CVE-2026-68375: bnxt_en: Handle partially initialized auxiliary devices

From: Greg Kroah-Hartman <[email protected]>

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

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

bnxt_en: Handle partially initialized auxiliary devices

bnxt_aux_devices_init() calls auxiliary_device_init() before all fields
used by bnxt_aux_dev_release() are initialized.  After
auxiliary_device_init() succeeds, later errors must unwind with
auxiliary_device_uninit(), which invokes the release callback.

The release callback assumes that aux_priv->id, aux_priv->edev,
edev->net and edev->ulp_tbl are all populated.  If allocation fails
after auxiliary_device_init(), the release path can otherwise dereference
or clear partially initialized state.

Allocate and attach the bnxt_en_dev and ULP table before calling
auxiliary_device_init(), so the release callback only sees a fully
initialized auxiliary private object.  If auxiliary_device_init() itself
fails, free those allocations directly because device_initialize() has not
run and the release callback will not be invoked.

This issue was found by a static analysis checker and confirmed by manual
source review.

The Linux kernel CVE team has assigned CVE-2026-68375 to this issue.


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

	Issue introduced in 6.10 with commit 194fad5b27815ca80e832ac875c0026ff96fc243 and fixed in 7.1.6 with commit 4e1caa5fdd0dea36938fe39cceb1522e9d86c937
	Issue introduced in 6.10 with commit 194fad5b27815ca80e832ac875c0026ff96fc243 and fixed in 7.2-rc4 with commit 1cb8553c02e93e5a150cebd42f9ee3db0ece4707

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-2026-68375
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/net/ethernet/broadcom/bnxt/bnxt_ulp.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/4e1caa5fdd0dea36938fe39cceb1522e9d86c937
	https://git.kernel.org/stable/c/1cb8553c02e93e5a150cebd42f9ee3db0ece4707