CVE-2026-64278: i2c: imx-lpi2c: mark I2C adapter when hardware is powered down

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

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

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

i2c: imx-lpi2c: mark I2C adapter when hardware is powered down

On some i.MX platforms, certain I2C client drivers keep a periodic
workqueue which continues to trigger I2C transfers.

During system suspend/resume, there exists a time window between:
  - suspend_noirq and the system entering suspend
  - the system starting to resume and resume_noirq

In this window, the I2C controller resources such as clock and pinctrl
may already be disabled or not yet restored.

If a workqueue triggers an I2C transfer in this period, the driver
attempts to access I2C registers while the hardware resources are
unavailable, which may lead to system hang.

Mark the I2C adapter as suspended during noirq suspend and block new
transfers until resume, ensuring that I2C transfers are only issued
when hardware resources are available.

The Linux kernel CVE team has assigned CVE-2026-64278 to this issue.


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

	Issue introduced in 6.14 with commit 1ee867e465c1b0216ec02d4c0d334c4e89919cec and fixed in 6.18.39 with commit b2523f26979e0b5bd1422772176b2233fcd1f6d0
	Issue introduced in 6.14 with commit 1ee867e465c1b0216ec02d4c0d334c4e89919cec and fixed in 7.1.4 with commit 5800647d19d3f1f747fda4dc67e55d6afa6ee119
	Issue introduced in 6.14 with commit 1ee867e465c1b0216ec02d4c0d334c4e89919cec and fixed in 7.2-rc1 with commit 218cfe364b55b2768221629bd4a69ad190b7fbbc

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-2026-64278
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/i2c/busses/i2c-imx-lpi2c.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/b2523f26979e0b5bd1422772176b2233fcd1f6d0
	https://git.kernel.org/stable/c/5800647d19d3f1f747fda4dc67e55d6afa6ee119
	https://git.kernel.org/stable/c/218cfe364b55b2768221629bd4a69ad190b7fbbc