Buffer Cleanup Issue in Linux Kernel Affecting Google Ethernet Driver

CVE-2026-23386

What is CVE-2026-23386?

In the Linux kernel, a flaw in the Google Ethernet Driver's handling of buffer cleanup in DQ-QPL mode has been detected. The issue arises during the execution of the gve_tx_clean_pending_packets function, which improperly utilizes the RDA buffer cleanup method. This mismanagement orchestrates two significant problems: First, the DMA array's shared storage with tx_qpl_buf_ids leads to the incorrect interpretation of buffer IDs as DMA addresses, resulting in errors when unmapping memory. Second, the num_bufs value in QPL mode, which can count significantly higher than the size of the DMA array, leads to potential out-of-bounds access warnings. As a solution, a more rigorous check for QPL mode has been recommended, to ensure proper buffer reclamation through the gve_free_tx_qpl_bufs function.

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