CVE-2026-10673 Out-of-bounds write in ADIN2111/ADIN1110 OA SPI Ethernet RX frame reassembly
An attacker on the Ethernet segment can trigger an out-of-bounds write in the ADIN2111/ADIN1110 driver, potentially causing code execution or denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-10673?
CVE-2026-10673 is a high-severity memory corruption vulnerability in Zephyrproject Zephyr, published on 15 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
The Zephyr ADIN2111/ADIN1110 10BASE-T1S/T1L Ethernet driver (drivers/ethernet/eth_adin2111.c) reassembles received Ethernet frames in OPEN Alliance (OA) SPI mode by copying device-supplied 64-byte data chunks into a fixed static buffer ctx->buf of size CONFIG_ETH_ADIN2111_BUFFER_SIZE (default 1524 bytes). In eth_adin2111_oa_data_read(), each valid chunk was memcpy'd into ctx->buf[ctx->scur] and the write cursor scur advanced, with no check that scur + len stayed within the buffer. The number of chunks (up to 255, from the BUFSTS RCA field) and the per-chunk length are taken entirely from the frame data received off the wire; the cursor is only reset on a start-of-frame chunk. An attacker on the single-pair Ethernet segment can therefore send a frame whose reassembled size exceeds the configured buffer, causing the driver's RX offload thread to write attacker-controlled frame bytes past the end of the static buffer into adjacent driver/kernel memory (up to roughly 14.8 KB in the worst case). This is a remotely/adjacently reachable out-of-bounds write (CWE-787) that can corrupt memory and cause denial of service or potentially code execution. The defect was introduced when OA SPI support was added (commit 0ca8b0756b1) and shipped in releases v3.7.0 through v4.4.0. The fix adds a bounds check that drops the oversized frame and resets the cursor before the copy.
Which versions are affected by CVE-2026-10673?
It affects 1 product.
Products include Zephyrproject Zephyr.
How do I fix CVE-2026-10673?
No fix has been published for CVE-2026-10673 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-10673 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-10673 exists.
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Sources
Also known as GHSA-hm6v-4jh4-3qc4.