Memory Leak in Linux Kernel's UBIFS during File Renaming

CVE-2023-53396

What is CVE-2023-53396?

A memory leak vulnerability has been identified in the Linux kernel's UBIFS component, occurring when renaming files within encrypted directories. The function fscrypt_setup_filename allocates memory for the file name, which is ultimately unused and not released before the function returns. This oversight leads to a registered memory leak, visible during kmemleak scans. The fix involves removing the unnecessary call to fscrypt_setup_filename in the renaming process, thereby preventing the leak and enhancing overall memory efficiency.

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