CVE-2026-16857: Vulnerabilities in IBM AIX and PowerVM VIOS

Q: Which IBM platforms are identified as affected?

The affected software listed is IBM AIX and IBM PowerVM VIOS.

Q: Does the issue require an attacker to have local access to the affected system?

The issue is described as remotely exploitable, so the attacker does not need local access according to the available 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 manipulate network traffic and DNS configuration due to improper authentication.

Affected Software

10 affected components

IBM AIX<=7.2

IBM AIX<=7.3

IBM PowerVM VIOS<=4.1

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

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

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade IBM PowerVM VIOS 4.1.0 to a version that resolves this vulnerability.
Fixed in 4.1.0.50Patch IJ5956508/14/2026
Upgrade
Upgrade IBM PowerVM VIOS 4.1.1 to a version that resolves this vulnerability.
Fixed in 4.1.1.30Patch IJ5956408/14/2026
Upgrade
Upgrade IBM PowerVM VIOS 4.1.2 to a version that resolves this vulnerability.
Fixed in 4.1.2.20Patch IJ5956308/14/2026
Compensating control
After applying the SP/FP update, perform an LPAR reboot is required to complete the SP/FP update (apply reboot to affected LPARs).
Operational
For VIOS 4.1.0 and VIOS 4.1.1: perform the additional steps required to migrate to the latest Postgres15 after applying the 4.1.0.50 or 4.1.1.30 FPs above.

Event History

Aug 15, 2026

CVE Published

via IBM·12:00 AM

Data Sourced

via IBM·12:00 AM

DescriptionAffected Software

Aug 19, 2026

CVE Published

via MITRE·07:38 PM

Data Sourced

via MITRE·07:38 PM

RemedyDescriptionSeverityWeakness

Data Sourced

via NVD·08:17 PM

RemedyDescriptionSeverityWeaknessAffected Software

Parent advisories

This vulnerability appears in the following advisories.

IBM-7283858

Frequently Asked Questions

Which IBM platforms are identified as affected?

The affected software listed is IBM AIX and IBM PowerVM VIOS.

Does the issue require an attacker to have local access to the affected system?

The issue is described as remotely exploitable, so the attacker does not need local access according to the available information.

CVE-2026-16857: Vulnerabilities in IBM AIX and PowerVM VIOS

Affected Software

Remediation

Event History

Parent advisories

Frequently Asked Questions

Which IBM platforms are identified as affected?

Does the issue require an attacker to have local access to the affected system?

Company

Resources

Contact