---
id: CVE-2026-77178
title: >-
  Oracle VM VirtualBox before 7.2.8 allows guest OS users to cause an
  out-of-bounds write in the host OS in pcnetReceiveNoSync in DevPCNet.cpp in
  the PCNet (Am79C970A) network device model.
summary: >-
  Oracle VM VirtualBox before 7.2.8 allows guest OS users to cause an
  out-of-bounds write in the host OS in pcnetReceiveNoSync in DevPCNet.cpp in
  the PCNet (Am79C970A) network device model.
severity: critical
cvss: 9.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H'
cwe:
  - CWE-787
published: '2026-10-06'
updated: '2026-10-06'
sourceUpdated: '2026-10-06T18:16:55.970'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-77178'
references:
  - url: 'https://gist.github.com/entropy1337/cd0d5b368445d20c43aca2590b313892'
    label: cve@mitre.org
  - url: 'https://www.oracle.com/'
    label: cve@mitre.org
  - url: 'https://www.virtualbox.org/wiki/Download_Old_Builds_7_0'
    label: cve@mitre.org
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-10-06T17:32:27.645112Z'
ingestedAt: '2026-10-06T14:00:19.140Z'
epss: 0.00335
epssPercentile: 0.26673
---

## Overview

Oracle VM VirtualBox before 7.2.8 allows guest OS users to cause an out-of-bounds write in the host OS in pcnetReceiveNoSync in DevPCNet.cpp in the PCNet (Am79C970A) network device model.

## Remediation

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