ovpn: ensure socket is owned by ovpn before deref sk_user_data

{
  "id": "db9b5c365e3574425119f780811a009de26fdc5006147e030e8dffb7d84cd12d",
  "url": "https://osv.dev/vulnerability/CVE-2026-80735",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ovpn: ensure socket is owned by ovpn before deref sk_user_data",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: ovpn: ensure socket is owned by ovpn before deref sk_user_data Some subsystems, like BPF SOCKMAP, set sk_user_data without actually setting the encap_type. For this reason, we must make sure that the type is the one ovpn expects before dereferencing sk_user_data. Failing to do so may lead to out-of-bounds reads.",
    "evidence": "osv:CVE-2026-80735",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.18.45",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.1.9",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-80735",
      "aliases": [
        "CVE-2026-80735"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "f6226ae7a0cd47aaa9175aca6a1e19600f884cbf"
                },
                {
                  "fixed": "61fb3cca40ff938671474f4a16adb908c19032d7"
                },
                {
                  "fixed": "43a31142e1d22b3cf5490bd94a94db7196901734"
                },
                {
                  "fixed": "59aed1eb60d70678a53acccb0cb337a26ce6680e"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80735.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.16.0"
                },
                {
                  "fixed": "6.18.45"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.1.9"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80735.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:32.430595510Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/43a31142e1d22b3cf5490bd94a94db7196901734",
        "https://git.kernel.org/stable/c/59aed1eb60d70678a53acccb0cb337a26ce6680e",
        "https://git.kernel.org/stable/c/61fb3cca40ff938671474f4a16adb908c19032d7",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80735.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-80735",
        "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/2026/80xxx/CVE-2026-80735.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-80735",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 499661,
  "published_at": "2026-09-03T08:21:51.344+00:00"
}