{
    "containers": {
        "cna": {
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "versions": [
                        {
                            "lessThan": "4.12",
                            "status": "unknown",
                            "version": "unspecified",
                            "versionType": "custom"
                        },
                        {
                            "lessThan": "unspecified",
                            "status": "affected",
                            "version": "5.5.0",
                            "versionType": "custom"
                        },
                        {
                            "lessThan": "unspecified",
                            "status": "unaffected",
                            "version": "next of 5.12.2",
                            "versionType": "custom"
                        }
                    ]
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "value": "{'credit_data': {'description': {'description_data': [{'lang': 'eng', 'value': 'This issue was discovered by Michael Brown of iPXE and diagnosed by\\nOlivier Benjamin, Michael Kurth and Martin Mazein of AWS.'}]}}}"
                }
            ],
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Guest triggered use-after-free in Linux xen-netback A malicious or buggy network PV frontend can force Linux netback to disable the interface and terminate the receive kernel thread associated with queue 0 in response to the frontend sending a malformed packet. Such kernel thread termination will lead to a use-after-free in Linux netback when the backend is destroyed, as the kernel thread associated with queue 0 will have already exited and thus the call to kthread_stop will be performed against a stale pointer."
                }
            ],
            "metrics": [
                {
                    "other": {
                        "content": {
                            "description": {
                                "description_data": [
                                    {
                                        "lang": "eng",
                                        "value": "A malicious or buggy frontend driver can trigger a dom0 crash.\nPrivilege escalation and information leaks cannot be ruled out."
                                    }
                                ]
                            }
                        },
                        "type": "unknown"
                    }
                }
            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "description": "unknown",
                            "lang": "en",
                            "type": "text"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "dateUpdated": "2021-08-05T11:07:09",
                "orgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
                "shortName": "XEN"
            },
            "references": [
                {
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://xenbits.xenproject.org/xsa/advisory-374.txt"
                },
                {
                    "name": "GLSA-202107-30",
                    "tags": [
                        "vendor-advisory",
                        "x_refsource_GENTOO"
                    ],
                    "url": "https://security.gentoo.org/glsa/202107-30"
                },
                {
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://security.netapp.com/advisory/ntap-20210805-0002/"
                }
            ],
            "x_legacyV4Record": {
                "CVE_data_meta": {
                    "ASSIGNER": "security@xen.org",
                    "ID": "CVE-2021-28691",
                    "STATE": "PUBLIC"
                },
                "affects": {
                    "vendor": {
                        "vendor_data": [
                            {
                                "product": {
                                    "product_data": [
                                        {
                                            "product_name": "Linux",
                                            "version": {
                                                "version_data": [
                                                    {
                                                        "version_affected": "?<",
                                                        "version_value": "4.12"
                                                    },
                                                    {
                                                        "version_affected": ">=",
                                                        "version_value": "5.5.0"
                                                    },
                                                    {
                                                        "version_affected": "!>",
                                                        "version_value": "5.12.2"
                                                    }
                                                ]
                                            }
                                        }
                                    ]
                                },
                                "vendor_name": "Linux"
                            }
                        ]
                    }
                },
                "configuration": {
                    "configuration_data": {
                        "description": {
                            "description_data": [
                                {
                                    "lang": "eng",
                                    "value": "Systems using Linux version 5.5 or newer are vulnerable."
                                }
                            ]
                        }
                    }
                },
                "credit": {
                    "credit_data": {
                        "description": {
                            "description_data": [
                                {
                                    "lang": "eng",
                                    "value": "This issue was discovered by Michael Brown of iPXE and diagnosed by\nOlivier Benjamin, Michael Kurth and Martin Mazein of AWS."
                                }
                            ]
                        }
                    }
                },
                "data_format": "MITRE",
                "data_type": "CVE",
                "data_version": "4.0",
                "description": {
                    "description_data": [
                        {
                            "lang": "eng",
                            "value": "Guest triggered use-after-free in Linux xen-netback A malicious or buggy network PV frontend can force Linux netback to disable the interface and terminate the receive kernel thread associated with queue 0 in response to the frontend sending a malformed packet. Such kernel thread termination will lead to a use-after-free in Linux netback when the backend is destroyed, as the kernel thread associated with queue 0 will have already exited and thus the call to kthread_stop will be performed against a stale pointer."
                        }
                    ]
                },
                "impact": {
                    "impact_data": {
                        "description": {
                            "description_data": [
                                {
                                    "lang": "eng",
                                    "value": "A malicious or buggy frontend driver can trigger a dom0 crash.\nPrivilege escalation and information leaks cannot be ruled out."
                                }
                            ]
                        }
                    }
                },
                "problemtype": {
                    "problemtype_data": [
                        {
                            "description": [
                                {
                                    "lang": "eng",
                                    "value": "unknown"
                                }
                            ]
                        }
                    ]
                },
                "references": {
                    "reference_data": [
                        {
                            "name": "https://xenbits.xenproject.org/xsa/advisory-374.txt",
                            "refsource": "MISC",
                            "url": "https://xenbits.xenproject.org/xsa/advisory-374.txt"
                        },
                        {
                            "name": "GLSA-202107-30",
                            "refsource": "GENTOO",
                            "url": "https://security.gentoo.org/glsa/202107-30"
                        },
                        {
                            "name": "https://security.netapp.com/advisory/ntap-20210805-0002/",
                            "refsource": "CONFIRM",
                            "url": "https://security.netapp.com/advisory/ntap-20210805-0002/"
                        }
                    ]
                },
                "workaround": {
                    "workaround_data": {
                        "description": {
                            "description_data": [
                                {
                                    "lang": "eng",
                                    "value": "On x86 running only HVM guests with emulated network cards will avoid the\nissue.  There's however no option in the upstream toolstack to offer only\nemulated network cards to guests."
                                }
                            ]
                        }
                    }
                }
            }
        },
        "adp": [
            {
                "providerMetadata": {
                    "orgId": "af854a3a-2127-422b-91ae-364da2661108",
                    "shortName": "CVE",
                    "dateUpdated": "2024-08-03T21:47:33.196Z"
                },
                "title": "CVE Program Container",
                "references": [
                    {
                        "tags": [
                            "x_refsource_MISC",
                            "x_transferred"
                        ],
                        "url": "https://xenbits.xenproject.org/xsa/advisory-374.txt"
                    },
                    {
                        "name": "GLSA-202107-30",
                        "tags": [
                            "vendor-advisory",
                            "x_refsource_GENTOO",
                            "x_transferred"
                        ],
                        "url": "https://security.gentoo.org/glsa/202107-30"
                    },
                    {
                        "tags": [
                            "x_refsource_CONFIRM",
                            "x_transferred"
                        ],
                        "url": "https://security.netapp.com/advisory/ntap-20210805-0002/"
                    }
                ]
            }
        ]
    },
    "cveMetadata": {
        "assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
        "assignerShortName": "XEN",
        "cveId": "CVE-2021-28691",
        "datePublished": "2021-06-29T11:30:53",
        "dateReserved": "2021-03-18T00:00:00",
        "dateUpdated": "2024-08-03T21:47:33.196Z",
        "state": "PUBLISHED"
    },
    "dataType": "CVE_RECORD",
    "dataVersion": "5.1"
}