CVE-2025-39937 (GCVE-0-2025-39937)
Vulnerability from cvelistv5 – Published: 2025-10-04 07:31 – Updated: 2026-05-11 21:39
VLAI
EPSS
VEX
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)
Assigner
References
8 references
Impacted products
2 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) |
guessed | |
| 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) |
guessed |
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{
"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"
},
{
"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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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.