Reachable assertion in illumos bhyve REP string instruction emulation allows guest to panic host

{
                    "vendor": "illumos",
                    "product": "illumos-gate",
                    "platforms": [
                        "x86"
                    ],
                    "collectionURL": "https://illumos.org",
                    "packageName": "system/bhyve",
                    "repo": "https://github.com/illumos/illumos-gate",
                    "modules": [
                        "kernel",
                        "bhyve",
                        "vmm"
                    ],
                    "programFiles": [
                        "usr/src/uts/intel/io/vmm/vmm_instruction_emul.c"
                    ],
                    "versions": [
                        {
                            "status": "affected",
                            "version": "e0c0d44e917080841514d0dd031a696c74e8c435",
                            "lessThan": "696ecf8debceed9dc33937d8c8e111e4aeebfdae",
                            "changes": [
                                {
                                    "at": "696ecf8debceed9dc33937d8c8e111e4aeebfdae",
                                    "status": "unaffected"
                                }
                            ],
                            "versionType": "git"
                        }
                    ],
                    "defaultStatus": "affected"
                }

{
                    "vendor": "OmniOS",
                    "product": "OmniOS",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "any",
                            "lessThan": "r151054",
                            "versionType": "custom"
                        },
                        {
                            "status": "affected",
                            "version": "r151058",
                            "lessThan": "r151058w",
                            "changes": [
                                {
                                    "at": "r151058w",
                                    "status": "unaffected"
                                }
                            ],
                            "versionType": "custom"
                        },
                        {
                            "status": "affected",
                            "version": "r151056",
                            "lessThan": "r151056aw",
                            "changes": [
                                {
                                    "at": "r151056aw",
                                    "status": "unaffected"
                                }
                            ],
                            "versionType": "custom"
                        },
                        {
                            "status": "affected",
                            "version": "r151054",
                            "lessThan": "r151054bw",
                            "changes": [
                                {
                                    "at": "r151054bw",
                                    "status": "unaffected"
                                }
                            ],
                            "versionType": "custom"
                        }
                    ],
                    "defaultStatus": "affected"
                }