CVE-2026-43425: usb: image: mdc800: kill download URB on timeout

CVE-2026-43425: usb: image: mdc800: kill download URB on timeout

[Greg Kroah-Hartman]

From: Greg Kroah-Hartman <gregkh@kernel.org>

Description
===========

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

usb: image: mdc800: kill download URB on timeout

mdc800_device_read() submits download_urb and waits for completion.
If the timeout fires and the device has not responded, the function
returns without killing the URB, leaving it active.

A subsequent read() resubmits the same URB while it is still
in-flight, triggering the WARN in usb_submit_urb():

  "URB submitted while active"

Check the return value of wait_event_timeout() and kill the URB if
it indicates timeout, ensuring the URB is complete before its status
is inspected or the URB is resubmitted.

Similar to
- commit 372c93131998 ("USB: yurex: fix control-URB timeout handling")
- commit b98d5000c505 ("media: rc: iguanair: handle timeouts")

The Linux kernel CVE team has assigned CVE-2026-43425 to this issue.


Affected and fixed versions
===========================

	Fixed in 5.10.253 with commit 9fa5a49760979ba016506fe292a431c8b83f043e
	Fixed in 5.15.203 with commit 15536f6c15f48037a1672cbdea53266d67861ff6
	Fixed in 6.1.167 with commit 9bf877cc67309b2a063b0087c3ad8585fb11cec3
	Fixed in 6.6.130 with commit 155f471e38aa516f6c58c2ae03ca3dc222fa2fdb
	Fixed in 6.12.78 with commit d4a400a6a4c4d49f77a04a3f401df5ae1a10657c
	Fixed in 6.18.19 with commit b7fed917f84e484e06c5e9926746d0b524e3a93e
	Fixed in 6.19.9 with commit cc7398447810c9450c90d092efe9997569f8d96f
	Fixed in 7.0 with commit 1be3b77de4eb89af8ae2fd6610546be778e25589

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2026-43425
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	drivers/usb/image/mdc800.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/9fa5a49760979ba016506fe292a431c8b83f043e
	https://git.kernel.org/stable/c/15536f6c15f48037a1672cbdea53266d67861ff6
	https://git.kernel.org/stable/c/9bf877cc67309b2a063b0087c3ad8585fb11cec3
	https://git.kernel.org/stable/c/155f471e38aa516f6c58c2ae03ca3dc222fa2fdb
	https://git.kernel.org/stable/c/d4a400a6a4c4d49f77a04a3f401df5ae1a10657c
	https://git.kernel.org/stable/c/b7fed917f84e484e06c5e9926746d0b524e3a93e
	https://git.kernel.org/stable/c/cc7398447810c9450c90d092efe9997569f8d96f
	https://git.kernel.org/stable/c/1be3b77de4eb89af8ae2fd6610546be778e25589