github - ghsa-2g34-x978-mw32

ghsa-2g34-x978-mw32

Vulnerability from github

Published

2022-05-24 19:12

Modified

2022-08-16 00:00

Severity ?

5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2021-28698"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-835"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2021-08-27T19:15:00Z",
    "severity": "MODERATE"
  },
  "details": "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.",
  "id": "GHSA-2g34-x978-mw32",
  "modified": "2022-08-16T00:00:43Z",
  "published": "2022-05-24T19:12:22Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-28698"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2VQCFAPBNGBBAOMJZG6QBREOG5IIDZID"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FZCNPSRPGFCQRYE2BI4D4Q4SCE56ANV2"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LPRVHW4J4ZCPPOHZEWP5MOJT7XDGFFPJ"
    },
    {
      "type": "WEB",
      "url": "https://security.gentoo.org/glsa/202208-23"
    },
    {
      "type": "WEB",
      "url": "https://www.debian.org/security/2021/dsa-4977"
    },
    {
      "type": "WEB",
      "url": "https://xenbits.xenproject.org/xsa/advisory-380.txt"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2021/09/01/2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

cve-2021-28698

Vulnerability from cvelistv5

Published

2021-08-27 18:32

Modified

2024-08-03 21:47

Severity ?

Summary

References

▼	URL	Tags
	https://xenbits.xenproject.org/xsa/advisory-380.txt	x_refsource_MISC
	http://www.openwall.com/lists/oss-security/2021/09/01/2	mailing-list, x_refsource_MLIST
	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LPRVHW4J4ZCPPOHZEWP5MOJT7XDGFFPJ/	vendor-advisory, x_refsource_FEDORA
	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FZCNPSRPGFCQRYE2BI4D4Q4SCE56ANV2/	vendor-advisory, x_refsource_FEDORA
	https://www.debian.org/security/2021/dsa-4977	vendor-advisory, x_refsource_DEBIAN
	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2VQCFAPBNGBBAOMJZG6QBREOG5IIDZID/	vendor-advisory, x_refsource_FEDORA
	https://security.gentoo.org/glsa/202208-23	vendor-advisory, x_refsource_GENTOO

Impacted products

▼	Vendor	Product
	Xen	xen
	Xen	xen
	Xen	xen
	Xen	xen
	Xen	xen

Show details on NVD website

JSON

To clipboard

{
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        "dateUpdated": "2022-08-14T20:06:44",
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        {
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            }
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                }
              ]
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              "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"
            },
            {
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              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LPRVHW4J4ZCPPOHZEWP5MOJT7XDGFFPJ/"
            },
            {
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              "refsource": "FEDORA",
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FZCNPSRPGFCQRYE2BI4D4Q4SCE56ANV2/"
            },
            {
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              "refsource": "DEBIAN",
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            },
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              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2VQCFAPBNGBBAOMJZG6QBREOG5IIDZID/"
            },
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              "url": "https://security.gentoo.org/glsa/202208-23"
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          ]
        },
        "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\u0027t 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."
                }
              ]
            }
          }
        }
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    }
  },
  "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"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

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