CVE-2026-64327

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

usb: gadget: f_fs: Initialize epfile->in early to fix endpoint direction checks

When parsing endpoint descriptors, ffsdatagotdescs() generates the epsaddrmap which contains the endpoint direction. However, epfile->in was previously only populated in ffsfuncepsenable() which executes upon USB host connection. As a result, early userspace ioctls like FUNCTIONFSDMABUF_ATTACH that run before the host connects would see epfile->in as 0, leading to incorrect DMA directions.

By moving the initialization to ffsepfilescreate(), epfile->in is accurate before userspace opens the endpoint files.