linux-cve-announce - CVE-2023-53553: HID: hyperv: avoid struct memcpy overrun warning

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Message-ID: <2025100448-CVE-2023-53553-f661@gregkh>
Date: Sat,  4 Oct 2025 17:17:07 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-53553: HID: hyperv: avoid struct memcpy overrun warning

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

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

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

HID: hyperv: avoid struct memcpy overrun warning

A previous patch addressed the fortified memcpy warning for most
builds, but I still see this one with gcc-9:

In file included from include/linux/string.h:254,
                 from drivers/hid/hid-hyperv.c:8:
In function 'fortify_memcpy_chk',
    inlined from 'mousevsc_on_receive' at drivers/hid/hid-hyperv.c:272:3:
include/linux/fortify-string.h:583:4: error: call to '__write_overflow_field' declared with attribute warning: detected write beyond size of field (1st parameter); maybe use struct_group()? [-Werror=attribute-warning]
  583 |    __write_overflow_field(p_size_field, size);
      |    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

My guess is that the WARN_ON() itself is what confuses gcc, so it no
longer sees that there is a correct range check. Rework the code in a
way that helps readability and avoids the warning.

The Linux kernel CVE team has assigned CVE-2023-53553 to this issue.


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

	Issue introduced in 6.2 with commit 542f25a94471570e2594be5b422b9ca572cf88a1 and fixed in 6.4.5 with commit a7902cc5f5b9c95997017c8e309da760fb1deb6e
	Issue introduced in 6.2 with commit 542f25a94471570e2594be5b422b9ca572cf88a1 and fixed in 6.5 with commit 5f151364b1da6bd217632fd4ee8cc24eaf66a497

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-2023-53553
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/hid/hid-hyperv.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/a7902cc5f5b9c95997017c8e309da760fb1deb6e
	https://git.kernel.org/stable/c/5f151364b1da6bd217632fd4ee8cc24eaf66a497