cvelist/2023/34xxx/CVE-2023-34322.json

{
    "data_version": "4.0",
    "data_type": "CVE",
    "data_format": "MITRE",
    "CVE_data_meta": {
        "ID": "CVE-2023-34322",
        "ASSIGNER": "security@xen.org",
        "STATE": "PUBLIC"
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "For migration as well as to work around kernels unaware of L1TF (see\nXSA-273), PV guests may be run in shadow paging mode.  Since Xen itself\nneeds to be mapped when PV guests run, Xen and shadowed PV guests run\ndirectly the respective shadow page tables.  For 64-bit PV guests this\nmeans running on the shadow of the guest root page table.\n\nIn the course of dealing with shortage of memory in the shadow pool\nassociated with a domain, shadows of page tables may be torn down.  This\ntearing down may include the shadow root page table that the CPU in\nquestion is presently running on.  While a precaution exists to\nsupposedly prevent the tearing down of the underlying live page table,\nthe time window covered by that precaution isn't large enough.\n"
            }
        ]
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "n/a"
                    }
                ]
            }
        ]
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "vendor_name": "Xen",
                    "product": {
                        "product_data": [
                            {
                                "product_name": "Xen",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_value": "not down converted",
                                            "x_cve_json_5_version_data": {
                                                "versions": [
                                                    {
                                                        "status": "unknown",
                                                        "version": "consult Xen advisory XSA-438"
                                                    }
                                                ],
                                                "defaultStatus": "unknown"
                                            }
                                        }
                                    ]
                                }
                            }
                        ]
                    }
                }
            ]
        }
    },
    "references": {
        "reference_data": [
            {
                "url": "https://xenbits.xenproject.org/xsa/advisory-438.html",
                "refsource": "MISC",
                "name": "https://xenbits.xenproject.org/xsa/advisory-438.html"
            }
        ]
    },
    "configuration": [
        {
            "lang": "en",
            "value": "All Xen versions from at least 3.2 onwards are vulnerable.  Earlier\nversions have not been inspected.\n\nOnly x86 systems are vulnerable.  Only 64-bit PV guests can leverage the\nvulnerability, and only when running in shadow mode.  Shadow mode would\nbe in use when migrating guests or as a workaround for XSA-273 (L1TF).\n"
        }
    ],
    "work_around": [
        {
            "lang": "en",
            "value": "Running only HVM or PVH guests will avoid the vulnerability.\n\nRunning PV guests in the PV shim will also avoid the vulnerability.\n"
        }
    ],
    "credits": [
        {
            "lang": "en",
            "value": "This issue was discovered by Tim Deegan, and Jan Beulich of SUSE.\n"
        }
    ]
}