Gexo is an (most definitely incomplete) iOS 15 Jailbreak, using bind mounts (thanks siguza) or being rootless. The CVE numbers of the vulnerabilities I used are: CVE-2021-30883 & CVE-2021-30955
Gexo should support all arm64e devices (iPhone XS and newer) on iOS 15, 15.0.1, 15.0.2, & 15.1 Beta 1, 2, 3, 15.1 Final & 15.1.1 (A14-A15).
arm64 devices are not supported because the exploit does not work on these devices.
However, it is possible to jailbreak arm64 devices with checkra1n (it works on iOS 12 and up other than 14.8.1 & 15.x)