Vulnerability-Lookup

FKIE_CVE-2026-102700

Vulnerability from fkie_nvd - Published: 2026-10-13 16:17 - Updated: 2026-10-14 16:10

Severity

Summary

With its original introduction, GNTTAB_cache_flush was made available uniformly. XSA-232 (CVE-2017-14318) then covered an omitted NULL pointer check, yet the addition of that check failed to adjust the subsequent error path. That error path fails to drop a page reference in case the specified page is owned by a special system domain (DOM_IO and DOM_COW are system domains which can have memory pages assigned to them.)

References

	URL	Tags
	security@xen.org	https://xenbits.xenproject.org/xsa/advisory-520.html
	af854a3a-2127-422b-91ae-364da2661108	http://xenbits.xen.org/xsa/advisory-520.html

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unknown",
          "product": "Xen",
          "vendor": "Xen",
          "versions": [
            {
              "status": "unknown",
              "version": "consult Xen advisory XSA-520"
            }
          ]
        }
      ],
      "source": "security@xen.org"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "With its original introduction, GNTTAB_cache_flush was made available\nuniformly.  XSA-232 (CVE-2017-14318) then covered an omitted NULL\npointer check, yet the addition of that check failed to adjust the\nsubsequent error path.  That error path fails to drop a page reference in\ncase the specified page is owned by a special system domain (DOM_IO and\nDOM_COW are system domains which can have memory pages assigned to them.)"
    }
  ],
  "id": "CVE-2026-102700",
  "lastModified": "2026-10-14T16:10:14.750",
  "metrics": {},
  "published": "2026-10-13T16:17:09.623",
  "references": [
    {
      "source": "security@xen.org",
      "url": "https://xenbits.xenproject.org/xsa/advisory-520.html"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://xenbits.xen.org/xsa/advisory-520.html"
    }
  ],
  "sourceIdentifier": "security@xen.org",
  "vulnStatus": "Awaiting Analysis"
}

CVE-2026-102700 (GCVE-0-2026-102700)

Vulnerability from cvelistv5 – Published: 2026-10-13 15:45 – Updated: 2026-10-13 16:11

Title

gnttab: cache-flush handling may cause page reference leak

Summary

Severity

No CVSS data available.

Assigner

XEN CNA under the mitre root

CNA scorecard D 56/100 over 46 records in the last 180 days details

References

2 references

URL	Tags
https://xenbits.xenproject.org/xsa/advisory-520.html
http://xenbits.xen.org/xsa/advisory-520.html

Impacted products

1 product

Vendor	Product	Version
Xen	Xen	Unknown: consult Xen advisory XSA-520

Date Public

2026-10-13 12:00

Credits

This issue was discovered independently by Andrew Cooper of Citrix and Yehyeong Lee.

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-10-13T16:11:54.099Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://xenbits.xen.org/xsa/advisory-520.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unknown",
          "product": "Xen",
          "vendor": "Xen",
          "versions": [
            {
              "status": "unknown",
              "version": "consult Xen advisory XSA-520"
            }
          ]
        }
      ],
      "configurations": [
        {
          "lang": "en",
          "value": "Xen versions 4.5 through 4.20 are affected.  Xen versions 4.21 and\nnewer as well as 4.4 and older are not affected.\n\nOnly x86 systems are vulnerable.  Arm systems are not vulnerable."
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "This issue was discovered independently by Andrew Cooper of Citrix and\nYehyeong Lee."
        }
      ],
      "datePublic": "2026-10-13T12:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "With its original introduction, GNTTAB_cache_flush was made available\nuniformly.  XSA-232 (CVE-2017-14318) then covered an omitted NULL\npointer check, yet the addition of that check failed to adjust the\nsubsequent error path.  That error path fails to drop a page reference in\ncase the specified page is owned by a special system domain (DOM_IO and\nDOM_COW are system domains which can have memory pages assigned to them.)"
        }
      ],
      "impacts": [
        {
          "descriptions": [
            {
              "lang": "en",
              "value": "The most likely outcome is Denial of Service (DoS) of either Domain 0\n(then likely affecting the entire host) or of another domain."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-13T15:45:27.794Z",
        "orgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
        "shortName": "XEN"
      },
      "references": [
        {
          "url": "https://xenbits.xenproject.org/xsa/advisory-520.html"
        }
      ],
      "title": "gnttab: cache-flush handling may cause page reference leak",
      "workarounds": [
        {
          "lang": "en",
          "value": "There is no known mitigation."
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
    "assignerShortName": "XEN",
    "cveId": "CVE-2026-102700",
    "datePublished": "2026-10-13T15:45:27.794Z",
    "dateReserved": "2026-09-29T16:11:40.973Z",
    "dateUpdated": "2026-10-13T16:11:54.099Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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