Bug 2525445 (CVE-2026-80711)

Summary:	CVE-2026-80711 kernel: power: supply: max17040: handle missing status supplier
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
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 power supply subsystem, specifically within the MAX17040 fuel gauge driver. When the MAX17040 fuel gauge operates without a registered charger status supplier, the driver fails to properly handle this missing information. This oversight can result in userspace applications reading an uninitialized battery status value, leading to incorrect battery state reporting.	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 2026-08-28 07:45:21 UTC

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

power: supply: max17040: handle missing status supplier

MAX17040 does not report charger state itself, so the driver forwards
POWER_SUPPLY_PROP_STATUS to a supplier power supply. If no supplier is
registered, power_supply_get_property_from_supplier() returns -ENODEV and
leaves the output value untouched.

max17040_get_property() currently ignores that error and returns success,
so userspace can read an uninitialized status value from the battery power
supply. This happens on systems that use the fuel gauge without a charger
supplier relationship in firmware.

Return POWER_SUPPLY_STATUS_UNKNOWN when no supplier provides STATUS, and
propagate other supplier lookup errors.

Comment 1 gkamathe 2026-08-31 05:57:42 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026082808-CVE-2026-80711-67c8@gregkh/T