Greg has released three stable kernel updates: 22.214.171.124, 126.96.36.199 and 188.8.131.52. There aren't many changes to 184.108.40.206. That series will not be supported much longer. Both 220.127.116.11 and 18.104.22.168 have a fix for a really nasty sigreturn bug on ARM systems, among other changes. Users of these kernel series must upgrade.