1110.20. This issue affects some unknown processing of the component KeyStore. The manipulation results in risky encryption. This vulnerability was named CVE-2026-4936. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability classified as problematic has been found in IBM PowerVM Hypervisor up to FW950.H2/FW1060.71/FW1110.20. Affected is an unknown functionality of the component KeyStore. The manipulation with an unknown input leads to a risky encryption vulnerability. CWE is classifying the issue as CWE-327. The product uses a broken or risky cryptographic algorithm or protocol. This is going to have an impact on confidentiality. CVE summarizes:

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.

The advisory is shared for download at ibm.com. This vulnerability is traded as CVE-2026-4936 since 03/26/2026. The exploitability is told to be difficult. It is possible to launch the attack remotely. Additional levels of successful authentication are necessary for exploitation. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 08/19/2026). The MITRE ATT&CK project declares the attack technique as T1600.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

• IBM

Name

• PowerVM Hypervisor

Version

• FW950.H2
• FW1060.0
• FW1060.1
• FW1060.2
• FW1060.3
• FW1060.4
• FW1060.5
• FW1060.6
• FW1060.7
• FW1060.8
• FW1060.9
• FW1060.10
• FW1060.11
• FW1060.12
• FW1060.13
• FW1060.14
• FW1060.15
• FW1060.16
• FW1060.17
• FW1060.18
• FW1060.19
• FW1060.20
• FW1060.21
• FW1060.22
• FW1060.23
• FW1060.24
• FW1060.25
• FW1060.26
• FW1060.27
• FW1060.28
• FW1060.29
• FW1060.30
• FW1060.31
• FW1060.32
• FW1060.33
• FW1060.34
• FW1060.35
• FW1060.36
• FW1060.37
• FW1060.38
• FW1060.39
• FW1060.40
• FW1060.41
• FW1060.42
• FW1060.43
• FW1060.44
• FW1060.45
• FW1060.46
• FW1060.47
• FW1060.48
• FW1060.49
• FW1060.50
• FW1060.51
• FW1060.52
• FW1060.53
• FW1060.54
• FW1060.55
• FW1060.56
• FW1060.57
• FW1060.58
• FW1060.59
• FW1060.60
• FW1060.61
• FW1060.62
• FW1060.63
• FW1060.64
• FW1060.65
• FW1060.66
• FW1060.67
• FW1060.68
• FW1060.69
• FW1060.70
• FW1060.71
• FW1110.0
• FW1110.1
• FW1110.2
• FW1110.3
• FW1110.4
• FW1110.5
• FW1110.6
• FW1110.7
• FW1110.8
• FW1110.9
• FW1110.10
• FW1110.11
• FW1110.12
• FW1110.13
• FW1110.14
• FW1110.15
• FW1110.16
• FW1110.17
• FW1110.18
• FW1110.19
• FW1110.20

License

• commercial

Website

• Vendor: https://www.ibm.com/

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