linux-cve-announce - CVE-2025-40095: usb: gadget: f_rndis: Refactor bind path to use _

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Message-ID: <2025103016-CVE-2025-40095-fde5@gregkh>
Date: Thu, 30 Oct 2025 10:48:22 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-40095: usb: gadget: f_rndis: Refactor bind path to use __free()

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

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

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

usb: gadget: f_rndis: Refactor bind path to use __free()

After an bind/unbind cycle, the rndis->notify_req is left stale. If a
subsequent bind fails, the unified error label attempts to free this
stale request, leading to a NULL pointer dereference when accessing
ep->ops->free_request.

Refactor the error handling in the bind path to use the __free()
automatic cleanup mechanism.

The Linux kernel CVE team has assigned CVE-2025-40095 to this issue.


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

	Issue introduced in 2.6.27 with commit 45fe3b8e5342cd1ce307099459c74011d8e01986 and fixed in 6.1.158 with commit ef81226bb1f8b6e761cd0b53d2696e9c1bc955d1
	Issue introduced in 2.6.27 with commit 45fe3b8e5342cd1ce307099459c74011d8e01986 and fixed in 6.6.114 with commit 5f65c8ad8c7292ed7e3716343fcd590a51818cc3
	Issue introduced in 2.6.27 with commit 45fe3b8e5342cd1ce307099459c74011d8e01986 and fixed in 6.12.55 with commit 380353c3a92be7d928e6f973bd065c5b79755ac3
	Issue introduced in 2.6.27 with commit 45fe3b8e5342cd1ce307099459c74011d8e01986 and fixed in 6.17.5 with commit a8366263b7e5b663d7fb489d3a9ba1e2600049a6
	Issue introduced in 2.6.27 with commit 45fe3b8e5342cd1ce307099459c74011d8e01986 and fixed in 6.18-rc1 with commit 08228941436047bdcd35a612c1aec0912a29d8cd

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-2025-40095
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/function/f_rndis.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/ef81226bb1f8b6e761cd0b53d2696e9c1bc955d1
	https://git.kernel.org/stable/c/5f65c8ad8c7292ed7e3716343fcd590a51818cc3
	https://git.kernel.org/stable/c/380353c3a92be7d928e6f973bd065c5b79755ac3
	https://git.kernel.org/stable/c/a8366263b7e5b663d7fb489d3a9ba1e2600049a6
	https://git.kernel.org/stable/c/08228941436047bdcd35a612c1aec0912a29d8cd