Linux Kernel IOMMU Stream ID Handling Vulnerability in Tegra MGBE Controllers

A vulnerability exists in the Linux kernel's handling of IOMMU Stream IDs for Nvidia's Tegra MGBE controllers. The driver currently uses a hard-coded Stream ID for all controllers, which can lead to softirq timeouts and kernel panics when using controllers other than the one assigned to MGBE0. This issue has been observed to cause transmission queue timeouts and requires a manual reset of the network adapter.

Impact

Exploitation of this vulnerability leads to softirq timeouts and kernel panics, causing the system to stall and potentially disrupt network operations.