CVE-2026-16849: Vulnerabilities in IBM AIX and PowerVM VIOS

Q: Which IBM products should be included in triage?

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

Q: When was this vulnerability published, and has its record changed since publication?

It was published on 2026-08-15 and was also last modified on 2026-08-15.

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 due to an improper check for an array index boundary.

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 to a version that resolves this vulnerability.
Fixed in 4.1.0.50
Upgrade
Upgrade IBM PowerVM VIOS to a version that resolves this vulnerability.
Fixed in 4.1.1.30Patch key_w_apar4.1.1IJ5956408/14/20264.1.1.30
Upgrade
Upgrade IBM PowerVM VIOS to a version that resolves this vulnerability.
Fixed in 4.1.2.20Patch key_w_apar4.1.2IJ5956308/14/20264.1.2.20
Operational
To complete the SP/FP update, reboot the LPAR.
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.

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·07:36 PM

Data Sourced

via MITRE·07:36 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 products should be included in triage?

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

When was this vulnerability published, and has its record changed since publication?

It was published on 2026-08-15 and was also last modified on 2026-08-15.

CVE-2026-16849: Vulnerabilities in IBM AIX and PowerVM VIOS

Affected Software

Remediation

Event History

Parent advisories

Frequently Asked Questions

Which IBM products should be included in triage?

When was this vulnerability published, and has its record changed since publication?

Company

Resources

Contact