# CVE-2026-17040: IBM AIX and PowerVM VIOS buffer overflow

Source: https://junglewise.ai/threats/cve-2026-17040-ibm-aix-and-powervm-vios-buffer-overflow  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-20. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-17040 · Severity: critical · CVSS 9.8 · Published 2026-08-20

IBM AIX 7.2/7.3 and PowerVM VIOS 4.1 are enterprise operating systems and virtualization platforms used to run critical business applications. A remote buffer overflow vulnerability in these systems could allow an attacker to execute arbitrary code with system privileges, potentially compromising all applications and data running on affected servers.

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

## Quick answers

**Is CVE-2026-17040 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-17040 being exploited in the wild.

**How severe is CVE-2026-17040?** Critical severity, with a CVSS score of 9.8, published 20 August 2026.

**Which products and versions are affected?** IBM Aix 7.2, 7.3; IBM PowerVM VIOS 4.1.

**Is there a fix for CVE-2026-17040?** 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.

**How is CVE-2026-17040 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-17040?** Check whether you run IBM Aix or IBM PowerVM VIOS at an affected version. 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.

## Technical details

CVE-2026-17040 is a remote buffer overflow vulnerability in IBM AIX 7.2, 7.3, and PowerVM VIOS 4.1. The vulnerability allows a network-based attacker to execute arbitrary code without requiring authentication or user interaction. The specific vulnerable component and root cause are not disclosed in the advisory, but the high CVSS score (9.8) indicates the vulnerability is easily exploitable and results in complete system compromise. Patches are available through IBM Service Packs and Fix Packs as part of cumulative maintenance packages.

## Affected products

- IBM AIX 7.2, 7.3
- IBM PowerVM VIOS 4.1

## Timeline

- 2026-08-20: disclosed

## References

- [https://www.ibm.com/support/pages/node/7283858](https://www.ibm.com/support/pages/node/7283858)

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