Based on the wiki, there's no back-injury designation for Jordan Love — his page shows him playing through Week 6 (a 90-yard TD drive vs. Dallas) and Week 7 (the 20-17 loss to Detroit), so he appears to be active. The only injury-adjacent story around him is the Packers' offensive line crisis (center Sean Rhyan out 4-6 weeks), not a back issue for Love himself.
Worth noting: the wiki doesn't appear to have a page addressing a Love back injury specifically, so I can't confirm a Week 8 status beyond what's there — his page has him preparing to face Carolina. On Fantasy Football Today, the crew did reference an injury to "Love" and noted he "downplayed it," with the caveat that "that's what coaches do this time of year" () — though the wiki itself doesn't corroborate a back injury.
If you can tell me which week you mean, I can check for the most current game-status note.