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, ffs_data_got_descs() generates the

eps_addrmap which contains the endpoint direction. However, epfile->in

was previously only populated in ffs_func_eps_enable() which executes

upon USB host connection. As a result, early userspace ioctls like

FUNCTIONFS_DMABUF_ATTACH that run before the host connects would see

epfile->in as 0, leading to incorrect DMA directions.

By moving the initialization to ffs_epfiles_create(), epfile->in is

accurate before userspace opens the endpoint files.