xfrm: iptfs: only publish mode_data after clone setup

{
  "id": "58b219baeda36665682b0f948a9f13c69f6f91d0f0075cf74edb90a09181427b",
  "url": "https://osv.dev/vulnerability/CVE-2026-31471",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "xfrm: iptfs: only publish mode_data after clone setup",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: xfrm: iptfs: only publish mode_data after clone setup iptfs_clone_state() stores x->mode_data before allocating the reorder window. If that allocation fails, the code frees the cloned state and returns -ENOMEM, leaving x->mode_data pointing at freed memory. The xfrm clone unwind later runs destroy_state() through x->mode_data, so the failed clone path tears down IPTFS state that clone_state() already freed. Keep the cloned IPTFS state private until all allocations succeed so failed clones leave x->mode_data unset. The destroy path already handles a NULL mode_data pointer.",
    "evidence": "osv:CVE-2026-31471",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.18.21",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.19.11",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-31471",
      "aliases": [
        "CVE-2026-31471"
      ],
      "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://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "6be02e3e4f376fea468846c8562655ca5ee18204"
                },
                {
                  "fixed": "371a43c4ac70cac0de9f9b1fc5b1660b9565b9f1"
                },
                {
                  "fixed": "5784a1e2889c9525a8f036cb586930e232170bf7"
                },
                {
                  "fixed": "d849a2f7309fc0616e79d13b008b0a47e0458b6e"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31471.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.14.0"
                },
                {
                  "fixed": "6.18.21"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "6.19.11"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31471.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:36.795453310Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/371a43c4ac70cac0de9f9b1fc5b1660b9565b9f1",
        "https://git.kernel.org/stable/c/5784a1e2889c9525a8f036cb586930e232170bf7",
        "https://git.kernel.org/stable/c/d849a2f7309fc0616e79d13b008b0a47e0458b6e",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31471.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-31471",
        "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/2026/31xxx/CVE-2026-31471.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-31471",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 504101,
  "published_at": "2026-04-22T13:53:59.595+00:00"
}