CVE-2026-16877 Vulnerabilities in IBM AIX and PowerVM VIOS

High 8.8 Published 19 Aug 2026 Updated 20 Aug 2026

A remote authenticated attacker can execute arbitrary code on IBM AIX and PowerVM VIOS via a stack-based buffer overflow.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-16877?

CVE-2026-16877 is a high-severity memory corruption vulnerability in Ibm Aix, published on 19 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a remote authenticated attacker to execute arbitrary code due to a stack-based buffer overflow.

Weakness: CWE-121

Which versions are affected by CVE-2026-16877?

It affects 2 products.

Products include Ibm Aix, Ibm Vios.

How do I fix CVE-2026-16877?

No fix has been published for CVE-2026-16877 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-2026-16877 being exploited?

There is no known exploitation of CVE-2026-16877 in the wild and no public exploit code.

All Ibm Aix vulnerabilities

Sources

Also known as GHSA-gvpr-6m55-ffxw.