net: rfkill: gpio: Fix crash due to dereferencering uninitialized pointer

{
  "id": "82c55dda265bc3e324b9b2143a7de355b05ff9a8272f8b1b25c62978fadea236",
  "url": "https://osv.dev/vulnerability/CVE-2025-39937",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "net: rfkill: gpio: Fix crash due to dereferencering uninitialized pointer",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: net: rfkill: gpio: Fix crash due to dereferencering uninitialized pointer Since commit 7d5e9737efda (\"net: rfkill: gpio: get the name and type from device property\") rfkill_find_type() gets called with the possibly uninitialized \"const char *type_name;\" local variable. On x86 systems when rfkill-gpio binds to a \"BCM4752\" or \"LNV4752\" acpi_device, the rfkill->type is set based on the ACPI acpi_device_id: rfkill->type = (unsigned)id->driver_data; and there is no \"type\" property so device_property_read_string() will fail and leave type_name uninitialized, leading to a potential crash. rfkill_find_type() does accept a NULL pointer, fix the potential crash by initializing type_name to NULL. Note likely sofar this has not been caught because: 1. Not many x86 machines actually have a \"BCM4752\"/\"LNV4752\" acpi_device 2. The stack happened to contain NULL where type_name is stored",
    "evidence": "osv:CVE-2025-39937",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.4.300",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.10.245",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.194",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.154",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.108",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.49",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.16.9",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2025-39937",
      "aliases": [
        "CVE-2025-39937"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "7d5e9737efda16535e5b54bd627ef4881d11d31f"
                },
                {
                  "fixed": "184f608a68f96794e8fe58cd5535014d53622cde"
                },
                {
                  "fixed": "8793e7a8e1b60131a825457174ed6398111daeb7"
                },
                {
                  "fixed": "ada2282259243387e6b6e89239aeb4897e62f051"
                },
                {
                  "fixed": "47ade5f9d70b23a119ec20b1c6504864b2543a79"
                },
                {
                  "fixed": "689aee35ce671aab752f159e5c8e66d7685e6887"
                },
                {
                  "fixed": "21ba85d9d508422ca9e6698463ff9357c928c22d"
                },
                {
                  "fixed": "21a39b958b4bcf44f7674bfbbe1bbb8cad0d842d"
                },
                {
                  "fixed": "b6f56a44e4c1014b08859dcf04ed246500e310e5"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-39937.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "4.6.0"
                },
                {
                  "fixed": "5.4.300"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.5.0"
                },
                {
                  "fixed": "5.10.245"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
                  "fixed": "5.15.194"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.154"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.108"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.49"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.16.9"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-39937.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:36.925441294Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/184f608a68f96794e8fe58cd5535014d53622cde",
        "https://git.kernel.org/stable/c/21a39b958b4bcf44f7674bfbbe1bbb8cad0d842d",
        "https://git.kernel.org/stable/c/21ba85d9d508422ca9e6698463ff9357c928c22d",
        "https://git.kernel.org/stable/c/47ade5f9d70b23a119ec20b1c6504864b2543a79",
        "https://git.kernel.org/stable/c/689aee35ce671aab752f159e5c8e66d7685e6887",
        "https://git.kernel.org/stable/c/8793e7a8e1b60131a825457174ed6398111daeb7",
        "https://git.kernel.org/stable/c/ada2282259243387e6b6e89239aeb4897e62f051",
        "https://git.kernel.org/stable/c/b6f56a44e4c1014b08859dcf04ed246500e310e5",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39937.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-39937",
        "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/2025/39xxx/CVE-2025-39937.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-39937",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 504376,
  "published_at": "2025-10-04T07:31:00.879+00:00"
}