CVE-2023-53529: 
Linux Kernel vulnerability analysis and mitigation

CVE-2023-53529 is a memory leak vulnerability discovered in the Linux kernel's rtw88_usb WiFi driver. The vulnerability was disclosed on October 1, 2025, affecting the rtw88 USB driver component. The issue occurs during the USB probe routine where memory allocated during device initialization is not properly freed when the driver is unloaded (NVD, Ubuntu).

The vulnerability manifests as a memory leak in the rtw88usb driver's probe routine. When the driver is unloaded, it leaves a dangling pointer to allocated memory of size 512 bytes. The leak was verified through kmemleak, which showed an unreferenced object at address 0xffff895cb29bba00. The allocated memory should have been freed in the rtwusbintfdeinit() function but wasn't, leading to resource consumption (RedHat).

The impact of this vulnerability is primarily related to system resource consumption. While the leak size is relatively small (512 bytes per occurrence), repeated device unplugging/replugging or driver reloading could lead to cumulative memory leaks, potentially affecting system stability over time. The vulnerability has been assigned a medium priority rating by Ubuntu, indicating moderate severity (Ubuntu).

The vulnerability has been patched in the Linux kernel by implementing proper memory cleanup in the rtwusbintf_deinit() function. The fix ensures that the allocated memory is properly freed when the driver is unloaded. Users are advised to update their kernel to a version containing the fix (NVD).