IP Address Overlap in NSX – An NSX Blog

IP Address Overlap in NSX – An NSX Blog

Introduction: One of my NSX peers was recently working on an IP address overlap issue that helped lead to a better understanding of routing behaviour within an NSX environment. The Scenario: In this corner case scenario there is IP address overlap between these two subnets: The NSX environment, [..]


VMware Social Media Advocacy

Create Windows 11 Virtual Appliance using Tiny…

Create Windows 11 Virtual Appliance using Tiny…

I recently came to learn about a really cool project called Tiny 11 which is a stripped down version of Windows 11 Pro 22H2 that can run with just 2GB of memory and 8GB of storage. While you would probably not use this for production workloads, it could be interesting for those with homelabs and […]


VMware Social Media Advocacy

“SECUREBOOT: Image DENIED.” – Linux VMs created with Hardware version 20 will fail to start installation when Secure Boot is enabled (88737)

Reference “SECUREBOOT: Image DENIED.” for Windows Server 2022
How ESXi Uses UEFI Secure Boot

Important 88737 Symptoms

The installation of the Operating System image will be denied and “SECUREBOOT: Image DENIED.” will be reported in vmware.log.

Below goes the list of the impacted Linux Operating Systems.

  • RHEL 8.0~8.4, 7.x 
  • CentOS 8.0~8.5, 7.x
  • Oracle Linux 8.0~8.3, 7.x
  • AlmaLinux 8.4    
  • Rocky Linux 8.4    
  • Photon OS 4.0GA, 3.0 GA & Rev 2 & Rev 3, 2.0    
  • Ubuntu LTS 20.04~20.04.4, 18.04~18.04.5 and earlier
  • Ubuntu Non-LTS 21.04, 20.10, 19.10, 19.04, 18.10 and earlier     
  • Debian 10.9 and earlier     
  • SLE 12SP0~SP5, 15SP0-SP2

Cause

This is caused due to the Secure Boot deny list (dbx) is updated to prevent vulnerable bootloaders from being used. For more information, refer to VMware response to GRUB2 security vulnerability CVE-2020-10713 (80181)

Resolution

  1. Create the SecureBoot Virtual Machine with Hardware version 19 (or earlier).
  2. After the installation is completed, update the vulnerable bootloader of the VM to a newer and fixed version, refer to VMware response to GRUB2 security vulnerability CVE-2020-10713 (80181)
  3. Upgrade the Virtual Machine’s Hardware version to 20.

Workaround

Create the Virtual Machine with Secureboot disabled instead.

Automated ESXi Installation with a USB Network…

Automated ESXi Installation with a USB Network…

I have been working with the Project Keswick team for quite some time now, which is an OCTO project is lead by my good friend Alan Renouf, who is doing some really innovative work with ESXi at the edge and application deployment using a desired state engine. Recently I had met with the team to […]


VMware Social Media Advocacy