Security advisory

{
  "id": "bbee2f0e357713fc00cf9dbed2c9606c4c0714e11390790f09a9c9692a0bf13d",
  "url": "https://osv.dev/vulnerability/CVE-2021-32847",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-32847",
    "summary": "HyperKit is a toolkit for embedding hypervisor capabilities in an application. In versions 0.20210107 and prior, a malicious guest can trigger a vulnerability in the host by abusing the disk driver that may lead to the disclosure of the host memory into the virtualized guest. This issue is fixed in commit cf60095a4d8c3cb2e182a14415467afd356e982f.",
    "evidence": "osv:CVE-2021-32847",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-32847",
      "aliases": [
        "CVE-2021-32847"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/moby/hyperkit",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "40cbd5caa9580e2b6de8fef53f4581943c430312"
                },
                {
                  "fixed": "cf60095a4d8c3cb2e182a14415467afd356e982f"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:mobyproject:hyperkit:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "0.20210107"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "cf60095a4d8c3cb2e182a14415467afd356e982f"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.20210107",
            "v0.20200908",
            "v0.20200224",
            "v0.20190802",
            "v0.20190201",
            "v0.20180621",
            "v0.20171204",
            "v0.20171020",
            "v0.20170904",
            "v0.20170519",
            "v0.20170511",
            "v0.20170425",
            "v0.20170227",
            "v0.20170214"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-32847.json",
            "vanir_signatures": [
              {
                "id": "CVE-2021-32847-33a2ab3c",
                "digest": {
                  "length": 2203,
                  "function_hash": "211594263407013010728782976838174057249"
                },
                "source": "https://github.com/moby/hyperkit/commit/cf60095a4d8c3cb2e182a14415467afd356e982f",
                "target": {
                  "file": "src/lib/pci_virtio_block.c",
                  "function": "pci_vtblk_proc"
                },
                "deprecated": false,
                "signature_type": "Function",
                "signature_version": "v1"
              },
              {
                "id": "CVE-2021-32847-ae3a0f92",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
                    "66336624619954675223392690425040697295",
                    "9047546862656464640058411706248649179",
                    "10498610056149185165050029727385673571",
                    "85107401001624865239215709652180088083"
                  ]
                },
                "source": "https://github.com/moby/hyperkit/commit/cf60095a4d8c3cb2e182a14415467afd356e982f",
                "target": {
                  "file": "src/lib/pci_virtio_block.c"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              }
            ],
            "vanir_signatures_modified": "2026-10-20T14:05:12Z"
          }
        }
      ],
      "modified": "2026-10-20T14:05:12.354931162Z",
      "provider": "osv",
      "references": [
        "https://github.com/moby/hyperkit/commit/cf60095a4d8c3cb2e182a14415467afd356e982f",
        "https://github.com/moby/hyperkit/blob/2f061e447e1435cdf1b9eda364cea6414f2c606b/src/lib/pci_virtio_block.c#L316",
        "https://securitylab.github.com/advisories/GHSL-2021-058-moby-hyperkit/"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-32847",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 388542,
  "published_at": "2023-02-20T17:15:11.857+00:00"
}