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

ksmbd: Fix UAF in __close_file_table_ids

A use-after-free is possible if one thread destroys the file
via __ksmbd_close_fd while another thread holds a reference to
it. The existing checks on fp->refcount are not sufficient to
prevent this.

The fix takes ft->lock around the section which removes the
file from the file table. This prevents two threads acquiring the
same file pointer via __close_file_table_ids, as well as the other
functions which retrieve a file from the IDR and which already use
this same lock.

https://git.kernel.org/stable/c/16727e442568a46d9cca69fe2595896de86e120d

https://git.kernel.org/stable/c/36991c1ccde2d5a521577c448ffe07fcccfe104d

https://git.kernel.org/stable/c/9e9841e232b51171ddf3bc4ee517d5d28dc8cad6

https://git.kernel.org/stable/c/fec1f9e9a650e8e7011330a085c77e7bf2a08ea9