From: Sebastian Josue Alba Vives <sebasjosue84@gmail.com>
To: security@kernel.org
Cc: gregkh@linuxfoundation.org, shuah@kernel.org,
stable@vger.kernel.org,
"Sebastián Alba Vives" <sebasjosue84@gmail.com>
Subject: [SECURITY] usbip: vhci: heap buffer overflow via crafted number_of_packets in RET_SUBMIT
Date: Sun, 29 Mar 2026 06:53:32 -0600 [thread overview]
Message-ID: <20260329125437.517980-1-sebasjosue84@gmail.com> (raw)
A malicious USB/IP server can send a RET_SUBMIT response with
number_of_packets larger than the original URB allocation, causing
usbip_recv_iso() and usbip_pad_iso() to write beyond
urb->iso_frame_desc[], overflowing the kernel heap.
Attack chain:
1. Client sends isochronous URB with number_of_packets = N
2. usbip_pack_pdu() overwrites urb->number_of_packets with N'
3. usbip_recv_iso() loops N' times over iso_frame_desc[N] -> OOB
4. usbip_pad_iso() also loops with N' -> second OOB
CVE-2016-3955 fixed the same pattern in usbip_recv_xbuff() for
actual_length but missed number_of_packets in usbip_recv_iso().
stub_rx.c validates for CMD_SUBMIT but vhci_rx.c has no validation
for RET_SUBMIT.
Impact: Remote heap buffer overflow WRITE, no auth, attacker
controlled data, potential kernel code execution. Affects all
kernels with CONFIG_USBIP_VHCI_HCD since USB/IP integration.
Found through manual source code auditing.
Reported-by: Sebastián Alba Vives <sebasjosue84@gmail.com>
next reply other threads:[~2026-03-29 12:56 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-29 12:53 Sebastian Josue Alba Vives [this message]
2026-03-29 12:53 ` [PATCH] usbip: vhci: validate number_of_packets in RET_SUBMIT response Sebastian Josue Alba Vives
2026-03-29 13:25 ` Greg KH
2026-03-29 13:17 ` [SECURITY] usbip: iso_frame_desc OOB memmove via crafted offset/length Sebastian Josue Alba Vives
2026-03-29 13:17 ` [PATCH] usbip: validate iso_frame_desc offset and length in usbip_recv_iso() Sebastian Josue Alba Vives
2026-03-29 13:24 ` [SECURITY] usbip: vhci: heap buffer overflow via crafted number_of_packets in RET_SUBMIT Greg KH
2026-03-29 13:34 ` Sebastián Alba
2026-03-29 13:50 ` Greg KH
2026-03-29 13:53 ` Sebastián Alba
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