{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "0.20210107"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "40cbd5caa9580e2b6de8fef53f4581943c430312"
            },
            {
              "fixed": "af5eba2360a7351c08dfd9767d9be863a50ebaba"
            }
          ],
          "repo": "https://github.com/moby/hyperkit",
          "type": "GIT"
        }
      ]
    }
  ],
  "details": "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.",
  "id": "CVE-2021-32846",
  "modified": "2026-03-14T13:46:34.679407846Z",
  "published": "2023-02-17T23:15:12.037Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://securitylab.github.com/advisories/GHSL-2021-054_057-moby-hyperkit/"
    },
    {
      "type": "FIX",
      "url": "https://github.com/moby/hyperkit/commit/af5eba2360a7351c08dfd9767d9be863a50ebaba"
    },
    {
      "type": "FIX",
      "url": "https://github.com/moby/hyperkit/pull/313"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}