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Security Bulletin: The PowerVM hypervisor is vulnerable to a carefully crafted IBMi hypervisor call that can lead to a system crash

Security Bulletin


The PowerVM hypervisor is vulnerable to a carefully crafted IBMi hypervisor call that can lead to a system crash

Vulnerability Details

CVEID:   CVE-2021-38937
DESCRIPTION:   IBM PowerVM Hypervisor could allow an authenticated user to cause the system to crash using a specially crafted IBMi Hypervisor call.
CVSS Base score: 6.3
CVSS Temporal Score: See: for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H)

Affected Products and Versions

Affected Product(s)Version(s)
PowerVM HypervisorFW1010
PowerVM HypervisorFW940
PowerVM HypervisorFW950


Customers with the products below should install FW940.50(940_095), FW950.30(950_092), FW1010.01(1010_69) or newer to remediate this concern.
Power 9

1) IBM Power System S922 (9009-22A, 9009-22G)

2) IBM Power System H922 (9223-22H, 9223-22S)

3) IBM Power System S914 (9009-41A, 9009-41G)

4) IBM Power System S924 (9009-42A, 9009-42G)

5) IBM Power System H924 (9223-42H, 9223-42S)

6) IBM Power System E950 (9040-MR9)

7) IBM Power System E980 (9080-M98, 9080-M9S)

Power 10

1) IBM Power System E1080 (9080-HEX)

Workarounds and Mitigations


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Change History

03 Dec 2021: Initial Publication

*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.


According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES ""AS IS"" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY. In addition to other efforts to address potential vulnerabilities, IBM periodically updates the record of components contained in our product offerings. As part of that effort, if IBM identifies previously unidentified packages in a product/service inventory, we address relevant vulnerabilities regardless of CVE date. Inclusion of an older CVEID does not demonstrate that the referenced product has been used by IBM since that date, nor that IBM was aware of a vulnerability as of that date. We are making clients aware of relevant vulnerabilities as we become aware of them. "Affected Products and Versions" referenced in IBM Security Bulletins are intended to be only products and versions that are supported by IBM and have not passed their end-of-support or warranty date. Thus, failure to reference unsupported or extended-support products and versions in this Security Bulletin does not constitute a determination by IBM that they are unaffected by the vulnerability. Reference to one or more unsupported versions in this Security Bulletin shall not create an obligation for IBM to provide fixes for any unsupported or extended-support products or versions.

Document Location


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Document Information

Modified date:
09 December 2021