CVE-2026-17121 Vulnerabilities in IBM AIX and PowerVM VIOS

High 7.5 Published 20 Aug 2026 Updated 21 Aug 2026

A remote attacker can cause a denial of service in IBM AIX and PowerVM VIOS via uncontrolled recursion, requiring vendor patches.

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-2026-17121?

CVE-2026-17121 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 could allow a remote attacker to cause a denial of service due to uncontrolled recursion.

Weakness: CWE-674, CWE-400

Which versions are affected by CVE-2026-17121?

It affects 2 products.

Products include Ibm Aix, Ibm Vios.

How do I fix CVE-2026-17121?

No fix has been published for CVE-2026-17121 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-2026-17121 being exploited?

There is no known exploitation of CVE-2026-17121 in the wild and no public exploit code.

All Ibm Aix vulnerabilities

Sources

Also known as GHSA-xfxq-w327-fmf9.