{ "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": "2021-08-05T11:07:09.000Z", "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": "2021-06-29T11:30:53.000Z", "dateReserved": "2021-03-18T00:00:00.000Z", "dateUpdated": "2024-08-03T21:47:33.196Z", "state": "PUBLISHED" }, "dataType": "CVE_RECORD", "dataVersion": "5.1" }