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Security Bulletin:Venom qemu vulnerability affects PowerKVM (CVE-2015-3456)

Security Bulletin


PowerKVM is vulnerable to Venom: Virtualized Environment Neglected Operation Manipulation".

Vulnerability Details

CVEID: CVE-2015-3456

DESCRIPTION: QEMU is vulnerable to a buffer overflow, caused by improper bounds checking by the Floppy Disk Controller (FDC) emulation. By sending specially crafted FDC commands, a guest operating system attacker with access to the FDC I/O ports could overflow a buffer and execute arbitrary code on the system with root privileges. Note: This vulnerability is also being called VENOM.

PowerKVM hosts may be susceptible exploit to this even though floppy disk controllers are not supported devices for PowerKVM guests, as a non-privileged user may create a guest containing the emulation model containing the vulnerability.

CVSS Base Score: 7.7
CVSS Temporal Score: See for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:A/AC:L/Au:S/C:C/I:C/A:C)

Affected Products and Versions

PowerKVM 2.1


Fix is made available via Fix Central ( in 2.1.1 SP2 (build 51) and all later builds and fix packs. For systems currently running fix levels of PowerKVM prior to 2.1.1, please see for prerequisite fixes and instructions. Customers can also update from 2.1.1 (GA and later levels) by using "yum update".

Workarounds and Mitigations


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Change History

26 May 2015 - Initial version
28 May 2015 - Added links to remediation plan
5 June 2015 - Updated remediation plan

*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.

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Document Information

Modified date:
17 June 2018