Buffer overflow in IBM Powervm Hypervisor

CVE-2026-96262

IBM Power Systems Firmware FW1060.00 through FW1060.81 is affected by a vulnerability in the service processor mailbox interface. An attacker with authenticated service-level access to the FSP can send a specially crafted mailbox message to overflow host firmware runtime attribute storage, allowing arbitrary code to be executed in the host firmware runtime. This gives the attacker full access to the managed system's memory and hardware interfaces, resulting 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-2026-96262?
CVE-2026-96262 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-2026-96262?
High severity. CVSS v3 base score is 8.2 out of 10.