When i first heard of xz backdoor, i updated my arch system and the xz-utils package to 5.6.1-3 which in the version numbers seems to be a patch, and it seems to be, so think you're safe from now
Shark is seen as an evil human-eater while in fact there's plenty of animals who kills more humans than him including dolphins(also most shark attacks were in fact accidents).
When i first heard of xz backdoor, i updated my arch system and the xz-utils package to 5.6.1-3 which in the version numbers seems to be a patch, and it seems to be, so think you're safe from now