CVE-2023-52863: 
Linux Kernel vulnerability analysis and mitigation

CVE-2023-52863 is a vulnerability in the Linux kernel's hardware monitoring (hwmon) subsystem, specifically in the AXI fan control driver. The vulnerability was discovered in May 2024 and affects Linux kernel versions from 5.7 through 6.6.2. The issue involves a NULL pointer dereference in the axi_fan_control_irq_handler() function that could occur before the hwmon device is properly registered (NVD).

The vulnerability occurs when the axi_fan_control_irq_handler() function, which depends on the private axi_fan_control_data structure, is called before the hwmon device registration is complete. This timing issue can lead to a NULL pointer dereference error. The vulnerability has been assigned a CVSS v3.1 Base Score of 5.5 (Medium) with the vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H (NVD).

The vulnerability can cause a denial of service condition through a kernel crash when the NULL pointer dereference occurs. The impact is limited to local attacks and requires low privileges to exploit (NVD).

The vulnerability requires local access and low privileges to exploit. There are no known active exploits in the wild at this time (NVD).

The vulnerability has been fixed in the Linux kernel through a patch that ensures proper initialization order. The fix involves moving the device initialization and registration code before the IRQ handler setup (Kernel Patch).