DMA Unmapping Issue in bnxt_en Driver for Linux Kernel

CVE-2025-38439

What is CVE-2025-38439?

A vulnerability in the bnxt_en driver of the Linux kernel affects the handling of DMA unmap operations. When transmitting XDP_REDIRECT packets, the driver fails to set the DMA unmap length properly, leading to the potential for incorrect memory management in systems with IOMMU enabled. This bug manifests as a kernel warning, indicating that the unmap length parameter was incorrectly set to zero, which could lead to adverse system behavior and performance issues.

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