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Security Bulletin: The PowerVM hypervisor can violate the isolation between peer VMs in certain scenarios

Security Bulletin


A specific sequence of VM management operations from the management console (HMC, Novalink, or PowerVC) can lead to a violation of the isolation between peer VMs.

Vulnerability Details

CVEID:   CVE-2021-38918
DESCRIPTION:   IBM PowerVM Hypervisor through a specific sequence of VM management operations could lead to a violation of the isolation between peer VMs.
CVSS Base score: 8.6
CVSS Temporal Score: See: for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N)

Affected Products and Versions

Affected Product(s)Version(s)
PowerVM HypervisorFW860
PowerVM HypervisorFW1010
PowerVM HypervisorFW940
PowerVM HypervisorFW950


Customers with the products below should install FW860.A2(860_236), FW940.50(940_095), FW950.30(950_092), FW1010.01(1010_69) or newer to remediate this concern.

Power 8

1) IBM Power System S812 (8284-21A)

2) IBM Power System S822 (8284-22A)

3) IBM Power System S814 (8286-41A)

4) IBM Power System S824 (8286-42A)

5) IBM Power System E850 (8408-E8E)

6) IBM Power System E850C (8408-44E)

7) IBM Power System E870 (9119-MME)

8) IBM Power System E880 (9119-MHE)

9) IBM Power System E870C (9080-MME)

10) IBM Power System E880C (9080-MHE)

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

02 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.

Document Location


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Document Information

Modified date:
09 December 2021