Non FLC SGX device, Linux Kernel 5.15

[rdockterjr]

For various reasons I'm trying to upgrade my system to Ubuntu 22.04 with linux kernel 5.15. My CPU does not support Flexible Launch Control according to cpuid:

Extended feature bits (EAX=07H, ECX=0H)
eax: 0 ebx: 29c67af ecx: 0 edx: bc002e00
sgx available: 1
sgx launch control: 0

So I'm trying to install the isgx driver. The driver installs just fine both from https://download.01.org/intel-sgx/ as well as if I builld the driver from source. However upon reboot the sgx device does not seem to load properly and dmesg gives me the following output:

[ 0.418012] sgx: EPC section 0x70200000-0x75f7ffff
[ 4.180975] isgx: loading out-of-tree module taints kernel.
[ 4.181011] isgx: module verification failed: signature and/or required key missing - tainting kernel
[ 4.181318] intel_sgx: Intel SGX Driver v2.11.0
[ 4.181326] UBSAN: shift-out-of-bounds in ./linux-sgx-driver/sgx_main.c:224:11
[ 4.181352] sgx_drv_probe.cold+0x1db/0x55b [isgx]
[ 4.181379] ? sgx_drv_probe+0x130/0x130 [isgx]
[ 4.181384] init_sgx_module+0x2f/0x90 [isgx]
[ 4.181450] intel_sgx INT0E0C:00: EPC bank 0x70200000-0x75f80000
[ 4.182815] intel_sgx: can not reset SGX LE public key hash MSRs
[ 4.182873] intel_sgx: second initialization call skipped`

I'm assuming the shift-out-of-bounds out of bounds issue is my problem Has any one else experienced this? Is it just not possible to run older isgx devices on the newest linux kernels?