---
id: CVE-2026-10673
title: Out-of-bounds write in ADIN2111/ADIN1110 OA SPI Ethernet RX frame reassembly
summary: >-
  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 c…
severity: high
cvss: 8.3
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-787
  - CWE-125
vendor: zephyrproject
product: zephyr
affected:
  - zephyr >= 3.7.0 < 4.3.1
  - zephyr >= 4.4.0 < 4.4.1
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-07-15T18:00:59.180581Z'
exploitAvailable: true
published: '2026-07-15'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T22:10:16.094Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-10673'
references:
  - url: >-
      https://github.com/zephyrproject-rtos/zephyr/commit/158df8d088316cdae20816fc07703892280b2acb
    label: Fix commit 158df8d08831
  - url: >-
      https://github.com/zephyrproject-rtos/zephyr/commit/c98321cbfef23c0e3bdf043ccf6b421067c8d508
    label: Fix commit c98321cbfef2
  - url: >-
      https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-hm6v-4jh4-3qc4
    label: GHSA-hm6v-4jh4-3qc4
tags:
  - cve.org
  - exploit-available
epss: 0.00416
epssPercentile: 0.34339
ingestedAt: '2026-10-15T22:48:25.569Z'
---

## Overview

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.

## Affected

- `zephyr >= 3.7.0 < 4.3.1`
- `zephyr >= 4.4.0 < 4.4.1`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.