CVE-2024-55881 KVM: x86: Play nice with protected guests in complete_hypercall_exit()

In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Play nice with protected guests in completehypercallexit Use is64bithypercall instead of is64bitmode to detect a 64-bit hypercall when completing said hypercall. For guests with protected state, e.g. SEV-ES and SEV-SNP,...

DEBIAN-CVE-2023-46842

Unlike 32-bit PV guests, HVM guests may switch freely between 64-bit and other modes. This in particular means that they may set registers used to pass 32-bit-mode hypercall arguments to values outside of the range 32-bit code would be able to set them to. When processing of hypercalls takes a...