CyberRota Analysis
AI-GeneratedThe vulnerability affects the Linux kernel's sunrpc implementation, specifically in the handling of client events and pipe directories, leading to a potential use-after-free condition. This flaw can result in memory corruption during subsequent RPC operations, which may allow an attacker to exploit the stale pointer to execute arbitrary code or crash the system. Organizations using Linux-based systems that rely on RPC services should prioritize patching this vulnerability to mitigate potential security risks.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: sunrpc: fix use-after-free in __rpc_clnt_handle_event and __rpc_clnt_remove_pipedir Normal client creation goes through rpc_setup_pipedir(), which records clnt->pipefs_sb, but the mount-event path in __rpc_clnt_handle_event() calls rpc_setup_pipedir_sb() directly and never refreshes that field. The umount path also removes the directory without clearing clnt->pipefs_sb. After a late pipefs mount or any remount, rpc_clnt_remove_pipedir() compares the current superblock against a stale pipefs_sb pointer and skips cleanup, leaving pipefs dentries whose inode private data still points at a freed rpc_clnt, leading to a potential use-after-free during subsequent rpc_info_open() or rpc_show_info() calls. Fix this by properly updating clnt->pipefs_sb upon mount events and clearing it during unmount or failure paths.