CVE-2026-77178

9.1 CRITICAL 0.3% exploit odds No fix listed Memory safety OS & kernel

What it is

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.

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of data tampering, service disruption.
Exploit odds: 0.3% chance of exploitation in the next 30 days (EPSS).
Fix: No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

2026-08-20 00:00 UTC ReservedThe CVE id was reserved by its CNA
2026-10-06 14:17 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-10-06 18:16 UTC Last updatedMost recent change to the record

Details

Published: 2026-10-06 14:17 UTC
Last modified: 2026-10-06 18:16 UTC
Exploit probability: 0.3% · EPSS, next 30 days
Weakness: CWE-787 · Out-of-bounds write
Record status: Awaiting Analysis

Attack profile CVSS 3.1 · 9.1

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: High
Availability: High

Raw vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

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References

NVD record · CVE.org record