a. Cisco Nexus 1000V Virtual Ethernet Module denial of service
The Cisco Nexus 1000V Virtual Ethernet Module (VEM) is a virtual switch for ESX and ESXi. This switch can be added to ESX and ESXi where it replaces the VMware virtual switch and runs as part of the ESX and ESXi kernel.
A flaw in the handling of dropped packets by Cisco Nexus 1000V VEM can cause ESX and ESXi to crash.
The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CVE-2011-0355 to the issue.
The issue is addressed by Cisco in the following releases:
VMware customers are only affected by this vulnerability if they have chosen to deploy the Cisco Nexus 1000V virtual switch as a replacement for the VMware vNetwork Standard Switch or the VMware vNetwork Distributed Switch.
VMware has confirmed that the VMware vNetwork Standard Switch and the VMware vNetwork Distributed Switch are not affected by the vulnerability.
The issue is documented by Cisco in Cisco bug ID CSCtj17451 (see section 5 for a link).