linux-cve-announce - CVE-2025-38497: usb: gadget: configfs: Fix OOB read on empty string write

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Message-ID: <2025072818-CVE-2025-38497-b5c7@gregkh>
Date: Mon, 28 Jul 2025 13:22:39 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-38497: usb: gadget: configfs: Fix OOB read on empty string write

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

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

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

usb: gadget: configfs: Fix OOB read on empty string write

When writing an empty string to either 'qw_sign' or 'landingPage'
sysfs attributes, the store functions attempt to access page[l - 1]
before validating that the length 'l' is greater than zero.

This patch fixes the vulnerability by adding a check at the beginning
of os_desc_qw_sign_store() and webusb_landingPage_store() to handle
the zero-length input case gracefully by returning immediately.

The Linux kernel CVE team has assigned CVE-2025-38497 to this issue.


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

	Fixed in 6.1.147 with commit 2798111f8e504ac747cce911226135d50b8de468
	Fixed in 6.6.100 with commit 58bdd5160184645771553ea732da5c2887fc9bd1
	Fixed in 6.12.40 with commit 783ea37b237a9b524f1e5ca018ea17d772ee0ea0
	Fixed in 6.15.8 with commit 22b7897c289cc25d99c603f5144096142a30d897
	Fixed in 6.16 with commit 3014168731b7930300aab656085af784edc861f6

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-2025-38497
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/gadget/configfs.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/2798111f8e504ac747cce911226135d50b8de468
	https://git.kernel.org/stable/c/58bdd5160184645771553ea732da5c2887fc9bd1
	https://git.kernel.org/stable/c/783ea37b237a9b524f1e5ca018ea17d772ee0ea0
	https://git.kernel.org/stable/c/22b7897c289cc25d99c603f5144096142a30d897
	https://git.kernel.org/stable/c/3014168731b7930300aab656085af784edc861f6