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VMware vCenter Server 5.5 Update 3j Release Notes

vCenter Server 5.5 Update 3j | 14 AUG 2018 | Build 9313450

vCenter Server 5.5 Update 3j Installation Package | 14 AUG 2018 | Build 9319188

vCenter Server Appliance 5.5 Update 3j | 14 AUG 2018 | Build 9316563

Check for additions and updates to these release notes.

What's in the Release Notes

The release notes cover the following topics:

What's New

The vCenter Server 5.5 Update 3j release includes the following list of new features:

  • vCenter Server 5.5 Update 3j and ESXi 5.5 Patch Release ESXi550-201808001 introduce the ESXi advanced configuration option HyperthreadingMitigation. The new option mitigates the vulnerability described in CVE-2018-3646. For more information on vulnerability assessment and full mitigation steps for the vSphere environment, see the VMware Knowledge base article 55636
  • vCenter Server 5.5 Update 3j and ESXi 5.5 Patch Release ESXi550-201808001 introduce the ESXi advanced configuration option SuppressHyperthreadWarning. After the installation of the ESXi patch, if your environment has hosts vulnerable to CVE-2018-3646, an alert is displayed in the Summary tab of either the vSphere Web Client or vSphere Client. SuppressHyperthreadWarning can be used to suppress this alert.

The update from vCenter Server 5.5 Update 3f and later affects only vCenter Server and VMware vCenter Inventory Service and you must upgrade only vCenter Server and vCenter Inventory Service components.

Earlier Releases of vCenter Server 5.5

Features and known issues of vCenter Server are described in the release notes for each release. Release notes for earlier releases of vCenter Server 5.5 are:

For compatibility, installation and upgrades, product support notices, and features see the VMware vCenter Server 5.5 Update 3 Release Notes.

Resolved Issues

The resolved issues are grouped as follows.

Security Issues
  • VMware vCenter Server 5.5 Update 3j is one of several steps needed to mitigate CVE-2018-3646. For more information on vulnerability assessment and full mitigation steps for the vSphere environment, see the VMware Knowledge base article 55636.

Known Issues

The known issues are grouped as follows.

vCenter Server, vSphere Client, and vSphere Web Client
  • Trying to disable the usage of Hyperthreading after enabling the HyperthreadingMitigation option on an ESXi host might trigger an incorrect message in the Processors view

    When you enable the HyperthreadingMitigation option on an ESXi host, by setting VMkernel.Boot.HyperthreadingMitigation to True, the usage of Hyperthreading by this ESXi patch is disabled, regardless of the previous settings. If you decide to change the setting VMkernel.Boot.Hyperthreading to False to disable the option, you might see the message Disabled(Enabled on restart) in the Processors view. In fact, Hyperthreading is not used after the restart.

    Workaround: None. Ignore the message.

  • After patching to vCenter Server 5.5 Update 3j and ESXi550-201808001, the vSphere Client displays a generic message for configuration issues in the Summary tab

    After upgrading your system to vCenter Server 5.5 Update 3j and ESXi550-201808001, you might see a generic message Configuration Issues in the Summary tab of the vSphere Client.

    Workaround: Log in to the vSphere Web Client to see the full message This host is potentially vulnerable to issues described in CVE-2018-3646, please refer to KB55636 for details and VMware recommendations.

Known Issues from Earlier Releases

To view a list of previous known issues, click here.