CVE-2026-16928: Vulnerabilities in IBM AIX and PowerVM VIOS

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 a heap-based buffer overflow.

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.

  1. Upgrade

    Upgrade IBM PowerVM VIOS to a version that resolves this vulnerability.

    Fixed in 4.1.0.50Patch key_w_apar7.3.2IJ5956508/14/2026SP05key_w_apar
  2. Upgrade

    Upgrade IBM PowerVM VIOS to a version that resolves this vulnerability.

    Fixed in 4.1.1.30Patch key_w_apar7.3.3IJ5956408/14/2026SP03key_w_apar
  3. Upgrade

    Upgrade IBM PowerVM VIOS to a version that resolves this vulnerability.

    Fixed in 4.1.2.20Patch key_w_apar4.1.2IJ5956308/14/2026
  4. Operational

    After applying the AIX Service Pack (SP) / PowerVM VIOS Fix Pack (FP) update, reboot the LPAR is required to complete the SP/FP update.

  5. Operational

    For VIOS 4.1.0.50 and 4.1.1.30 remediation, perform the additional required steps to migrate to the latest Postgres15 after applying the 4.1.1.30 or 4.1.0.50 FPs.

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·02:38 PM
Data Sourced
via MITRE·02:38 PM
RemedyDescriptionSeverityWeakness
Data Sourced
via NVD·03:17 PM
RemedyDescriptionSeverityWeaknessAffected Software

Parent advisories

This vulnerability appears in the following advisories.

Frequently Asked Questions

1

Which systems should be assessed for exposure?

Assess systems running IBM AIX and IBM PowerVM VIOS.

Company

Resources

Contact

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