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Security Bulletin: The PowerVM hypervisor is vulnerable to a specially crafted sequence of hypervisor calls from a partition that can lead to a system crash

Security Bulletin


An attacker that gains total control of a virtual machine running on the PowerVM hypervisor could issue a specially crafted sequence of hypervisor calls that will lead to a system crash and and an outage of all virtual machines running on the same system

Vulnerability Details

CVEID:   CVE-2021-29795
DESCRIPTION:   IBM PowerVM hypervisor could allow a local user to create a specially crafted sequence of hypervisor calls from a partition that could crash the system.
CVSS Base score: 6
CVSS Temporal Score: See: for the current score.
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H)

Affected Products and Versions

Affected Product(s)
PowerVM Hypervisor
PowerVM HypervisorFW930
PowerVM HypervisorFW940
PowerVM HypervisorFW950


Customers with the products below should install FW860.A0(860_231), FW930.50(930_145), FW940.40(940_080), FW950.10(950_072) 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)

Workarounds and Mitigations


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Change History

20 Aug 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:
20 September 2021