CVE-2021-47529: 
Linux Kernel vulnerability analysis and mitigation

CVE-2021-47529 is a vulnerability in the Linux kernel affecting the iwlwifi driver. The issue was discovered in the error handling path of the reduce_power_data functionality, where memory leaks could occur when errors happen during the processing of TLV (Type-Length-Value) data or memory allocation failures. This vulnerability affects Linux kernel versions from 5.14 up to (excluding) 5.15.7 (NVD).

The vulnerability exists in the iwlwifi driver's UEFI interface, specifically in the error handling path of the 'reduce_power_data' function. When an error occurs due to invalid TLV length or memory allocation failure, the previously allocated memory was not being freed before returning, resulting in memory leaks. The issue has been assigned a CVSS v3.1 Base Score of 5.5 MEDIUM with vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H (NVD, Kernel Patch).

The vulnerability can lead to memory leaks in the system when processing certain error conditions in the iwlwifi driver. This could potentially result in system resource exhaustion over time, affecting system stability and performance (NVD).

The vulnerability requires local access and low privileges to exploit. The attack complexity is low, but no user interaction is needed. There are no known reports of this vulnerability being exploited in the wild (NVD).

The vulnerability has been fixed through a patch that properly frees allocated memory in error handling paths. The fix involves adding appropriate kfree() calls before returning error conditions. Users should update their Linux kernel to version 5.15.7 or later to address this issue (Kernel Patch).