CVE-2025-39937 — net: rfkill: gpio: Fix crash due to dereferencering uninitialized pointer

Affected: Linux

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

USN-8033-1 — linux, linux-aws, linux-gcp, linux-gke, linux-gkeop, linux-hwe-5.15, linux-ibm, linux-ibm-5.15, linux-lowlatency, linux…

Affected: Ubuntu:Pro:20.04:LTS: linux-hwe-5.15, Ubuntu:Pro:20.04:LTS: linux-ibm-5.15, Ubuntu:Pro:20.04:LTS: linux-lowlatency-hwe-5.15, Ubuntu:22.04:LTS: linux, Ubuntu:22.04:LTS: linux-aws, Ubuntu:22.04:LTS: linux-gcp, Ubuntu:22.04:LTS: linux-gke, Ubuntu:22.04:LTS: linux-gkeop, Ubuntu:22.04:LTS: linux-ibm, Ubuntu:22.04:LTS: linux-lowlatency

Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system. This update corrects flaws in the following subsystems: - Nios II architecture; - Sun Sparc architecture; - User-Mode Linux (UML); - x86 architecture; - Block layer subsystem; - Cryptographic API; - Drivers core; - Bus devices; - Hardware random number generator core; - Data acquisition framework and drivers; - CPU frequency scaling framework; - DMA engine subsystem; - GPU drivers; - HW tracing; - Input Device (Miscellaneous) drivers; - Multiple devices driver; - Media drivers; - MOST (Media Oriented Systems Transport) drivers; - MTD block device drivers; - Network drivers; - NVME drivers; - PCI subsystem; - Performance monitor drivers; - Pin controllers subsystem; - x86 platform drivers; - PPS (Pulse Per Second) driver; - PWM drivers; - SCSI subsystem; - TCM subsystem; - Userspace I/O drivers; - USB Gadget drivers; - USB Host Controller drivers; - Framebuffer layer; - BTRFS file system; - File systems infrastructure; - Ext4 file system; - Network file system (NFS) server daemon; - NTFS3 file system; - SMB network file system; - padata parallel execution mechanism; - IP tunnels definitions; - Network sockets; - XFRM subsystem; - Control group (cgroup); - Padata parallel execution mechanism; - PID allocator; - Tracing infrastructure; - Memory management; - 9…

Most recent entries from all

CVE-2025-39937 — net: rfkill: gpio: Fix crash due to dereferencering uninitialized pointer

USN-8033-1 — linux, linux-aws, linux-gcp, linux-gke, linux-gkeop, linux-hwe-5.15, linux-ibm, linux-ibm-5.15, linux-lowlatency, linux…