Linux Kernel mxser Driver Buffer Management Vulnerability

A vulnerability in the Linux kernel's mxser driver has been addressed, concerning improper management of transmission buffers during the activation process. When the Line Status Register (LSR) indicates a value of 0xff, the activation function returns an error. However, if the shutdown function has not been called in response to this error, the allocated buffer remains unfreed, leading to a memory leak. The vulnerability has been fixed by ensuring the buffer is properly released in a designated error-handling section, particularly when the information type is not set.

Impact

The vulnerability could lead to a memory leak, where allocated buffers are not properly freed, potentially causing increased memory usage and degradation of system performance over time.