# CVE-2026-17504: IBM PowerVM Hypervisor integer underflow in partition firmware runtime

Source: https://junglewise.ai/threats/cve-2026-17504-ibm-powervm-hypervisor-fw1120-00-through-fw1120-01-fw1110-00  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-24. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-17504 · Severity: medium · CVSS 5.1 · Published 2026-09-24

IBM PowerVM Hypervisor is the virtualization layer that manages computing resources on IBM Power Systems. An attacker with administrator access to a virtual partition can crash the partition firmware by sending a specially crafted request, causing a denial of service and potential data corruption. This vulnerability affects multiple generations of PowerVM firmware.

Technologies: [IBM PowerVM Hypervisor](https://junglewise.ai/threats/technologies/powervm-hypervisor). Vendors: [IBM](https://junglewise.ai/threats/vendors/ibm).

## Quick answers

**Is CVE-2026-17504 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-17504 being exploited in the wild.

**How severe is CVE-2026-17504?** Medium severity, with a CVSS score of 5.1, published 24 September 2026.

**Which products and versions are affected?** IBM PowerVM Hypervisor FW1120.00-FW1120.01, FW1110.00-FW1110.31, FW1060.00-FW1060.81, FW950.00-FW950.H3.

**Is there a fix for CVE-2026-17504?** 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-2026-17504 attacked?** It is attacked with local access, in device firmware.

**Am I affected by CVE-2026-17504?** Check whether you run IBM PowerVM Hypervisor 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

An integer underflow vulnerability (CWE-191) in the partition firmware runtime allows an authenticated local attacker with root/administrator privileges to craft a malicious request that causes memory corruption and firmware crash. Attack requires root access to a partition and local network access to the firmware runtime. The vulnerability results in denial of service and potential memory corruption within the partition firmware.

## Affected products

- IBM PowerVM Hypervisor FW1120.00-FW1120.01, FW1110.00-FW1110.31, FW1060.00-FW1060.81, FW950.00-FW950.H3

## Timeline

- 2026-09-24: disclosed

## References

- [https://www.ibm.com/support/pages/node/7289130](https://www.ibm.com/support/pages/node/7289130)

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