So looking at the most recent AP Rankings:
1. Alabama lost to Vanderbilt
2. Texas had a bye
3. Ohio State beat Iowa
4. Tennessee lost to Arkansas
5. Georgia beat Auburn
6. Oregon beat MSU
7. Penn State beat UCLA
8. Miami is losing to Cal
9. Missouri lost to Texas A&M
10. Michigan lost to Washington
11. USC lost to Minnesota
12. Ole Miss beat South Carolina
13. LSU had a bye
14. Notre Dame had a bye
15. Clemson beat FSU
16. Iowa State beat Baylor
17. BYU had a bye
18. Utah had a bye
19. Oklahoma had a bye
20. Kansas State had a bye
So 4 in the top 10 lost, and 1 in the top 10 is currently playing and losing. A pretty wild weekend in CFB