linux-cve-announce - CVE-2022-49844: can: dev: fix skb drop check

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Message-ID: <2025050141-CVE-2022-49844-e0b9@gregkh>
Date: Thu,  1 May 2025 16:10:34 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-49844: can: dev: fix skb drop check

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

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

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

can: dev: fix skb drop check

In commit a6d190f8c767 ("can: skb: drop tx skb if in listen only
mode") the priv->ctrlmode element is read even on virtual CAN
interfaces that do not create the struct can_priv at startup. This
out-of-bounds read may lead to CAN frame drops for virtual CAN
interfaces like vcan and vxcan.

This patch mainly reverts the original commit and adds a new helper
for CAN interface drivers that provide the required information in
struct can_priv.

[mkl: patch pch_can, too]

The Linux kernel CVE team has assigned CVE-2022-49844 to this issue.


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

	Issue introduced in 6.0 with commit a6d190f8c7670068d8c154ef8477eca07b5e3574 and fixed in 6.0.9 with commit 386c49fe31ee748e053860b3bac7794a933ac9ac
	Issue introduced in 6.0 with commit a6d190f8c7670068d8c154ef8477eca07b5e3574 and fixed in 6.1 with commit ae64438be1923e3c1102d90fd41db7afcfaf54cc

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-2022-49844
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/at91_can.c
	drivers/net/can/c_can/c_can_main.c
	drivers/net/can/can327.c
	drivers/net/can/cc770/cc770.c
	drivers/net/can/ctucanfd/ctucanfd_base.c
	drivers/net/can/dev/skb.c
	drivers/net/can/flexcan/flexcan-core.c
	drivers/net/can/grcan.c
	drivers/net/can/ifi_canfd/ifi_canfd.c
	drivers/net/can/janz-ican3.c
	drivers/net/can/kvaser_pciefd.c
	drivers/net/can/m_can/m_can.c
	drivers/net/can/mscan/mscan.c
	drivers/net/can/pch_can.c
	drivers/net/can/peak_canfd/peak_canfd.c
	drivers/net/can/rcar/rcar_can.c
	drivers/net/can/rcar/rcar_canfd.c
	drivers/net/can/sja1000/sja1000.c
	drivers/net/can/slcan/slcan-core.c
	drivers/net/can/softing/softing_main.c
	drivers/net/can/spi/hi311x.c
	drivers/net/can/spi/mcp251x.c
	drivers/net/can/spi/mcp251xfd/mcp251xfd-tx.c
	drivers/net/can/sun4i_can.c
	drivers/net/can/ti_hecc.c
	drivers/net/can/usb/ems_usb.c
	drivers/net/can/usb/esd_usb.c
	drivers/net/can/usb/etas_es58x/es58x_core.c
	drivers/net/can/usb/gs_usb.c
	drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c
	drivers/net/can/usb/mcba_usb.c
	drivers/net/can/usb/peak_usb/pcan_usb_core.c
	drivers/net/can/usb/ucan.c
	drivers/net/can/usb/usb_8dev.c
	drivers/net/can/xilinx_can.c
	include/linux/can/dev.h


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/386c49fe31ee748e053860b3bac7794a933ac9ac
	https://git.kernel.org/stable/c/ae64438be1923e3c1102d90fd41db7afcfaf54cc