linux-cve-announce - CVE-2021-47670: can: peak

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <2025041734-CVE-2021-47670-2b77@gregkh>
Date: Thu, 17 Apr 2025 20:01:36 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2021-47670: can: peak_usb: fix use after free bugs

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

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

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

can: peak_usb: fix use after free bugs

After calling peak_usb_netif_rx_ni(skb), dereferencing skb is unsafe.
Especially, the can_frame cf which aliases skb memory is accessed
after the peak_usb_netif_rx_ni().

Reordering the lines solves the issue.

The Linux kernel CVE team has assigned CVE-2021-47670 to this issue.


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

	Issue introduced in 4.0 with commit 0a25e1f4f18566b750ebd3ae995af64e23111e63 and fixed in 4.19.171 with commit 5408824636fa0dfedb9ecb0d94abd573131bfbbe
	Issue introduced in 4.0 with commit 0a25e1f4f18566b750ebd3ae995af64e23111e63 and fixed in 5.4.93 with commit ddd1416f44130377798c1430b76503513b7497c2
	Issue introduced in 4.0 with commit 0a25e1f4f18566b750ebd3ae995af64e23111e63 and fixed in 5.10.11 with commit ec939c13c3fff2114479769c8380b7f1a54feca9
	Issue introduced in 4.0 with commit 0a25e1f4f18566b750ebd3ae995af64e23111e63 and fixed in 5.11 with commit 50aca891d7a554db0901b245167cd653d73aaa71

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-2021-47670
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/peak_usb/pcan_usb_fd.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/5408824636fa0dfedb9ecb0d94abd573131bfbbe
	https://git.kernel.org/stable/c/ddd1416f44130377798c1430b76503513b7497c2
	https://git.kernel.org/stable/c/ec939c13c3fff2114479769c8380b7f1a54feca9
	https://git.kernel.org/stable/c/50aca891d7a554db0901b245167cd653d73aaa71