Ubuntu: (Multiple Advisories) (CVE-2025-21660): Linux kernel vulnerabilities

In the Linux kernel, the following vulnerability has been resolved:

ksmbd: fix unexpectedly changed path in ksmbd_vfs_kern_path_locked

When `ksmbd_vfs_kern_path_locked` met an error and it is not the last
entry, it will exit without restoring changed path buffer. But later this
buffer may be used as the filename for creation.