CVE-2026-17028

Partition boot failure via out-of-bounds read

Published Aug 19, 2026 · Updated Aug 20, 2026

Out-of-bounds read in IBM PowerVM Hypervisor partition firmware allows remote attackers to block an iSCSI SAN network boot. IBM has not disclosed which partition-firmware routine reads beyond its intended buffer or which iSCSI input reaches it. Exposure requires same-network access while a partition is actively booting from an iSCSI SAN; only that partition's boot is interrupted.

CVSS severity6.5
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in IBM PowerVM Hypervisor partition firmware allows remote attackers to block an iSCSI SAN network boot. IBM has not disclosed which partition-firmware routine reads beyond its intended buffer or which iSCSI input reaches it. Exposure requires same-network access while a partition is actively booting from an iSCSI SAN; only that partition's boot is interrupted.

The record

CVE
CVE-2026-17028
Published
Aug 19, 2026
Updated
Aug 20, 2026
Vendor
IBM
Product
PowerVM Hypervisor
Classifications
CWE-125, CAPEC-540, T1499
Attack vector
adjacent
Privileges
unauthenticated

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 vectoradjacent
Required privilegesunauthenticated

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

6.5IBM CorporationCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
CAPEC-540Overread Buffers
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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