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.
CVSS
No CVSS.
References
Configurations
No configuration.
History
No history.
Information
Published : 2025-10-20 06:15
Updated : 2026-06-17 09:21
NVD link : CVE-2025-40004
Mitre link : CVE-2025-40004
CVE.ORG link : CVE-2025-40004
JSON object : View
Products Affected
No product.
CWE
No CWE.