Bug 2532525 (CVE-2026-89470)

Summary:	CVE-2026-89470 kernel: power: supply: cros_usbpd: Limit port counts to EC_USB_PD_MAX_PORTS
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:	akhatavk, aos-team-art-private, asdas, dpaolell, jdelft, jupierce, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, suppawar, vlaad, 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 `cros_usbpd-charger` driver. This driver, which manages USB power delivery, incorrectly processes port count information from an embedded controller. A malicious embedded controller could provide an exaggerated port count, leading to an out-of-bounds write and subsequent memory corruption. This vulnerability could allow an attacker to cause system instability or potentially gain unauthorized control of the system.	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 2026-09-11 23:40:29 UTC

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

power: supply: cros_usbpd: Limit port counts to EC_USB_PD_MAX_PORTS

Currently the cros_usbpd-charger driver probe iterates based on raw
charger port count returned by the embedded controller. The only check
is against the number of USB PD ports which the embedded controller
also defines. A malicious embedded controller could return an inaccurate
port count (up to 255) resulting in an out of bounds write and
subsequent memory corruption.

Update helper functions in cros_usbpd-charger to limit port counts to
EC_USB_PD_MAX_PORTS.

Comment 1 gkamathe 2026-09-15 08:43:42 UTC

Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89470.mbox