Security advisory

{
  "id": "64d3db75ccc9511a739299e0c91043309bef492c0ebd83f43a4c39925fbbec89",
  "url": "https://osv.dev/vulnerability/CVE-2021-32846",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-32846",
    "summary": "HyperKit is a toolkit for embedding hypervisor capabilities in an application. In versions 0.20210107, function `pci_vtsock_proc_tx` in `virtio-sock` can lead to to uninitialized memory use. In this situation, there is a check for the return value to be less or equal to `VTSOCK_MAXSEGS`, but that check is not sufficient because the function can return `-1` if it finds an error it cannot recover from. Moreover, the negative return value will be used by `iovec_pull` in a while condition that can further lead to more corruption because the function is not designed to handle a negative `iov_len`. This issue may lead to a guest crashing the host causing a denial of service and, under certain circumstance, memory corruption. This issue is fixed in commit af5eba2360a7351c08dfd9767d9be863a50ebaba.",
    "evidence": "osv:CVE-2021-32846",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2021-32846",
      "aliases": [
        "CVE-2021-32846"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/moby/hyperkit",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "40cbd5caa9580e2b6de8fef53f4581943c430312"
                },
                {
                  "fixed": "af5eba2360a7351c08dfd9767d9be863a50ebaba"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:mobyproject:hyperkit:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "0.20210107"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "af5eba2360a7351c08dfd9767d9be863a50ebaba"
                      }
                    ],
                    "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-2021-32846.json",
            "vanir_signatures": [
              {
                "id": "CVE-2021-32846-b09d9f98",
                "digest": {
                  "length": 5340,
                  "function_hash": "125994073580106480435013042924630844270"
                },
                "source": "https://github.com/moby/hyperkit/commit/af5eba2360a7351c08dfd9767d9be863a50ebaba",
                "target": {
                  "file": "src/lib/pci_virtio_sock.c",
                  "function": "pci_vtsock_proc_tx"
                },
                "deprecated": false,
                "signature_type": "Function",
                "signature_version": "v1"
              },
              {
                "id": "CVE-2021-32846-eb6585cd",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
                    "118801894192246387531295740415707816522",
                    "210678114142392592887100980302801274153",
                    "216889802229094579609416855703020175875",
                    "303809023214414299997951559145263804521"
                  ]
                },
                "source": "https://github.com/moby/hyperkit/commit/af5eba2360a7351c08dfd9767d9be863a50ebaba",
                "target": {
                  "file": "src/lib/pci_virtio_sock.c"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              }
            ],
            "vanir_signatures_modified": "2026-10-20T14:05:11Z"
          }
        }
      ],
      "modified": "2026-10-20T14:05:11.527066670Z",
      "provider": "osv",
      "references": [
        "https://securitylab.github.com/advisories/GHSL-2021-054_057-moby-hyperkit/",
        "https://github.com/moby/hyperkit/commit/af5eba2360a7351c08dfd9767d9be863a50ebaba",
        "https://github.com/moby/hyperkit/pull/313"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-32846",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 388543,
  "published_at": "2023-02-17T23:15:12.037+00:00"
}