CVE-2026-96264

Firmware code execution via mailbox storage overflow

Published Oct 12, 2026 · Updated Oct 12, 2026

Mailbox overflow in IBM PowerVM Hypervisor FW1060.00 through FW1060.81 allows local users to execute host firmware code. Crafted service processor mailbox messages overflow host firmware runtime attribute storage. Authenticated service-level access to the FSP is required; execution grants full access to managed-system memory and hardware interfaces.

CVSS severity8.2
High
EPSS probability0.17%
Next 30 days · Oct 18, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Mailbox overflow in IBM PowerVM Hypervisor FW1060.00 through FW1060.81 allows local users to execute host firmware code. Crafted service processor mailbox messages overflow host firmware runtime attribute storage. Authenticated service-level access to the FSP is required; execution grants full access to managed-system memory and hardware interfaces.

The record

CVE
CVE-2026-96264
Published
Oct 12, 2026
Updated
Oct 12, 2026
Vendor
IBM
Product
PowerVM Hypervisor
Classifications
CWE-121, T1068
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Oct 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=FW1060.00 <=FW1060.81

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

IBM · PowerVM Hypervisorversion=FW1060.00 <=FW1060.81

Published CVSS scores

8.2IBMCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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