CVE-2025-39937
Analyzed Analyzed - Analysis Complete
BaseFortify

Publication date: 2025-10-04

Last updated on: 2026-03-25

Assigner: kernel.org

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
CVSS Scores
EPSS Scores
Probability:
Percentile:
Meta Information
Published
2025-10-04
Last Modified
2026-03-25
Generated
2026-05-07
AI Q&A
2025-10-04
EPSS Evaluated
2026-05-05
NVD
CVE-2025-39937
Affected Vendors & Products
Showing 13 associated CPEs
Vendor Product Version / Range
linux linux_kernel From 4.6 (inc) to 5.4.300 (exc)
linux linux_kernel From 5.5 (inc) to 5.10.245 (exc)
linux linux_kernel From 5.11 (inc) to 5.15.194 (exc)
linux linux_kernel From 5.16 (inc) to 6.1.154 (exc)
linux linux_kernel From 6.2 (inc) to 6.6.108 (exc)
linux linux_kernel From 6.7 (inc) to 6.12.49 (exc)
linux linux_kernel From 6.13 (inc) to 6.16.9 (exc)
linux linux_kernel 6.17
linux linux_kernel 6.17
linux linux_kernel 6.17
linux linux_kernel 6.17
linux linux_kernel 6.17
linux linux_kernel 6.17
Helpful Resources
Exploitability
CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-476 The product dereferences a pointer that it expects to be valid but is NULL.
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?

This vulnerability is a crash issue in the Linux kernel's rfkill gpio driver caused by dereferencing an uninitialized pointer. Specifically, the function rfkill_find_type() is called with a local variable 'type_name' that may not be initialized if the device property read fails. On certain x86 systems with specific ACPI devices ("BCM4752" or "LNV4752"), the type property is missing, causing the pointer to remain uninitialized and potentially leading to a crash. The fix involves initializing 'type_name' to NULL to prevent this crash.


How can this vulnerability impact me? :

This vulnerability can cause the Linux kernel to crash on affected systems, leading to system instability or downtime. Since it occurs when the rfkill gpio driver attempts to handle certain ACPI devices without proper initialization, it may cause unexpected reboots or loss of functionality related to rfkill (radio frequency kill switch) features on impacted hardware.


Ask Our AI Assistant
Need more information? Ask your question to get an AI reply (Powered by our expertise)
0/70
EPSS Chart