CVE-2026-68464: mmc: sdhci-esdhc-imx: disable irq during suspend to fix unhandled interrupt

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

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

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

mmc: sdhci-esdhc-imx: disable irq during suspend to fix unhandled interrupt

When using WIFI out-of-band wakeup, an "irq xxx: nobody cared" warning
occurs. This happens because the usdhc interrupt is not disabled during
system suspend when device_may_wakeup() returns false.

The sequence of events leading to this issue:
1. System enters suspend without disabling usdhc interrupt
(because device_may_wakeup() returns false for usdhc device)
2. WIFI out-of-band wakeup triggers system resume via GPIO interrupt
3. WIFI sends a Card interrupt before usdhc has fully resumed
4. usdhc is still in runtime suspend state and cannot handle the
interrupt properly
5. The unhandled interrupt triggers "nobody cared" warning

Fix this by unconditionally disabling the usdhc interrupt during suspend
and re-enabling it during resume, regardless of the wakeup capability.
This ensures no interrupts are processed during the suspend/resume
transition.

The Linux kernel CVE team has assigned CVE-2026-68464 to this issue.


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

	Issue introduced in 6.16 with commit 676a83855614635af3bf31ad3f8fec4031f81354 and fixed in 6.18.40 with commit 4f96903e2fd228aa96013372402d650f6dbe5cb3
	Issue introduced in 6.16 with commit 676a83855614635af3bf31ad3f8fec4031f81354 and fixed in 7.1.5 with commit 9bf4ee05a1109d889de9151ee78bd80293923f70
	Issue introduced in 6.16 with commit 676a83855614635af3bf31ad3f8fec4031f81354 and fixed in 7.2-rc4 with commit 9d87eaf985cef9581b6ed99b461b38e8cd666480

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-2026-68464
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/mmc/host/sdhci-esdhc-imx.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/4f96903e2fd228aa96013372402d650f6dbe5cb3
	https://git.kernel.org/stable/c/9bf4ee05a1109d889de9151ee78bd80293923f70
	https://git.kernel.org/stable/c/9d87eaf985cef9581b6ed99b461b38e8cd666480