{"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."}]}, "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."}]}}}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T21:47:33.154Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_MISC", "x_transferred"], "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", "x_transferred"], "url": "http://www.openwall.com/lists/oss-security/2021/09/01/2"}, {"name": "FEDORA-2021-4f129cc0c1", "tags": ["vendor-advisory", "x_refsource_FEDORA", "x_transferred"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LPRVHW4J4ZCPPOHZEWP5MOJT7XDGFFPJ/"}, {"name": "FEDORA-2021-d68ed12e46", "tags": ["vendor-advisory", "x_refsource_FEDORA", "x_transferred"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FZCNPSRPGFCQRYE2BI4D4Q4SCE56ANV2/"}, {"name": "DSA-4977", "tags": ["vendor-advisory", "x_refsource_DEBIAN", "x_transferred"], "url": "https://www.debian.org/security/2021/dsa-4977"}, {"name": "FEDORA-2021-081f9bf5d2", "tags": ["vendor-advisory", "x_refsource_FEDORA", "x_transferred"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2VQCFAPBNGBBAOMJZG6QBREOG5IIDZID/"}, {"name": "GLSA-202208-23", "tags": ["vendor-advisory", "x_refsource_GENTOO", "x_transferred"], "url": "https://security.gentoo.org/glsa/202208-23"}]}]}, "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": "2024-08-03T21:47:33.154Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

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