CVE-2026-102699 (GCVE-0-2026-102699)

Vulnerability from cvelistv5 – Published: 2026-10-13 15:45 – Updated: 2026-10-13 15:45
VLAI
Title
Arm: multiple issues with GNTTABOP_cache_flush
Summary
[This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] 1) XSA-437 (CVE-2023-34321) addressed issues with overflows in calculations involved in guests flushing caches through GNTTABOP_cache_flush. Unfortunately the fix there introduced a calculation which may underflow, resulting in a loop which would - at least on 64-bit Arm - take excessively long, and which would likely eventually crash the hypervisor. This is CVE-2026-102699. 2) GNTTABOP_cache_flush may be issued on memory mapped from another domain using the grant table interface. However there was no restriction to disallow the use of invalidate-without-clean against read-only grant mappings, which may corrupt the granted memory. This is CVE-2026-102702.
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
Impacted products
Vendor Product Version CPE status
Xen Xen Unknown: consult Xen advisory XSA-519
guessed Create a notification for this product.
Date Public
2026-10-13 12:00
Credits
CVE-2026-102699 was discovered by Leonid Komarianskyi of EPAM. It was later independently reported by Ayan Kumar Halder of AMD. CVE-2026-102702 was found by the security team while looking at the surrounding code.
Show details on NVD website
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unknown",
          "product": "Xen",
          "vendor": "Xen",
          "versions": [
            {
              "status": "unknown",
              "version": "consult Xen advisory XSA-519"
            }
          ]
        }
      ],
      "configurations": [
        {
          "lang": "en",
          "value": "All Xen versions from 4.5 onwards are vulnerable.  Xen versions 4.4 and\nearlier are not vulnerable.\n\nOnly Arm systems are vulnerable.  x86 systems are not vulnerable."
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "CVE-2026-102699 was discovered by Leonid Komarianskyi of EPAM.  It was\nlater independently reported by Ayan Kumar Halder of AMD.\n\nCVE-2026-102702 was found by the security team while looking at the\nsurrounding code."
        }
      ],
      "datePublic": "2026-10-13T12:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "[This CNA information record relates to multiple CVEs; the\ntext explains which aspects/vulnerabilities correspond to which CVE.]\n\n1) XSA-437 (CVE-2023-34321) addressed issues with overflows in\n   calculations involved in guests flushing caches through\n   GNTTABOP_cache_flush.  Unfortunately the fix there introduced a\n   calculation which may underflow, resulting in a loop which would - at\n   least on 64-bit Arm - take excessively long, and which would likely\n   eventually crash the hypervisor.\n\n   This is CVE-2026-102699.\n\n2) GNTTABOP_cache_flush may be issued on memory mapped from another\n   domain using the grant table interface.  However there was no\n   restriction to disallow the use of invalidate-without-clean against\n   read-only grant mappings, which may corrupt the granted memory.\n\n   This is CVE-2026-102702."
        }
      ],
      "impacts": [
        {
          "descriptions": [
            {
              "lang": "en",
              "value": "A malicious unprivileged guest may crash the hypervisor, causing a\nDenial of Service (DoS) affecting the entire host, or corrupt memory\nbelonging to another domain.  Privilege escalation and information leaks\ncannot be ruled out."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-13T15:45:13.073Z",
        "orgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
        "shortName": "XEN"
      },
      "references": [
        {
          "url": "https://xenbits.xenproject.org/xsa/advisory-519.html"
        }
      ],
      "title": "Arm: multiple issues with GNTTABOP_cache_flush",
      "workarounds": [
        {
          "lang": "en",
          "value": "There is no known mitigation."
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
    "assignerShortName": "XEN",
    "cveId": "CVE-2026-102699",
    "datePublished": "2026-10-13T15:45:13.073Z",
    "dateReserved": "2026-09-29T16:11:40.973Z",
    "dateUpdated": "2026-10-13T15:45:13.073Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-102699",
      "date": "2026-10-14",
      "epss": "0.00146",
      "percentile": "0.0347"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unknown",
                "product": "Xen",
                "vendor": "Xen",
                "versions": [
                  {
                    "status": "unknown",
                    "version": "consult Xen advisory XSA-519"
                  }
                ]
              }
            ],
            "source": "security@xen.org"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "[This CNA information record relates to multiple CVEs; the\ntext explains which aspects/vulnerabilities correspond to which CVE.]\n\n1) XSA-437 (CVE-2023-34321) addressed issues with overflows in\n   calculations involved in guests flushing caches through\n   GNTTABOP_cache_flush.  Unfortunately the fix there introduced a\n   calculation which may underflow, resulting in a loop which would - at\n   least on 64-bit Arm - take excessively long, and which would likely\n   eventually crash the hypervisor.\n\n   This is CVE-2026-102699.\n\n2) GNTTABOP_cache_flush may be issued on memory mapped from another\n   domain using the grant table interface.  However there was no\n   restriction to disallow the use of invalidate-without-clean against\n   read-only grant mappings, which may corrupt the granted memory.\n\n   This is CVE-2026-102702."
          }
        ],
        "id": "CVE-2026-102699",
        "lastModified": "2026-10-13T16:17:09.510",
        "metrics": {},
        "published": "2026-10-13T16:17:09.510",
        "references": [
          {
            "source": "security@xen.org",
            "url": "https://xenbits.xenproject.org/xsa/advisory-519.html"
          }
        ],
        "sourceIdentifier": "security@xen.org",
        "vulnStatus": "Received"
      }
    }
  }
}



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