linux-cve-announce - CVE-2023-53840: usb: early: xhci-dbc: Fix a potential out-of-bound memory access

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Message-ID: <2025120957-CVE-2023-53840-797d@gregkh>
Date: Tue,  9 Dec 2025 10:31:24 +0900
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-53840: usb: early: xhci-dbc: Fix a potential out-of-bound memory access

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

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

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

usb: early: xhci-dbc: Fix a potential out-of-bound memory access

If xdbc_bulk_write() fails, the values in 'buf' can be anything. So the
string is not guaranteed to be NULL terminated when xdbc_trace() is called.

Reserve an extra byte, which will be zeroed automatically because 'buf' is
a static variable, in order to avoid troubles, should it happen.

The Linux kernel CVE team has assigned CVE-2023-53840 to this issue.


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

	Issue introduced in 4.12 with commit aeb9dd1de98c1a5f2007ea5d2a154c1244caf8a0 and fixed in 5.15.99 with commit e8fb0f13e45cf361fd06593d3cb2d89915cd3bd0
	Issue introduced in 4.12 with commit aeb9dd1de98c1a5f2007ea5d2a154c1244caf8a0 and fixed in 6.1.16 with commit 351c8d8650d1ccc006255fa01f98b6c6496a02e5
	Issue introduced in 4.12 with commit aeb9dd1de98c1a5f2007ea5d2a154c1244caf8a0 and fixed in 6.2.3 with commit df7c8aba7309f4dc55df94e06b67f576c0f52406
	Issue introduced in 4.12 with commit aeb9dd1de98c1a5f2007ea5d2a154c1244caf8a0 and fixed in 6.3 with commit a4a97ab3db5c081eb6e7dba91306adefb461e0bd

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-2023-53840
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/early/xhci-dbc.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/e8fb0f13e45cf361fd06593d3cb2d89915cd3bd0
	https://git.kernel.org/stable/c/351c8d8650d1ccc006255fa01f98b6c6496a02e5
	https://git.kernel.org/stable/c/df7c8aba7309f4dc55df94e06b67f576c0f52406
	https://git.kernel.org/stable/c/a4a97ab3db5c081eb6e7dba91306adefb461e0bd