CVE-2025-39937 (GCVE-0-2025-39937)

Vulnerability from cvelistv5 – Published: 2025-10-04 07:31 – Updated: 2026-05-11 21:39
VLAI
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
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6992 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 7d5e9737efda16535e5b54bd627ef4881d11d31f , < 184f608a68f96794e8fe58cd5535014d53622cde (git)
Affected: 7d5e9737efda16535e5b54bd627ef4881d11d31f , < 8793e7a8e1b60131a825457174ed6398111daeb7 (git)
Affected: 7d5e9737efda16535e5b54bd627ef4881d11d31f , < ada2282259243387e6b6e89239aeb4897e62f051 (git)
Affected: 7d5e9737efda16535e5b54bd627ef4881d11d31f , < 47ade5f9d70b23a119ec20b1c6504864b2543a79 (git)
Affected: 7d5e9737efda16535e5b54bd627ef4881d11d31f , < 689aee35ce671aab752f159e5c8e66d7685e6887 (git)
Affected: 7d5e9737efda16535e5b54bd627ef4881d11d31f , < 21ba85d9d508422ca9e6698463ff9357c928c22d (git)
Affected: 7d5e9737efda16535e5b54bd627ef4881d11d31f , < 21a39b958b4bcf44f7674bfbbe1bbb8cad0d842d (git)
Affected: 7d5e9737efda16535e5b54bd627ef4881d11d31f , < b6f56a44e4c1014b08859dcf04ed246500e310e5 (git)
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Linux Linux Affected: 4.6
Unaffected: 0 , < 4.6 (semver)
Unaffected: 5.4.300 , ≤ 5.4.* (semver)
Unaffected: 5.10.245 , ≤ 5.10.* (semver)
Unaffected: 5.15.194 , ≤ 5.15.* (semver)
Unaffected: 6.1.154 , ≤ 6.1.* (semver)
Unaffected: 6.6.108 , ≤ 6.6.* (semver)
Unaffected: 6.12.49 , ≤ 6.12.* (semver)
Unaffected: 6.16.9 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
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          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet: rfkill: gpio: Soluciona un fallo debido a la desreferenciaci\u00f3n de un puntero no inicializado\n\nDesde el commit 7d5e9737efda (\u0027net: rfkill: gpio: obtener el nombre y el tipo de la propiedad del dispositivo\u0027), se llama a rfkill_find_type() con la variable local posiblemente no inicializada \u0027const char *type_name;\u0027.\n\nEn sistemas x86, cuando rfkill-gpio se enlaza a un acpi_device \u0027BCM4752\u0027 o \u0027LNV4752\u0027, el rfkill-\u003etype se establece bas\u00e1ndose en el acpi_device_id de ACPI:\n\n        rfkill-\u003etype = (unsigned)id-\u003edriver_data;\n\ny no hay una propiedad \u0027type\u0027, por lo que device_property_read_string() fallar\u00e1 y dejar\u00e1 type_name sin inicializar, lo que lleva a un fallo potencial.\n\nrfkill_find_type() s\u00ed acepta un puntero NULL; soluciona el fallo potencial inicializando type_name a NULL.\n\nTenga en cuenta que probablemente hasta ahora esto no ha sido detectado porque:\n\n1. No muchas m\u00e1quinas x86 realmente tienen un acpi_device \u0027BCM4752\u0027/\u0027LNV4752\u0027\n2. La pila casualmente conten\u00eda NULL donde se almacena type_name"
          }
        ],
        "id": "CVE-2025-39937",
        "lastModified": "2026-10-19T21:10:00.160",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2025-10-04T08:15:46.593",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/184f608a68f96794e8fe58cd5535014d53622cde"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/21a39b958b4bcf44f7674bfbbe1bbb8cad0d842d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/21ba85d9d508422ca9e6698463ff9357c928c22d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/47ade5f9d70b23a119ec20b1c6504864b2543a79"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/689aee35ce671aab752f159e5c8e66d7685e6887"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/8793e7a8e1b60131a825457174ed6398111daeb7"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/ada2282259243387e6b6e89239aeb4897e62f051"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/b6f56a44e4c1014b08859dcf04ed246500e310e5"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-476"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-06-30T10:34:01+00:00",
      "cve": "CVE-2025-39937",
      "id": "CVE-2025-39937",
      "initial_release_date": "2025-10-04T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel (rfkill-gpio): Denial of Service via uninitialized pointer dereference",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-39937.json",
      "version": "3"
    }
  }
}



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