We released on Sep. 27th (Mon) LTS 2605.21.0 (Kernel 5.4.147), Stable 2905.2.4, and Alpha 3005.0.0 (both Kernel 5.10.67).

However, both Stable 2905.2.4 and Alpha 3005.0.0 have regressions around Mellanox network drivers, so that a machine with the new Kernel could become simply unreachable.
That regression was originally caused by commit fe6322774ca2 in stable Kernel since 5.10.65.
After the bug was reported, the buggy commit was reverted in 5.10.69, which should fix the issue.

Especially some types of bare metal instances on Equinix Metal are affected, including the default type c3.small. The previous default type t1.small is not affected, as it has only Intel NIC.

LTS and Beta channels are not affected.

On Sep. 28th (Tue), we reverted on Nebraska, the update service, the default version of Stable and Alpha channels back to 2905.2.3 and 2983.0.0 respectively. We also have set the current symlinks on *.release.flatcar-linux.net to the previous versions.

We are going to soon prepare Stable/Alpha releases to include Kernel 5.10.69, which includes the bug fix.