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

Vulnerability from cvelistv5 – Published: 2025-10-04 07:31 – Updated: 2025-10-04 07:37
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 ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
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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{
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          "programFiles": [
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      "cpeApplicability": [
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      "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-\u003etype is set based on the ACPI acpi_device_id:\n\n        rfkill-\u003etype = (unsigned)id-\u003edriver_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"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-10-04T07:37:01.924Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/184f608a68f96794e8fe58cd5535014d53622cde"
        },
        {
          "url": "https://git.kernel.org/stable/c/8793e7a8e1b60131a825457174ed6398111daeb7"
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        {
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          "url": "https://git.kernel.org/stable/c/21a39b958b4bcf44f7674bfbbe1bbb8cad0d842d"
        },
        {
          "url": "https://git.kernel.org/stable/c/b6f56a44e4c1014b08859dcf04ed246500e310e5"
        }
      ],
      "title": "net: rfkill: gpio: Fix crash due to dereferencering uninitialized pointer",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39937",
    "datePublished": "2025-10-04T07:31:00.879Z",
    "dateReserved": "2025-04-16T07:20:57.148Z",
    "dateUpdated": "2025-10-04T07:37:01.924Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}


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