# CVE-2026-11885: IBM PowerVM Hypervisor buffer overflow in hypervisor call

Source: https://junglewise.ai/threats/cve-2026-11885-ibm-powervm-hypervisor-buffer-overflow-in-hypervisor-call  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-30. Updated: 2026-07-30  
License: CC BY 4.0 with a link back

CVE-2026-11885 · Severity: high · CVSS 8.4 · Published 2026-07-30

IBM PowerVM Hypervisor, the software responsible for managing virtual machines on IBM Power Systems, contains a vulnerability that could allow a malicious user on a guest operating system to crash the entire physical server. Additionally, an attacker could compromise the memory integrity of the system, potentially leading to unauthorized data modification or system instability. This impact affects the overall availability and reliability of the enterprise server environment.

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

## Quick answers

**Is CVE-2026-11885 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-11885 being exploited in the wild.

**How severe is CVE-2026-11885?** High severity, with a CVSS score of 8.4, published 30 July 2026.

**Which products and versions are affected?** IBM PowerVM Hypervisor FW1110.00 - FW1110.20, FW1060.00 - FW1060.71, FW950.00 - FW950.H1.

**Is there a fix for CVE-2026-11885?** 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-2026-11885 attacked?** It is attacked with local access, in device firmware.

**Am I affected by CVE-2026-11885?** 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

A classic buffer overflow (CWE-120) exists in the IBM PowerVM Hypervisor due to insufficient size checking during the processing of OS hypervisor calls. A local attacker with low privileges on a guest operating system can trigger this vulnerability by issuing a specially crafted hypervisor call. Successful exploitation can lead to a Denial of Service (DoS) by crashing the hypervisor or result in a compromise of system/OS memory integrity. The vulnerability has been addressed in firmware updates FW1110.30, FW1060.72/FW1060.80, and FW950.H2 depending on the specific Power System hardware generation.

## Affected products

- IBM PowerVM Hypervisor FW1110.00 - FW1110.20, FW1060.00 - FW1060.71, FW950.00 - FW950.H1

## Timeline

- 2026-07-21: disclosed: Initial publication by IBM
- 2026-07-30: advisory: NVD publication date

## References

- [https://www.ibm.com/support/pages/node/7280628](https://www.ibm.com/support/pages/node/7280628)

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