CVE-2026-77178 Memory corruption in n/a
Guest OS users can trigger an out-of-bounds write in the host OS via the PCNet network device model, potentially leading to code execution or privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-77178?
CVE-2026-77178 is a critical memory corruption vulnerability in n/a, published on 6 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-787
Which versions are affected by CVE-2026-77178?
How do I fix CVE-2026-77178?
No fix has been published for CVE-2026-77178 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-77178 being exploited?
There is no known exploitation of CVE-2026-77178 in the wild and no public exploit code.
Sources
Also known as GHSA-65c9-4f8q-72qc, UBUNTU-CVE-2026-77178.