CVE-2026-43466 is a high-severity vulnerability in the Linux kernel's mlx5e network driver related to DMA FIFO desynchronization during error completion queue entry (CQE) send queue (SQ) recovery. The flaw occurs because the recovery function resets the DMA FIFO consumer counter but not the producer counter, causing a mismatch that leads to unmapping stale DMA addresses. This issue can trigger kernel warnings and potentially cause denial of service due to improper DMA handling. The vulnerability has been fixed by removing the erroneous reset of the consumer counter during recovery.