Linux Kernel up to 6.16.8 gpio rfkill_find_type uninitialized pointer

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5.5$0-$5k0.00

Summaryinfo

A vulnerability classified as critical was found in Linux Kernel up to 6.16.8. The impacted element is the function rfkill_find_type of the component gpio. Such manipulation leads to uninitialized pointer. This vulnerability is documented as CVE-2025-39937. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 6.16.8. Affected by this issue is the function rfkill_find_type of the component gpio. The manipulation with an unknown input leads to a uninitialized pointer vulnerability. Using CWE to declare the problem leads to CWE-824. The product accesses or uses a pointer that has not been initialized. Impacted is availability. CVE summarizes:

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

The advisory is available at git.kernel.org. This vulnerability is handled as CVE-2025-39937 since 04/16/2025. The exploitation is known to be easy. Technical details are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 274816 (Debian dsa-6053 : affs-modules-6.1.0-37-4kc-malta-di - security update), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.4.300, 5.10.245, 5.15.194, 6.1.154, 6.6.108, 6.12.49 or 6.16.9 eliminates this vulnerability. Applying the patch 184f608a68f96794e8fe58cd5535014d53622cde/8793e7a8e1b60131a825457174ed6398111daeb7/ada2282259243387e6b6e89239aeb4897e62f051/47ade5f9d70b23a119ec20b1c6504864b2543a79/689aee35ce671aab752f159e5c8e66d7685e6887/21ba85d9d508422ca9e6698463ff9357c928c22d/21a39b958b4bcf44f7674bfbbe1bbb8cad0d842d/b6f56a44e4c1014b08859dcf04ed246500e310e5 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (274816) and CERT Bund (WID-SEC-2025-2194). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

  • Google Container-Optimized OS
  • Debian Linux
  • Google Cloud Platform
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • Open Source Linux Kernel
  • RESF Rocky Linux
  • NetApp ActiveIQ Unified Manager
  • IBM QRadar SIEM
  • Dell NetWorker

Productinfo

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Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.5

VulDB Base Score: 5.7
VulDB Temp Score: 5.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Uninitialized pointer
CWE: CWE-824 / CWE-908
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 274816
Nessus Name: Debian dsa-6053 : affs-modules-6.1.0-37-4kc-malta-di - security update

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.4.300/5.10.245/5.15.194/6.1.154/6.6.108/6.12.49/6.16.9
Patch: 184f608a68f96794e8fe58cd5535014d53622cde/8793e7a8e1b60131a825457174ed6398111daeb7/ada2282259243387e6b6e89239aeb4897e62f051/47ade5f9d70b23a119ec20b1c6504864b2543a79/689aee35ce671aab752f159e5c8e66d7685e6887/21ba85d9d508422ca9e6698463ff9357c928c22d/21a39b958b4bcf44f7674bfbbe1bbb8cad0d842d/b6f56a44e4c1014b08859dcf04ed246500e310e5

Timelineinfo

04/16/2025 CVE reserved
10/04/2025 +171 days Advisory disclosed
10/04/2025 +0 days VulDB entry created
04/28/2026 +206 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2025-39937 (🔒)
GCVE (CVE): GCVE-0-2025-39937
GCVE (VulDB): GCVE-100-327026
CERT Bund: WID-SEC-2025-2194 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 10/04/2025 11:30
Updated: 04/28/2026 04:39
Changes: 10/04/2025 11:30 (59), 11/12/2025 06:02 (2), 11/24/2025 02:44 (7), 12/26/2025 23:27 (1), 01/27/2026 21:45 (10), 04/28/2026 04:39 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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