CVE-2026-18670: Vulnerabilities in IBM AIX and PowerVM VIOS

Q: What level of attacker access is required?

The issue is described as remotely exploitable; no local access requirement is stated.

Q: Are affected versions or configurations identified?

No affected version ranges, configuration prerequisites, or default-configuration status are provided in the available data.

Q: What is the potential security impact beyond service disruption?

The issue may also allow disclosure of sensitive information.

Published Aug 15, 2026

Updated

IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a remote attacker to cause a denial of service and potentially disclose sensitive information due to an integer underflow.

Affected Software

10 affected components

IBM AIX<=7.2

IBM AIX<=7.3

IBM PowerVM VIOS<=4.1

IBM VIOS>=4.1.0<4.1.0.50

IBM VIOS>=4.1.1.0<4.1.1.30

IBM VIOS>=4.1.2.0<4.1.2.20

IBM AIX>=7.2.5<=7.2.5.212

IBM AIX>=7.3.2<=7.3.2.5

IBM AIX>=7.3.3<=7.3.3.2

IBM AIX>=7.3.4<=7.3.4.1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 7.3 TL04SP2
Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 7.3 TL03SP3
Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 7.3 TL02SP5
Upgrade
Upgrade IBM PowerVM VIOS 4.1.2 to a version that resolves this vulnerability.
Fixed in 4.1.2.20
Upgrade
Upgrade IBM PowerVM VIOS 4.1.1 to a version that resolves this vulnerability.
Fixed in 4.1.1.30
Upgrade
Upgrade IBM PowerVM VIOS 4.1.0 to a version that resolves this vulnerability.
Fixed in 4.1.0.50
Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Patch IJ5956608
Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Patch IJ5956508
Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Patch IJ5956408
Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Patch IJ59563
Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Patch IJ5956508/14/2026
Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Patch IJ5956408/14/2026
Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Patch IJ5956308/14/2026
Operational
An LPAR reboot is required to complete the SP/FP update.
Operational
For VIOS 4.1.0 and VIOS 4.1.1, after applying the 4.1.0.50 or 4.1.1.30 FPs, perform the additional steps required to migrate to the latest Postgres15.

Event History

Aug 15, 2026

CVE Published

via IBM·12:00 AM

Data Sourced

via IBM·12:00 AM

DescriptionAffected Software

Aug 20, 2026

CVE Published

via MITRE·09:59 PM

Data Sourced

via MITRE·09:59 PM

RemedyDescriptionSeverityWeakness

Data Sourced

via NVD·10:17 PM

RemedyDescriptionSeverityWeaknessAffected Software

Parent advisories

This vulnerability appears in the following advisories.

IBM-7283858

Frequently Asked Questions

What level of attacker access is required?

The issue is described as remotely exploitable; no local access requirement is stated.

Are affected versions or configurations identified?

No affected version ranges, configuration prerequisites, or default-configuration status are provided in the available data.

What is the potential security impact beyond service disruption?

The issue may also allow disclosure of sensitive information.

CVE-2026-18670: Vulnerabilities in IBM AIX and PowerVM VIOS

Affected Software

Remediation

Event History

Parent advisories

Frequently Asked Questions

What level of attacker access is required?

Are affected versions or configurations identified?

What is the potential security impact beyond service disruption?

Company

Resources

Contact