CVE-2026-16903 Vulnerabilities in IBM AIX and PowerVM VIOS

Critical 9.6 Published 19 Aug 2026 Updated 21 Aug 2026

Remote attackers can execute arbitrary code or cause denial of service via an out-of-bounds write in IBM AIX and PowerVM VIOS.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-16903?

CVE-2026-16903 is a critical memory corruption vulnerability in Ibm Aix, published on 19 Aug 2026. It can only be exploited from the same machine or local 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 attacker to execute arbitrary code or cause a denial of service due to an out-of-bounds write.

Weakness: CWE-787

Which versions are affected by CVE-2026-16903?

It affects 2 products.

Products include Ibm Aix, Ibm Vios.

How do I fix CVE-2026-16903?

No fix has been published for CVE-2026-16903 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-2026-16903 being exploited?

There is no known exploitation of CVE-2026-16903 in the wild and no public exploit code.

All Ibm Aix vulnerabilities

Sources

Also known as GHSA-c6cw-cvvr-xq54.