CVE-2026-63963

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.

This vulnerability is rated as Moderate severity for Red Hat Enterprise Linux because exploitation requires physical access to attach a specialized or compromised USB Type-C peripheral to the target host. In standard enterprise server environments, physical access controls significantly limit overall exposure. When an untrusted device negotiates power delivery identity parameters, out-of-bounds kernel memory reads can occur, exposing sensitive information without causing host disruption or granting unauthorized code execution.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.