CVE-2025-39937
Analyzed
Analyzed - Analysis Complete
BaseFortify
Publication date: 2025-10-04
Last updated on: 2026-03-25
Assigner: kernel.org
Description
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
Affected Vendors & Products
| 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
KEV
| CWE ID | Description |
|---|---|
| CWE-476 | The product dereferences a pointer that it expects to be valid but is NULL. |
