FKIE_CVE-2021-28698

Vulnerability from fkie_nvd - Published: 2021-08-27 19:15 - Updated: 2024-11-21 06:00
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
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. In the process of carrying out certain actions, Xen would iterate over all such entries, including ones which aren't in use anymore and some which may have been created but never used. If the number of entries for a given domain is large enough, this iterating of the entire table may tie up a CPU for too long, starving other domains or causing issues in the hypervisor itself. Note that a domain may map its own grants, i.e. there is no need for multiple domains to be involved here. A pair of "cooperating" guests may, however, cause the effects to be more severe.
References
security@xen.orghttp://www.openwall.com/lists/oss-security/2021/09/01/2Mailing List, Third Party Advisory
security@xen.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2VQCFAPBNGBBAOMJZG6QBREOG5IIDZID/
security@xen.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FZCNPSRPGFCQRYE2BI4D4Q4SCE56ANV2/
security@xen.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LPRVHW4J4ZCPPOHZEWP5MOJT7XDGFFPJ/
security@xen.orghttps://security.gentoo.org/glsa/202208-23Third Party Advisory
security@xen.orghttps://www.debian.org/security/2021/dsa-4977Third Party Advisory
security@xen.orghttps://xenbits.xenproject.org/xsa/advisory-380.txtVendor Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2021/09/01/2Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2VQCFAPBNGBBAOMJZG6QBREOG5IIDZID/
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FZCNPSRPGFCQRYE2BI4D4Q4SCE56ANV2/
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LPRVHW4J4ZCPPOHZEWP5MOJT7XDGFFPJ/
af854a3a-2127-422b-91ae-364da2661108https://security.gentoo.org/glsa/202208-23Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.debian.org/security/2021/dsa-4977Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://xenbits.xenproject.org/xsa/advisory-380.txtVendor Advisory
Impacted products
Vendor Product Version
xen xen *
fedoraproject fedora 33
fedoraproject fedora 34
fedoraproject fedora 35
debian debian_linux 11.0
To clipboard 

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    {
      "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. In the process of carrying out certain actions, Xen would iterate over all such entries, including ones which aren\u0027t in use anymore and some which may have been created but never used. If the number of entries for a given domain is large enough, this iterating of the entire table may tie up a CPU for too long, starving other domains or causing issues in the hypervisor itself. Note that a domain may map its own grants, i.e. there is no need for multiple domains to be involved here. A pair of \"cooperating\" guests may, however, cause the effects to be more severe."
    },
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      "lang": "es",
      "value": "bucles de larga duraci\u00f3n en el manejo de la tabla de concesiones. Con el fin de supervisar adecuadamente el uso de los recursos, Xen mantiene inmaneraci\u00f3n sobre las asignaciones de concesiones que un dominio puede crear para asignar concesiones ofrecidas por otros dominios. 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. Un par de hu\u00e9spedes \"cooperantes\" pueden, sin embargo, causar que los efectos sean m\u00e1s severos."
    }
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  "id": "CVE-2021-28698",
  "lastModified": "2024-11-21T06:00:10.083",
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        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "LOCAL",
          "authentication": "NONE",
          "availabilityImpact": "COMPLETE",
          "baseScore": 4.9,
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "vectorString": "AV:L/AC:L/Au:N/C:N/I:N/A:C",
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          "baseScore": 5.5,
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  "published": "2021-08-27T19:15:07.757",
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}


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