CVE-2026-18842 Vulnerabilities in IBM AIX and PowerVM VIOS

High 8.4 Published 20 Aug 2026 Updated 22 Aug 2026

A local attacker can exploit an out-of-bounds write in IBM AIX and PowerVM VIOS to gain elevated privileges.

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-2026-18842?

CVE-2026-18842 is a high-severity memory corruption vulnerability in Ibm Aix, published on 20 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 local attacker to gain elevated privileges due to an out-of-bounds write.

Weakness: CWE-787

Which versions are affected by CVE-2026-18842?

It affects 2 products.

Products include Ibm Aix, Ibm Vios.

How do I fix CVE-2026-18842?

No fix has been published for CVE-2026-18842 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-2026-18842 being exploited?

There is no known exploitation of CVE-2026-18842 in the wild and no public exploit code.

All Ibm Aix vulnerabilities

Sources

Also known as GHSA-949r-65gv-mrq4.