driver core: class: Fix wild pointer dereferences in API class_dev_iter_next()

{
  "id": "a87c2b2607838fcffe5a46efa9d69c66ccbb2324feb702b7b6379d1e8f07165e",
  "url": "https://osv.dev/vulnerability/CVE-2025-21810",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "driver core: class: Fix wild pointer dereferences in API class_dev_iter_next()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: driver core: class: Fix wild pointer dereferences in API class_dev_iter_next() There are a potential wild pointer dereferences issue regarding APIs class_dev_iter_(init|next|exit)(), as explained by below typical usage: // All members of @iter are wild pointers. struct class_dev_iter iter; // class_dev_iter_init(@iter, @class, ...) checks parameter @class for // potential class_to_subsys() error, and it returns void type and does // not initialize its output parameter @iter, so caller can not detect // the error and continues to invoke class_dev_iter_next(@iter) even if // @iter still contains wild pointers. class_dev_iter_init(&iter, ...); // Dereference these wild pointers in @iter here once suffer the error. while (dev = class_dev_iter_next(&iter)) { ... }; // Also dereference these wild pointers here. class_dev_iter_exit(&iter); Actually, all callers of these APIs have such usage pattern in kernel tree. Fix by: - Initialize output parameter @iter by memset() in class_dev_iter_init() and give callers prompt by pr_crit() for the error. - Check if @iter is valid in class_dev_iter_next().",
    "evidence": "osv:CVE-2025-21810",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.6.76",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.13",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.13.2",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2025-21810",
      "aliases": [
        "CVE-2025-21810"
      ],
      "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": "7b884b7f24b42fa25e92ed724ad82f137610afaf"
                },
                {
                  "fixed": "f4b9bc823b0cfdebfed479c0e87d6939c7562e87"
                },
                {
                  "fixed": "1614e75d1a1b63db6421c7a4bf37004720c7376c"
                },
                {
                  "fixed": "5c504e9767b947cf7d4e29b811c0c8b3c53242b7"
                },
                {
                  "fixed": "e128f82f7006991c99a58114f70ef61e937b1ac1"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-21810.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.4.0"
                },
                {
                  "fixed": "6.6.76"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.13"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.13.2"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-21810.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:51.365066316Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/1614e75d1a1b63db6421c7a4bf37004720c7376c",
        "https://git.kernel.org/stable/c/5c504e9767b947cf7d4e29b811c0c8b3c53242b7",
        "https://git.kernel.org/stable/c/e128f82f7006991c99a58114f70ef61e937b1ac1",
        "https://git.kernel.org/stable/c/f4b9bc823b0cfdebfed479c0e87d6939c7562e87",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21810.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-21810",
        "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/2025/21xxx/CVE-2025-21810.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-21810",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 519640,
  "published_at": "2025-02-27T20:01:01.63+00:00"
}