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I have updated the Leap 15.4 kernel today, 17.03.2023, ca. 17:00 on 2 machines
(desktop with Intel Core i5-6400, laptop with Intel Core i3-1005G1) from
"5.14.21-150400.24.46-default" to "5.14.21-150400.24.49-default".
Download and install went OK, but after the restart, the PCs stopped booting
after GRUB having the new kernel selected and after showing the first initial
kernel message "x86/cpu: SGX disabled by BIOS"
There they hung hard, i.e. not reaction on keyboard, no blinking keyboard LEDs.
Both PC needed to be turned off and on again to restart, where the same problem
occurred again.
Both PCs could then be restarted again with no error using the previous kernel
"5.14.21-150400.24.46-default".

Reproducible: Always

Steps to Reproduce:
1.Install kernel 5.14.21-150400.24.49-default using YaST Online Update
2.Reboot PC
3.Select kernel 5.14.21-150400.24.49-default in GRUB
4.Boot selected kernel 5.14.21-150400.24.49-default
Actual Results:  
PC hangs after first kernel message on screen
Keyboard "dead": No keyboard LEDs (NumLock), no LEDs blinking

Expected Results:  
PC should have booted successfully using kernel 5.14.21-150400.24.49-default

Happend on 2 different PCs (older desktop, laptop)
Happens everytime
PC is "dead" and needs power off/on to restart -> Ctrl-Alt-Del is not working