Bug 2507032 (CVE-2026-64278)

Summary:	CVE-2026-64278 kernel: i2c: imx-lpi2c: mark I2C adapter when hardware is powered down
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	unspecified	CC:	rhel-process-autobot, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in the Linux kernel's i2c: imx-lpi2c driver. During system suspend and resume operations, certain I2C client drivers may attempt to perform I2C transfers while the underlying hardware resources are temporarily unavailable. This can occur because the I2C adapter is not properly marked as suspended, allowing transfers to be initiated at an inappropriate time. The consequence of this vulnerability is a system hang, which can lead to a denial of service.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-07-25 10:01:28 UTC

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.

Comment 1 Mauro Matteo Cascella 2026-07-28 15:45:32 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026072501-CVE-2026-64278-9f7c@gregkh/T