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CVE-2026-10673 is an out-of-bounds write vulnerability in the Zephyr RTOS ADIN2111/ADIN1110 10BASE-T1S/T1L Ethernet driver affecting releases 3.7.0 through 4.4.0. In OPEN Alliance SPI mode, the driver function eth_adin2111_oa_data_read() reassembles received Ethernet frames by copying device-supplied 64-byte chunks into a fixed static receive buffer, ctx->buf, sized by CONFIG_ETH_ADIN2111_BUFFER_SIZE, which defaults to 1524 bytes. The write cursor is advanced for each valid chunk, but the vulnerable code did not verify that the cumulative write position plus chunk length remained within the destination buffer. Because both the number of chunks and the per-chunk length are derived from received frame data, an attacker on the attached single-pair Ethernet segment can transmit an oversized frame that causes attacker-controlled bytes to be written past the end of the static buffer into adjacent driver or kernel memory. The cursor is only reset on a start-of-frame chunk, which contributes to the unsafe reassembly behavior. The flaw was introduced when OA SPI support was added and was corrected by adding a bounds check that drops oversized frames and resets the cursor before copying.
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