PT-2026-64548 · Linux · Linux

CVE-2026-64327 · Published 2026-07-25 · Updated 2026-07-25

NVD

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.

Related Identifiers

CVE-2026-64327

Affected Products

Linux

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-64327 · Security Note
• https://git.kernel.org/stable/c/9e04055ab5fc0470a0031ee6934739f9aa8f34a5 · Note
• https://git.kernel.org/stable/c/f99f32ea9aa976afcbec20647ed33b50a52002c1 · Note
• https://git.kernel.org/stable/c/82cfd4739011bdc7e87b5d585703427e89ddfaa5 · Note
• https://git.kernel.org/stable/c/82cf1142e5ccf2b6d6d22ef713aaf3e5f2b5716b · Note