We still (unfortunately) have some 6.5 ESXi hosts left.
Anyone knows if these will be afftected?
Or is it only 6.7.x and 7.0.x? (Before patching to latest)
Giving credit to this KB article: https://kb.vmware.com/s/article/90947 we are talking about rather specific versions and there is no reference to version 6.5 of the ESXi product. Then, as we know, the documented problem specifically affects systems built around virtual machines running some edition of the "Microsoft Windows Server 2022" operating system.
But in my view the point is another, since the remedy consists in upgrading to the version of ESXi 7.0U3k or 8.0x discussing previous versions (and perhaps one no longer supported today) leave some time for it.
As you may know, ESXi 6.5 and even 6.7 reached End of Life, and that KB also applies to 6.5.
However, you could have more unexpected issues as Windows Server 2022 is not supported for ESXi 6.5 as you can see in VMware HCL: https://www.vmware.com/resources/compatibility/detail.php?deviceCategory=software&testConfig=16&prod...
If you can upgrade, I encourage you to do it till version 7 at least to apply the proper patches for that KB and to receive support in case something happens.