Buffer overflow in IBM Powervm Hypervisor

CVE-2026-96266

IBM Power Systems Firmware FW1060.00 through FW1060.81 is affected by a vulnerability in host firmware configuration parsing. An attacker with authenticated service-level access to the FSP can write specially crafted configuration data to cause memory corruption in the host firmware boot stage during system IPL, compromising the host firmware boot stack and the hypervisor subsequently loaded by it. Successful exploitation results in a confidentiality, integrity, and availability impact to the managed system.

Vulnerability class: Buffer Overflow

Published .

CVSS v3 metric

CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-96266?
CVE-2026-96266 is a high-severity vulnerability in IBM Powervm Hypervisor, classified under Stack-based Buffer Overflow. CVSS score: 8.2/10. Published 2026-10-12.
How severe is CVE-2026-96266?
High severity. CVSS v3 base score is 8.2 out of 10.