CVE-2024-56626 is a high-severity vulnerability in the Linux kernel's ksmbd component. It involves an out-of-bounds write in the function ksmbd_vfs_stream_write caused by a negative offset value from the client. This flaw can lead to writing data outside the allocated buffer when the 'vfs objects = streams_xattr' parameter is set in ksmbd.conf. The vulnerability has been fixed in the Linux kernel.