CVE-2025-39937
Full vulnerability record from the local CVENow database.
Description
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
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Analyzed
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-10-04 08:15:46.593000
Last modified
2026-10-19 21:10:00.160000
View original CVE JSON
{
"id": "CVE-2025-39937",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-10-04T08:15:46.593",
"lastModified": "2026-10-19T21:10:00.160",
"vulnStatus": "Analyzed",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: rfkill: gpio: Fix crash due to dereferencering uninitialized pointer\n\nSince commit 7d5e9737efda (\"net: rfkill: gpio: get the name and type from\ndevice property\") rfkill_find_type() gets called with the possibly\nuninitialized \"const char *type_name;\" local variable.\n\nOn x86 systems when rfkill-gpio binds to a \"BCM4752\" or \"LNV4752\"\nacpi_device, the rfkill->type is set based on the ACPI acpi_device_id:\n\n rfkill->type = (unsigned)id->driver_data;\n\nand there is no \"type\" property so device_property_read_string() will fail\nand leave type_name uninitialized, leading to a potential crash.\n\nrfkill_find_type() does accept a NULL pointer, fix the potential crash\nby initializing type_name to NULL.\n\nNote likely sofar this has not been caught because:\n\n1. Not many x86 machines actually have a \"BCM4752\"/\"LNV4752\" acpi_device\n2. The stack happened to contain NULL where type_name is stored"
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet: rfkill: gpio: Soluciona un fallo debido a la desreferenciación de un puntero no inicializado\n\nDesde el commit 7d5e9737efda ('net: rfkill: gpio: obtener el nombre y el tipo de la propiedad del dispositivo'), se llama a rfkill_find_type() con la variable local posiblemente no inicializada 'const char *type_name;'.\n\nEn sistemas x86, cuando rfkill-gpio se enlaza a un acpi_device 'BCM4752' o 'LNV4752', el rfkill->type se establece basándose en el acpi_device_id de ACPI:\n\n rfkill->type = (unsigned)id->driver_data;\n\ny no hay una propiedad 'type', por lo que device_property_read_string() fallará y dejará type_name sin inicializar, lo que lleva a un fallo potencial.\n\nrfkill_find_type() sí 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 máquinas x86 realmente tienen un acpi_device 'BCM4752'/'LNV4752'\n2. La pila casualmente contenía NULL donde se almacena type_name"
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"source": "[email protected]",
"type": "Primary",
"cvssData": {
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"baseScore": 5.5,
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"attackVector": "LOCAL",
"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"availabilityImpact": "HIGH"
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"source": "[email protected]",
"type": "Primary",
"description": [
{
"lang": "en",
"value": "CWE-476"
}
]
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