linux-cve-announce - CVE-2023-54104: mtd: rawnand: fsl_upm: Fix an off-by one test in fun_exec

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Message-ID: <2025122411-CVE-2023-54104-32e0@gregkh>
Date: Wed, 24 Dec 2025 14:07:01 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-54104: mtd: rawnand: fsl_upm: Fix an off-by one test in fun_exec_op()

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

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

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

mtd: rawnand: fsl_upm: Fix an off-by one test in fun_exec_op()

'op-cs' is copied in 'fun->mchip_number' which is used to access the
'mchip_offsets' and the 'rnb_gpio' arrays.
These arrays have NAND_MAX_CHIPS elements, so the index must be below this
limit.

Fix the sanity check in order to avoid the NAND_MAX_CHIPS value. This
would lead to out-of-bound accesses.

The Linux kernel CVE team has assigned CVE-2023-54104 to this issue.


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

	Issue introduced in 5.9 with commit 54309d65776755bcdb9dcf3744cd764fc1e254ea and fixed in 5.10.190 with commit 1f09d67d390647f83f8f9d26382b0daa43756e6f
	Issue introduced in 5.9 with commit 54309d65776755bcdb9dcf3744cd764fc1e254ea and fixed in 5.15.126 with commit eb7a5e4d14c8659cb97db6863316280e15f67209
	Issue introduced in 5.9 with commit 54309d65776755bcdb9dcf3744cd764fc1e254ea and fixed in 6.1.45 with commit f4b700c71802c81e6f9dce362ee7a0312c8377ba
	Issue introduced in 5.9 with commit 54309d65776755bcdb9dcf3744cd764fc1e254ea and fixed in 6.4.10 with commit 49e57caf967a969f6b955c88805f2d160910aa12
	Issue introduced in 5.9 with commit 54309d65776755bcdb9dcf3744cd764fc1e254ea and fixed in 6.5 with commit c6abce60338aa2080973cd95be0aedad528bb41f

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-2023-54104
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/mtd/nand/raw/fsl_upm.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/1f09d67d390647f83f8f9d26382b0daa43756e6f
	https://git.kernel.org/stable/c/eb7a5e4d14c8659cb97db6863316280e15f67209
	https://git.kernel.org/stable/c/f4b700c71802c81e6f9dce362ee7a0312c8377ba
	https://git.kernel.org/stable/c/49e57caf967a969f6b955c88805f2d160910aa12
	https://git.kernel.org/stable/c/c6abce60338aa2080973cd95be0aedad528bb41f