linux-cve-announce - CVE-2026-23080: can: mcba_usb: mcba_usb_read_bulk

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Message-ID: <2026020421-CVE-2026-23080-74d1@gregkh>
Date: Wed,  4 Feb 2026 17:14:39 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2026-23080: can: mcba_usb: mcba_usb_read_bulk_callback(): fix URB memory leak

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

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

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

can: mcba_usb: mcba_usb_read_bulk_callback(): fix URB memory leak

Fix similar memory leak as in commit 7352e1d5932a ("can: gs_usb:
gs_usb_receive_bulk_callback(): fix URB memory leak").

In mcba_usb_probe() -> mcba_usb_start(), the URBs for USB-in transfers are
allocated, added to the priv->rx_submitted anchor and submitted. In the
complete callback mcba_usb_read_bulk_callback(), the URBs are processed and
resubmitted. In mcba_usb_close() -> mcba_urb_unlink() the URBs are freed by
calling usb_kill_anchored_urbs(&priv->rx_submitted).

However, this does not take into account that the USB framework unanchors
the URB before the complete function is called. This means that once an
in-URB has been completed, it is no longer anchored and is ultimately not
released in usb_kill_anchored_urbs().

Fix the memory leak by anchoring the URB in the
mcba_usb_read_bulk_callback()to the priv->rx_submitted anchor.

The Linux kernel CVE team has assigned CVE-2026-23080 to this issue.

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

	Issue introduced in 4.12 with commit 51f3baad7de943780ce0c17bd7975df567dd6e14 and fixed in 6.6.122 with commit 179f6f0cf5ae489743273b7c1644324c0c477ea9
	Issue introduced in 4.12 with commit 51f3baad7de943780ce0c17bd7975df567dd6e14 and fixed in 6.12.68 with commit 94c9f6f7b953f6382fef4bdc48c046b861b8868f
	Issue introduced in 4.12 with commit 51f3baad7de943780ce0c17bd7975df567dd6e14 and fixed in 6.18.8 with commit d374d715e338dfc3804aaa006fa6e470ffebb264
	Issue introduced in 4.12 with commit 51f3baad7de943780ce0c17bd7975df567dd6e14 and fixed in 6.19-rc7 with commit 710a7529fb13c5a470258ff5508ed3c498d54729

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-2026-23080
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/net/can/usb/mcba_usb.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/179f6f0cf5ae489743273b7c1644324c0c477ea9
	https://git.kernel.org/stable/c/94c9f6f7b953f6382fef4bdc48c046b861b8868f
	https://git.kernel.org/stable/c/d374d715e338dfc3804aaa006fa6e470ffebb264
	https://git.kernel.org/stable/c/710a7529fb13c5a470258ff5508ed3c498d54729