Bug 2502465 (CVE-2026-63963)

Summary:	CVE-2026-63963 kernel: usb: typec: tcpm: validate VDO count in Discover Identity ACK handlers
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 USB Type-C subsystem. A malicious or malformed USB Type-C device could send an invalid Vendor Defined Object (VDO) count during the Discover Identity Acknowledgement (ACK) process. This improper validation could allow the device to read beyond the intended memory boundaries, potentially leading to information disclosure from the kernel.	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 2026-07-19 16:09:36 UTC

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

usb: typec: tcpm: validate VDO count in Discover Identity ACK handlers

Properly validate the count passed from a device when calling
svdm_consume_identity() or svdm_consume_identity_sop_prime() as the
device-controlled value could index off of the static arrays, which
could leak data.

Comment 1 Mauro Matteo Cascella 2026-07-21 11:10:17 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026071958-CVE-2026-63963-56d2@gregkh/T