# CVE-2026-16894: IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a remote attacker to execute arbitrary code due to a stack buffer overflow.

Source: https://junglewise.ai/threats/cve-2026-16894-ibm-aix-7-2-and-7-3-and-ibm-powervm-vios-4-1-could-allow-a-remote  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-19  
License: CC BY 4.0 with a link back

CVE-2026-16894 · Severity: critical · CVSS 9.8 · Published 2026-08-19

IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a remote attacker to execute arbitrary code due to a stack buffer overflow.

Technologies: [IBM Aix](https://junglewise.ai/threats/technologies/aix), [IBM Vios](https://junglewise.ai/threats/technologies/vios). Vendors: [IBM](https://junglewise.ai/threats/vendors/ibm).

## Quick answers

**Is CVE-2026-16894 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-16894 being exploited in the wild.

**How severe is CVE-2026-16894?** Critical severity, with a CVSS score of 9.8, published 19 August 2026.

**Which products and versions are affected?** IBM Aix, IBM Vios. The advisory does not name versions.

**Is there a fix for CVE-2026-16894?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**Am I affected by CVE-2026-16894?** Check whether you run IBM Aix or IBM Vios. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- IBM Aix
- IBM Vios

## Related threats

- [IBM AIX format string vulnerability in privileged component](https://junglewise.ai/threats/cve-2026-16821-ibm-aix-format-string-vulnerability-in-privileged-component)
- [IBM AIX and PowerVM VIOS kernel memory corruption in directory reads](https://junglewise.ai/threats/cve-2026-19783-ibm-aix-and-powervm-vios-kernel-memory-corruption-in-directory)
- [IBM AIX and PowerVM VIOS cmdnim privilege escalation](https://junglewise.ai/threats/cve-2026-19449-ibm-aix-and-powervm-vios-cmdnim-privilege-escalation)
- [IBM AIX and PowerVM VIOS IPsec ESP stack memory corruption](https://junglewise.ai/threats/cve-2026-19448-ibm-aix-and-powervm-vios-ipsec-esp-stack-memory-corruption)
- [IBM AIX and PowerVM VIOS RPC DoS via malformed UDP packet](https://junglewise.ai/threats/cve-2026-19446-ibm-aix-and-powervm-vios-rpc-dos-via-malformed-udp-packet)