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