CVE-2026-19448: 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 A stack memory corruption vulnerability exists in the AIX IPsec ESP decapsulation handler. Successful exploitation may corrupt kernel stack state and cause a system crash, resulting in denial of service.

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 AIX to a version that resolves this vulnerability.

    Patch SPKEY7.2.5
  2. Upgrade

    Upgrade IBM AIX to a version that resolves this vulnerability.

    Patch IJ5956608
  3. Upgrade

    Upgrade IBM AIX to a version that resolves this vulnerability.

    Patch IJ5956508
  4. Upgrade

    Upgrade IBM AIX to a version that resolves this vulnerability.

    Patch IJ5956408
  5. Upgrade

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

    Patch IJ5956508
  6. Upgrade

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

    Patch IJ5956408
  7. Upgrade

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

    Patch IJ5956308
  8. Operational

    Reboot the LPAR to complete the SP/FP update.

  9. 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 4.1.1.30 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·10:04 PM
Data Sourced
via MITRE·10:04 PM
RemedyDescriptionSeverityWeakness
Data Sourced
via NVD·10:17 PM
RemedyDescriptionSeverityWeaknessAffected Software

Parent advisories

This vulnerability appears in the following advisories.

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