From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-cve-announce@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@kernel.org>
Subject: CVE-2026-43422: usb: legacy: ncm: Fix NPE in gncm_bind
Date: Fri, 8 May 2026 16:22:31 +0200 [thread overview]
Message-ID: <2026050847-CVE-2026-43422-6042@gregkh> (raw)
From: Greg Kroah-Hartman <gregkh@kernel.org>
Description
===========
In the Linux kernel, the following vulnerability has been resolved:
usb: legacy: ncm: Fix NPE in gncm_bind
Commit 56a512a9b410 ("usb: gadget: f_ncm: align net_device lifecycle
with bind/unbind") deferred the allocation of the net_device. This
change leads to a NULL pointer dereference in the legacy NCM driver as
it attempts to access the net_device before it's fully instantiated.
Store the provided qmult, host_addr, and dev_addr into the struct
ncm_opts->net_opts during gncm_bind(). These values will be properly
applied to the net_device when it is allocated and configured later in
the binding process by the NCM function driver.
The Linux kernel CVE team has assigned CVE-2026-43422 to this issue.
Affected and fixed versions
===========================
Issue introduced in 6.18.17 with commit b62076e780a2121903ecf9ffdfb89c64647cb7da and fixed in 6.18.19 with commit be5738d19bed244ede84da45bc45395bcb1d99e0
Issue introduced in 6.19.7 with commit 188338c1827842f898761a939669cf345bdf07e2 and fixed in 6.19.9 with commit b23e86a3a15803c3dcb24701285f73e65099fdf9
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-2026-43422
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/legacy/ncm.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/be5738d19bed244ede84da45bc45395bcb1d99e0
https://git.kernel.org/stable/c/b23e86a3a15803c3dcb24701285f73e65099fdf9
https://git.kernel.org/stable/c/fde0634ad9856b3943a2d1a8cc8de174a63ac840
reply other threads:[~2026-05-08 14:26 UTC|newest]
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