I've filed a bug on previous versions but it appears to have disappeared from the system, at least I can not find it with the search tool.

Using gcc 12.1, 5.18.0 through 5.18.4 fails to compile all with this same error in the kvm section:

 dpkg-source --before-build .
 debian/rules binary
In function ‘reg_read’,
    inlined from ‘reg_rmw’ at arch/x86/kvm/emulate.c:266:2:
arch/x86/kvm/emulate.c:254:27: error: array subscript 32 is above array bounds of ‘long unsigned int[17]’ [-Werror=array-bounds]
  254 |         return ctxt->_regs[nr];
      |                ~~~~~~~~~~~^~~~
In file included from arch/x86/kvm/emulate.c:23:
arch/x86/kvm/kvm_emulate.h: In function ‘reg_rmw’:
arch/x86/kvm/kvm_emulate.h:366:23: note: while referencing ‘_regs’
  366 |         unsigned long _regs[NR_VCPU_REGS];
      |                       ^~~~~
cc1: all warnings being treated as errors
make[5]: *** [scripts/Makefile.build:288: arch/x86/kvm/emulate.o] Error 1
make[4]: *** [scripts/Makefile.build:550: arch/x86/kvm] Error 2
make[3]: *** [Makefile:1834: arch/x86] Error 2
make[2]: *** [debian/rules:7: build-arch] Error 2
dpkg-buildpackage: error: debian/rules binary subprocess returned exit status 2
make[1]: *** [scripts/Makefile.package:83: bindeb-pkg] Error 2
make: *** [Makefile:1542: bindeb-pkg] Error 2