CVE-2026-19446 Vulnerabilities in IBM AIX and PowerVM VIOS

High 7.5 Published 20 Aug 2026 Updated 21 Aug 2026

A remote unauthenticated attacker can cause complete system unavailability in IBM AIX and PowerVM VIOS by sending crafted UDP packets to an RPC service.

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-2026-19446?

CVE-2026-19446 is a high-severity denial of service vulnerability in Ibm Aix, published on 20 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 allows a remote unauthenticated attacker can send a crafted UDP packet to a reachable RPC service, resulting in complete system unavailability and requiring an LPAR restart.

Weakness: CWE-400

Which versions are affected by CVE-2026-19446?

It affects 2 products.

Products include Ibm Aix, Ibm Vios.

How do I fix CVE-2026-19446?

No fix has been published for CVE-2026-19446 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-19446 being exploited?

There is no known exploitation of CVE-2026-19446 in the wild and no public exploit code.

All Ibm Aix vulnerabilities

Sources

Also known as GHSA-5x8c-w6hj-rjr7.