Linux Kernel CIFS Memory Leak Vulnerability

A memory leak vulnerability has been identified in the Linux kernel's CIFS (Common Internet File System) implementation. This issue arises when the 'index' equals 'next_cached', leading to a reference count leak on the struct page. The vulnerability has been addressed by modifying the code to use 'readahead_folio()', which properly manages the reference count.

Impact

Exploitation of this vulnerability leads to a memory leak, where reference counts are not properly released, potentially causing increased memory usage and degradation of system performance over time.