CVE-2026-19783 Vulnerabilities in IBM AIX and PowerVM VIOS

Medium 6.7 Published 20 Aug 2026 Updated 26 Aug 2026

A local attacker can exploit kernel memory corruption in IBM AIX and PowerVM VIOS via a crafted filesystem image to cause crashes or escalate privileges.

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

What is CVE-2026-19783?

CVE-2026-19783 is a medium-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 cause kernel memory corruption due to insufficient validation. A crafted filesystem image can trigger an out-of-bounds kernel-stack write during directory reads, causing a system crash or potentially enabling privilege escalation.

Weakness: CWE-787

Which versions are affected by CVE-2026-19783?

It affects 2 products.

Products include Ibm Aix, Ibm Vios.

How do I fix CVE-2026-19783?

No fix has been published for CVE-2026-19783 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-2026-19783 being exploited?

There is no known exploitation of CVE-2026-19783 in the wild and no public exploit code.

All Ibm Aix vulnerabilities

Sources

Also known as GHSA-5pf4-2499-w282.