{"containers": {"cna": {"affected": [{"product": "xen", "vendor": "Xen", "versions": [{"status": "affected", "version": "4.14.x"}]}, {"product": "xen", "vendor": "Xen", "versions": [{"lessThan": "4.12", "status": "unknown", "version": "unspecified", "versionType": "custom"}, {"lessThan": "unspecified", "status": "affected", "version": "4.15.x", "versionType": "custom"}, {"lessThan": "unspecified", "status": "unaffected", "version": "next of xen-unstable", "versionType": "custom"}]}, {"product": "xen", "vendor": "Xen", "versions": [{"status": "affected", "version": "4.13.x"}]}, {"product": "xen", "vendor": "Xen", "versions": [{"status": "affected", "version": "4.11.x"}]}, {"product": "xen", "vendor": "Xen", "versions": [{"status": "affected", "version": "4.12.x"}]}], "credits": [{"lang": "en", "value": "{'credit_data': {'description': {'description_data': [{'lang': 'eng', 'value': 'This issue was discovered by Andrew Cooper of Citrix.'}]}}}"}], "descriptions": [{"lang": "en", "value": "long running loops in grant table handling In order to properly monitor resource use, Xen maintains information on the grant mappings a domain may create to map grants offered by other domains. 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A pair of \"cooperating\" guests may, however, cause the effects to be more severe."}], "metrics": [{"other": {"content": {"description": {"description_data": [{"lang": "eng", "value": "Malicious or buggy guest kernels may be able to mount a Denial of\nService (DoS) attack affecting the entire system."}]}}, "type": "unknown"}}], "problemTypes": [{"descriptions": [{"description": "unknown", "lang": "en", "type": "text"}]}], "providerMetadata": {"dateUpdated": "2022-08-14T20:06:44", "orgId": "23aa2041-22e1-471f-9209-9b7396fa234f", "shortName": "XEN"}, "references": [{"tags": ["x_refsource_MISC"], "url": "https://xenbits.xenproject.org/xsa/advisory-380.txt"}, {"name": "[oss-security] 20210901 Xen Security Advisory 380 v3 (CVE-2021-28698) - long running loops in grant table handling", "tags": ["mailing-list", "x_refsource_MLIST"], "url": "http://www.openwall.com/lists/oss-security/2021/09/01/2"}, {"name": "FEDORA-2021-4f129cc0c1", "tags": ["vendor-advisory", "x_refsource_FEDORA"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LPRVHW4J4ZCPPOHZEWP5MOJT7XDGFFPJ/"}, {"name": "FEDORA-2021-d68ed12e46", "tags": ["vendor-advisory", "x_refsource_FEDORA"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FZCNPSRPGFCQRYE2BI4D4Q4SCE56ANV2/"}, {"name": "DSA-4977", "tags": ["vendor-advisory", "x_refsource_DEBIAN"], "url": "https://www.debian.org/security/2021/dsa-4977"}, {"name": "FEDORA-2021-081f9bf5d2", "tags": ["vendor-advisory", "x_refsource_FEDORA"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2VQCFAPBNGBBAOMJZG6QBREOG5IIDZID/"}, {"name": "GLSA-202208-23", "tags": ["vendor-advisory", "x_refsource_GENTOO"], "url": "https://security.gentoo.org/glsa/202208-23"}], "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "security@xen.org", "ID": "CVE-2021-28698", "STATE": "PUBLIC"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "xen", "version": {"version_data": [{"version_value": "4.14.x"}]}}, {"product_name": "xen", "version": {"version_data": [{"version_affected": "?<", "version_value": "4.12"}, {"version_affected": ">=", "version_value": "4.15.x"}, {"version_affected": "!>", "version_value": "xen-unstable"}]}}, {"product_name": "xen", "version": {"version_data": [{"version_value": "4.13.x"}]}}, {"product_name": "xen", "version": {"version_data": [{"version_value": "4.11.x"}]}}, {"product_name": "xen", "version": {"version_data": [{"version_value": "4.12.x"}]}}]}, "vendor_name": "Xen"}]}}, "configuration": {"configuration_data": {"description": {"description_data": [{"lang": "eng", "value": "All Xen versions from at least 3.2 onwards are vulnerable in principle.\n\nSystems running with default settings are generally believed to not be\nvulnerable."}]}}}, "credit": {"credit_data": {"description": {"description_data": [{"lang": "eng", "value": "This issue was discovered by Andrew Cooper of Citrix."}]}}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "long running loops in grant table handling In order to properly monitor resource use, Xen maintains information on the grant mappings a domain may create to map grants offered by other domains. 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A pair of \"cooperating\" guests may, however, cause the effects to be more severe."}]}, "impact": {"impact_data": {"description": {"description_data": [{"lang": "eng", "value": "Malicious or buggy guest kernels may be able to mount a Denial of\nService (DoS) attack affecting the entire system."}]}}}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "unknown"}]}]}, "references": {"reference_data": [{"name": "https://xenbits.xenproject.org/xsa/advisory-380.txt", "refsource": "MISC", "url": "https://xenbits.xenproject.org/xsa/advisory-380.txt"}, {"name": "[oss-security] 20210901 Xen Security Advisory 380 v3 (CVE-2021-28698) - long running loops in grant table handling", "refsource": "MLIST", "url": "http://www.openwall.com/lists/oss-security/2021/09/01/2"}, {"name": "FEDORA-2021-4f129cc0c1", "refsource": "FEDORA", "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LPRVHW4J4ZCPPOHZEWP5MOJT7XDGFFPJ/"}, {"name": "FEDORA-2021-d68ed12e46", "refsource": "FEDORA", "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FZCNPSRPGFCQRYE2BI4D4Q4SCE56ANV2/"}, {"name": "DSA-4977", "refsource": "DEBIAN", "url": "https://www.debian.org/security/2021/dsa-4977"}, {"name": "FEDORA-2021-081f9bf5d2", "refsource": "FEDORA", "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2VQCFAPBNGBBAOMJZG6QBREOG5IIDZID/"}, {"name": "GLSA-202208-23", "refsource": "GENTOO", "url": "https://security.gentoo.org/glsa/202208-23"}]}, "workaround": {"workaround_data": {"description": {"description_data": [{"lang": "eng", "value": "The problem can be avoided by reducing the number of grant mappings Xen\nwould allow guests to establish. For example, setting\n\"gnttab_max_maptrack_frames=256\" on the Xen command line (available\nfrom Xen 4.5 onwards) or \"max_maptrack_frames=256\" in the xl domain\nconfigurations (available from Xen 4.10 onwards) may be low enough for\nall hardware Xen is able to run on. Note that except for driver\ndomains, guests don't normally have a need to establish grant mappings,\ni.e. they may be okay to run with \"max_maptrack_frames=0\" in their xl\ndomain configurations.\n\n- From Xen 4.14 onwards it is also possible to alter the system wide upper\nbound of the number of grant mappings Xen would allow guests to\nestablish by writing to the /params/gnttab_max_maptrack_frames\nhypervisor file system node. Note however that changing the value this\nway will only affect guests yet to be created on the respective host."}]}}}}}}, "cveMetadata": {"assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f", "assignerShortName": "XEN", "cveId": "CVE-2021-28698", "datePublished": "2021-08-27T18:32:13", "dateReserved": "2021-03-18T00:00:00", "dateUpdated": "2022-08-14T20:06:44", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.0"}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:*", "matchCriteriaId": "70FF936F-CF3F-4124-AF44-DAFE2D227F11", "versionStartIncluding": "3.2.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*", "matchCriteriaId": "E460AA51-FCDA-46B9-AE97-E6676AA5E194", "vulnerable": true}, {"criteria": "cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*", "matchCriteriaId": "A930E247-0B43-43CB-98FF-6CE7B8189835", "vulnerable": true}, {"criteria": "cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*", "matchCriteriaId": "80E516C0-98A4-4ADE-B69F-66A772E2BAAA", "vulnerable": true}], "negate": false, "operator": "OR"}]}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*", "matchCriteriaId": "FA6FEEC2-9F11-4643-8827-749718254FED", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "descriptions": [{"lang": "en", "value": "long running loops in grant table handling In order to properly monitor resource use, Xen maintains information on the grant mappings a domain may create to map grants offered by other domains. 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En el proceso de llevar a cabo determinadas acciones, Xen iterar\u00eda sobre todas esas entradas, incluyendo las que ya no est\u00e1n en uso y algunas que pueden haber sido creadas pero nunca usadas. Si el n\u00famero de entradas para un dominio dado es lo suficientemente grande, esta iteraci\u00f3n de toda la tabla puede atar una CPU durante mucho tiempo, no alimentando otros dominios o causando problemas en el propio hypervisor. Tenga en cuenta que un dominio puede asignar sus propias concesiones, es decir, no es necesario que haya varios dominios involucrados aqu\u00ed. 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