CVE-2026-90280: phy: qcom: qmp-usb: Fix possible NULL-deref on early runtime suspend

CVE-2026-90280: phy: qcom: qmp-usb: Fix possible NULL-deref on early runtime suspend

[Greg Kroah-Hartman]

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

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

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

phy: qcom: qmp-usb: Fix possible NULL-deref on early runtime suspend

There is a small window where the runtime suspend callback may run
after pm_runtime_enable() and before pm_runtime_forbid(). In this
case, a crash occurs because runtime suspend/resume dereferences
qmp->phy pointer, which is not yet initialized:
        `if (!qmp->phy->init_count) {`

This can also happen if user re-enables runtime-pm via the sysfs
attribute before qmp phy is initialized.

Similarly to other qcom phy drivers, introduce a qmp->phy_initialized
variable that can be used to avoid relying on the possibly uninitialized
phy pointer.

The Linux kernel CVE team has assigned CVE-2026-90280 to this issue.


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

	Issue introduced in 6.6 with commit e464a3180a43b6596bd267f9f274e1793bfb8150 and fixed in 6.6.157 with commit 9b28287c5dea7650e6dd317591b9e82b6e145365
	Issue introduced in 6.6 with commit e464a3180a43b6596bd267f9f274e1793bfb8150 and fixed in 6.12.110 with commit f4e39ab1b2009a89c60e4cb9dbefb8140d405eff
	Issue introduced in 6.6 with commit e464a3180a43b6596bd267f9f274e1793bfb8150 and fixed in 6.18.52 with commit 5547fd950d6bf72de861b6934341e7bb0888640c
	Issue introduced in 6.6 with commit e464a3180a43b6596bd267f9f274e1793bfb8150 and fixed in 7.2.6 with commit 03455404fb6cbfd65842695df26739853fc1516b
	Issue introduced in 6.6 with commit e464a3180a43b6596bd267f9f274e1793bfb8150 and fixed in 7.3-rc1 with commit 142c5593379273264474f31d5956b1a0065cd576

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-2026-90280
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/phy/qualcomm/phy-qcom-qmp-usb.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/9b28287c5dea7650e6dd317591b9e82b6e145365
	https://git.kernel.org/stable/c/f4e39ab1b2009a89c60e4cb9dbefb8140d405eff
	https://git.kernel.org/stable/c/5547fd950d6bf72de861b6934341e7bb0888640c
	https://git.kernel.org/stable/c/03455404fb6cbfd65842695df26739853fc1516b
	https://git.kernel.org/stable/c/142c5593379273264474f31d5956b1a0065cd576