CVE-2026-31729

About vulnerability

In the Linux kernel, the following vulnerability has been resolved: usb: typec: ucsi: validate connector number in ucsi_notify_common() The connector number extracted from CCI via UCSI_CCI_CONNECTOR() is a 7-bit field (0-127) that is used to index into the connector array in ucsi_connector_change(). However, the array is only allocated for the number of connectors reported by the device (typically 2-4 entries). A malicious or malfunctioning device could report an out-of-range connector number in the CCI, causing an out-of-bounds array access in ucsi_connector_change(). Add a bounds check in ucsi_notify_common(), the central point where CCI is parsed after arriving from hardware, so that bogus connector numbers are rejected before they propagate further. A flaw was found in the Linux kernel’s USB Type-C Unified Connector and Switch Interface (UCSI) module. A malicious or malfunctioning USB Type-C device could report an out-of-range connector number in the Configuration and Capability Information (CCI). This could lead to an out-of-bounds array access in the ucsi_connector_change() function, potentially causing system instability or a denial of service (DoS).

Live-patch status from KernelCare for each operating system.