The latest version of the stable Linux kernel, 4.4.4, has been revealed today by Greg Kroah-Hartman, which makes it the most advanced stable version available. Even if the official website of the Linux kernel hasn't been updated with this information, the Linux kernel 4.4 branch is an LTS one.
“I'm announcing the release of the 4.4.4 kernel. All users of the 4.4 kernel series must upgrade. The updated 4.4.y git tree can be found at git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git linux-4.4.y and can be browsed at the normal kernel.org git web browser: http://git.kernel.org/?p=linux/kernel/git/stable/linux-stable.git;a=summary,” said Greg Kroah-Hartman in his regular mailing list update.