---
id: CVE-2026-1679
title: >-
  The eswifi socket offload driver copies user-provided payloads into a fixed
  buffer without checking available space; oversized sends overflow
  `eswifi->buf`, corrupting kernel memory (CWE-120)
summary: >-
  The eswifi socket offload driver copies user-provided payloads into a fixed
  buffer without checking available space; oversized sends overflow
  `eswifi->buf`, corrupting kernel memory (CWE-120). Exploit requires local code
  that can call th…
severity: high
cvss: 7.3
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H'
cwe:
  - CWE-120
vendor: zephyrproject
product: zephyr
affected:
  - zephyr <= 4.3.0
published: '2026-03-28'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T23:17:36.300'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-1679'
references:
  - url: >-
      https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-qx3g-5g22-fq5w
    label: vulnerabilities@zephyrproject.org
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.00219
epssPercentile: 0.12309
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-04-01T13:51:46.860445Z'
ingestedAt: '2026-10-15T22:48:25.573Z'
---

## Overview

The eswifi socket offload driver copies user-provided payloads into a fixed buffer without checking available space; oversized sends overflow `eswifi->buf`, corrupting kernel memory (CWE-120). Exploit requires local code that can call the socket send API; no remote attacker can reach it directly.

## Affected

- `zephyr <= 4.3.0`

## Remediation

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