CVE-2026-17097

Platform outage via hypercall array-index validation failure

Published Aug 19, 2026 · Updated Aug 20, 2026

Improper array-index validation in IBM PowerVM Hypervisor allows local users to permanently hang a virtual processor via a hypercall. The hypervisor call interface fails to validate an array index supplied by a specially crafted call, leaving the processor unresponsive and sometimes writing a small amount of data to an uncontrolled memory location. Root access to a guest partition is required, and recovery from the hang requires a full platform re-IPL; the attacker cannot choose the memory-write target.

CVSS severity7.3
High
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper array-index validation in IBM PowerVM Hypervisor allows local users to permanently hang a virtual processor via a hypercall. The hypervisor call interface fails to validate an array index supplied by a specially crafted call, leaving the processor unresponsive and sometimes writing a small amount of data to an uncontrolled memory location. Root access to a guest partition is required, and recovery from the hang requires a full platform re-IPL; the attacker cannot choose the memory-write target.

The record

CVE
CVE-2026-17097
Published
Aug 19, 2026
Updated
Aug 20, 2026
Vendor
IBM
Product
PowerVM Hypervisor
Classifications
CWE-129, T1499
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Aug 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 20, 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 <=FW1060.80
  2. Affected versionversion=FW1110.00 <=FW1110.30
  3. Affected versionversion=FW1120.00
  4. Affected versionversion=FW950.00 <=FW950.H2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

IBM · PowerVM Hypervisorversion=FW1060.00 <=FW1060.80; version=FW1110.00 <=FW1110.30; version=FW1120.00; version=FW950.00 <=FW950.H2

Published CVSS scores

7.3IBMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:L/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.

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

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-129Improper Validation of Array Index
T1499Endpoint Denial of Service

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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