linux-cve-announce - CVE-2023-54279: MIPS: fw: Allow firmware to pass a empty env

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Message-ID: <2025123003-CVE-2023-54279-1dfa@gregkh>
Date: Tue, 30 Dec 2025 13:20:45 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-54279: MIPS: fw: Allow firmware to pass a empty env

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

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

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

MIPS: fw: Allow firmware to pass a empty env

fw_getenv will use env entry to determine style of env,
however it is legal for firmware to just pass a empty list.

Check if first entry exist before running strchr to avoid
null pointer dereference.

The Linux kernel CVE team has assigned CVE-2023-54279 to this issue.


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

	Fixed in 4.14.315 with commit f334b31625683418aaa2a335470eec950a95a254
	Fixed in 4.19.283 with commit 830181ddced5a05a711dc9da8043203b1f33a77e
	Fixed in 5.4.243 with commit 0f91290774c798199ba4b8df93de5c3156b5163d
	Fixed in 5.10.180 with commit 47e61cadc7a5f3dffd42d2d6fda81be163f1ab82
	Fixed in 5.15.111 with commit 3ef93b7bd9e042db240843f24a80e14da38c6830
	Fixed in 6.1.28 with commit a6b54af407873227caef6262e992f5422cdcb6ae
	Fixed in 6.2.15 with commit ad79828f133e98585ab2236cad04a55eb7141bbe
	Fixed in 6.3.2 with commit aeed787bbbbe1b842beec9a065a36c915226f704
	Fixed in 6.4 with commit ee1809ed7bc456a72dc8410b475b73021a3a68d5

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-2023-54279
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:
	arch/mips/fw/lib/cmdline.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/f334b31625683418aaa2a335470eec950a95a254
	https://git.kernel.org/stable/c/830181ddced5a05a711dc9da8043203b1f33a77e
	https://git.kernel.org/stable/c/0f91290774c798199ba4b8df93de5c3156b5163d
	https://git.kernel.org/stable/c/47e61cadc7a5f3dffd42d2d6fda81be163f1ab82
	https://git.kernel.org/stable/c/3ef93b7bd9e042db240843f24a80e14da38c6830
	https://git.kernel.org/stable/c/a6b54af407873227caef6262e992f5422cdcb6ae
	https://git.kernel.org/stable/c/ad79828f133e98585ab2236cad04a55eb7141bbe
	https://git.kernel.org/stable/c/aeed787bbbbe1b842beec9a065a36c915226f704
	https://git.kernel.org/stable/c/ee1809ed7bc456a72dc8410b475b73021a3a68d5