CVE-2026-77178Hinoki check available

Host memory corruption via PCNet receive write

Published Oct 6, 2026 · Updated Oct 6, 2026

An out-of-bounds write in Oracle VM VirtualBox before 7.2.8 allows guest OS users to corrupt host memory through an emulated PCNet adapter. The pcnetReceiveNoSync routine in DevPCNet.cpp writes beyond bounds while processing receive data for the AMD PCNet PCI II (Am79C970A) device. Exposure requires an x86 guest configured with that adapter; the supplied source record does not establish code execution, data disclosure, or a specific host failure.

CVSS severityUnavailable
Unscored
EPSS probability0.34%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

An out-of-bounds write in Oracle VM VirtualBox before 7.2.8 allows guest OS users to corrupt host memory through an emulated PCNet adapter. The pcnetReceiveNoSync routine in DevPCNet.cpp writes beyond bounds while processing receive data for the AMD PCNet PCI II (Am79C970A) device. Exposure requires an x86 guest configured with that adapter; the supplied source record does not establish code execution, data disclosure, or a specific host failure.

The record

CVE
CVE-2026-77178
Published
Oct 6, 2026
Updated
Oct 6, 2026
Vendor
OpenJDK
Product
Oracle VM VirtualBox
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=n/a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

OpenJDK · Oracle VM VirtualBoxversion=n/a

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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