vhost: vringh: Fix copy_to_iter return value check

{
  "id": "8f3e66ec6f2017ca63e1553ae425d2bf09138dada233cd3a4e5eff969991ed4e",
  "url": "https://osv.dev/vulnerability/CVE-2025-40056",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "vhost: vringh: Fix copy_to_iter return value check",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: vhost: vringh: Fix copy_to_iter return value check The return value of copy_to_iter can't be negative, check whether the copied length is equal to the requested length instead of checking for negative values.",
    "evidence": "osv:CVE-2025-40056",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.1.156",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.112",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.53",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.17.3",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2025-40056",
      "aliases": [
        "CVE-2025-40056"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "309bba39c945ac8ab8083ac05cd6cfe5822968e0"
                },
                {
                  "fixed": "bd71e7e0a612740e4de5524880c7cd40293af5f7"
                },
                {
                  "fixed": "781226e11d5bdea0d69c7b5aa3cda874093c73b8"
                },
                {
                  "fixed": "b3a950d236e98440c07405ba597b11bce56a8050"
                },
                {
                  "fixed": "68aac2b335d474b938d154b9c95cbc58838cb2ce"
                },
                {
                  "fixed": "439263376c2c4e126cac0d07e4987568de4eaba5"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-40056.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.0.0"
                },
                {
                  "fixed": "6.1.156"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.112"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.53"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.17.3"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-40056.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:33.806333683Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/439263376c2c4e126cac0d07e4987568de4eaba5",
        "https://git.kernel.org/stable/c/68aac2b335d474b938d154b9c95cbc58838cb2ce",
        "https://git.kernel.org/stable/c/781226e11d5bdea0d69c7b5aa3cda874093c73b8",
        "https://git.kernel.org/stable/c/b3a950d236e98440c07405ba597b11bce56a8050",
        "https://git.kernel.org/stable/c/bd71e7e0a612740e4de5524880c7cd40293af5f7",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40056.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-40056",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40056.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-40056",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 501124,
  "published_at": "2025-10-28T11:48:30.249+00:00"
}