On Wednesday, Greg Kroah-Hartman announced a release update for the major Linux Kernel branches that are still in support. Linux Kernel 4.12 branch, after fourth maintenance release, it announced that the branch has been marked as EOL (End of Life) on Kernel.org and will no longer be updated in the future.
As a result, all users who still use the Linux 4.12 kernel branch must upgrade to a later version, such as the Linux Kernel 4.13 kernel branch released a few weeks ago. Naturally, the user can also choose to upgrade to 4.12.4, but no longer follow-up maintenance updates.