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Change History

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

net/9p: Fix buffer overflow in USB transport layer

A buffer overflow vulnerability exists in the USB 9pfs transport layer
where inconsistent size validation between packet header parsing and
actual data copying allows a malicious USB host to overflow heap buffers.

The issue occurs because:
- usb9pfs_rx_header() validates only the declared size in packet header
- usb9pfs_rx_complete() uses req->actual (actual received bytes) for
memcpy

This allows an attacker to craft packets with small declared size
(bypassing validation) but large actual payload (triggering overflow
in memcpy).

Add validation in usb9pfs_rx_complete() to ensure req->actual does not
exceed the buffer capacity before copying data.

https://git.kernel.org/stable/c/0da18d49f874d444ad83c8a546fa33bfcf2f582c

https://git.kernel.org/stable/c/c04db81cd0288dfc68b7a0f7d09bd49b40bba451

https://git.kernel.org/stable/c/df8462f0fc045b4475dc494a5787a03c972ba2a2