Cloud Hypervisor: Use-after-free in virtio-block Async I/O Completion

{
  "id": "18fc218d7a50b69aa0e11ead40c8d31070622d25fb4ba5b4f1daf5bf30e82dd6",
  "url": "https://osv.dev/vulnerability/CVE-2026-45782",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Cloud Hypervisor: Use-after-free in virtio-block Async I/O Completion",
    "summary": "Cloud Hypervisor is a Virtual Machine Monitor for Cloud workloads. From version 21.0 to before version 51.2, a guest can cause a use-after-free in the cloud-hypervisor process by submitting two virtio-block descriptor chains that reuse the same head_index while asynchronous block I/O is enabled (e.g. io_uring, aio). When the kernel completes the duplicate operation before the original, the completion path frees a bounce buffer that the kernel is still actively reading from or writing to, corrupting the freed memory. This issue has been patched in versions 51.2 and 52.0.",
    "evidence": "osv:CVE-2026-45782",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-45782",
      "aliases": [
        "CVE-2026-45782",
        "GHSA-f47p-p25q-83rh"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/cloud-hypervisor/cloud-hypervisor",
              "type": "GIT",
              "events": [
                {
                  "introduced": "95ca79974a32f3dab5987032361d0ecd2aa65512"
                },
                {
                  "fixed": "aa208c147e3f975830d5afc0e95edcc18dc34f6a"
                },
                {
                  "fixed": "1314ac883c641f1045bbb06dec0de045a3894baa"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "21.0"
                      },
                      {
                        "fixed": "51.2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "1314ac883c641f1045bbb06dec0de045a3894baa"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "aa208c147e3f975830d5afc0e95edcc18dc34f6a"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v51.2"
                  },
                  {
                    "range": [
                      {
                        "fixed": "1314ac883c641f1045bbb06dec0de045a3894baa"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v52.0"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v51.1",
            "v51.0",
            "v50.0",
            "v49.0",
            "v48.0",
            "v47.0",
            "v46.0",
            "v45.0",
            "v44.0",
            "v43.0",
            "v42.0",
            "v41.0",
            "v40.0",
            "v39.0",
            "v37.0",
            "v38.0",
            "v35.0",
            "v36.0",
            "v34.0",
            "v32.0",
            "v33.0",
            "v30.0",
            "v31.0",
            "v29.0",
            "v28.0",
            "v27.0",
            "v26.0",
            "v25.0",
            "v24.0",
            "v23.0",
            "v22.0",
            "v21.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-45782.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:48.859972039Z",
      "provider": "osv",
      "references": [
        "https://github.com/cloud-hypervisor/cloud-hypervisor/releases/tag/v51.2",
        "https://github.com/cloud-hypervisor/cloud-hypervisor/releases/tag/v52.0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45782.json",
        "https://github.com/cloud-hypervisor/cloud-hypervisor/security/advisories/GHSA-f47p-p25q-83rh",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-45782",
        "https://github.com/cloud-hypervisor/cloud-hypervisor/commit/1314ac883c641f1045bbb06dec0de045a3894baa",
        "https://github.com/cloud-hypervisor/cloud-hypervisor/pull/8220"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-416"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45782.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-45782",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 517007,
  "published_at": "2026-06-09T22:53:52.657+00:00"
}