CVE-2026-19437

Vulnerabilities in IBM AIX and PowerVM VIOS

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Published Aug 20, 2026 CVSS 3.1 · 8.1 High EPSS < 1% KEV · Not listed
Description
IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a remote attacker to execute arbitrary code due to a buffer overflow.

Analysis

AI-generated

Technical impact

The vulnerability is a buffer overflow that can be triggered remotely and allows an attacker to execute arbitrary code on IBM AIX 7.2, AIX 7.3, and PowerVM VIOS 4.1. Exploiting the flaw could give the attacker full system control, compromising confidentiality, integrity, and availability of the affected host.

Affected Systems

The flaw affects IBM AIX releases 7.2 and 7.3, as well as PowerVM VIOS 4.1. The affected AIX service packs include AIX 7.3 TL04SP2, AIX 7.3 TL03SP3, AIX 7.3 TL02SP5, and AIX 7.2 TL05 SP13. For VIOS the remediation levels are VIOS 4.1.2 4.1.2.20, VIOS 4.1.1 4.1.1.30, and VIOS 4.1.0 4.1.0.50.

Risk and Exploitability

The CVSS score of 8.1 indicates a high severity vulnerability. The EPSS score is not available, and the issue is not listed in the CISA KEV catalog, but the remote execution potential and lack of detection make it a significant risk. Exploitation requires an attacker to send a specially crafted request to the vulnerable system; no public exploit is currently documented, so the primary mitigation is to apply the IBM APARs and service or fix packs as soon as feasible.

Remediation

Vendor Solution

A.  APARS IBM has assigned the following APARs to this problem: AIX LevelAPARAvailability  SPKEY7.2.5IJ5956608/14/2026SP13key_w_apar7.3.2IJ5956508/14/2026SP05key_w_apar7.3.3IJ5956408/14/2026SP03key_w_apar7.3.4IJ59563 08/14/2026SP02key_w_apar VIOS LevelAPARAvailability SPKEY4.1.0IJ5956508/14/20264.1.0.50key_w_apar4.1.1IJ5956408/14/20264.1.1.30key_w_apar4.1.2IJ5956308/14/20264.1.2.20key_w_apar B.  FIXES IBM strongly recommends addressing the vulnerability now.  AIX and VIOS fixes are available and can be downloaded from Fix Central: https://www.ibm.com/support/fixcentral  An LPAR reboot is required to complete the SP/FP update. On AIX, Live Update can be used to avoid a reboot.  IBM has assigned the following AIX Service Packs (SPs) and VIOS Fix Packs (FPs) as the remediation levels for the published vulnerabilities. AIX Level Service PackAIX 7.3 TL04SP2AIX 7.3 TL03SP3AIX 7.3 TL02SP5AIX 7.2 TL05 SP13 PowerVM VIOS LevelFix PackVIOS 4.1.2 4.1.2.20VIOS 4.1.1 4.1.1.30VIOS 4.1.0  4.1.0.50 Note: These SPs/FPs are cumulative and include fixes for all previously published AIX/VIOS security vulnerabilities. They can be applied on top of any earlier affected level of the TL . Note: To apply these patches using nimsh secure, special steps must be taken as the protocol between master and client is updated to be more secure. Please read this article: https://www.ibm.com/support/pages/node/7283157 Note: For VIOS 4.1.0 and VIOS 4.1.1, additional steps are required to migrate to the latest Postgres15 after applying the 4.1.1.30 or 4.1.0.50 FPs above. Instructions to do that can be found here:                             4.1.0.50 post-update instructions: https://www.ibm.com/support/pages/node/7283819           4.1.1.30 post-update instructions: https://www.ibm.com/support/pages/node/7283823

OpenCVE Recommended Actions

  • Apply the latest IBM Service Pack or Fix Pack for the affected AIX or VIOS version from Fix Central and follow the installation procedure.
  • Reboot the LPAR after the update, or use AIX Live Update to avoid a reboot.
  • If using VIOS 4.1.0 or 4.1.1, complete the Postgres15 migration with the instructions provided by IBM.

Generated by OpenCVE AI on August 21, 2026 at 00:07 UTC.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}
Type Values Removed Values Added
First Time appeared Ibm vios
CPEs cpe:2.3:a:ibm:vios:*:*:*:*:*:*:*:*
cpe:2.3:o:ibm:aix:*:*:*:*:*:*:*:*
Vendors & Products Ibm vios
Type Values Removed Values Added
Description IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a remote attacker to execute arbitrary code due to a buffer overflow.
Title Vulnerabilities in IBM AIX and PowerVM VIOS
First Time appeared Ibm
Ibm aix
Ibm powervm Vios
Weaknesses CWE-787
CPEs cpe:2.3:a:ibm:aix:7.2.0:*:*:*:*:*:*:*
cpe:2.3:a:ibm:aix:7.2:*:*:*:*:*:*:*
cpe:2.3:a:ibm:aix:7.3.0:*:*:*:*:*:*:*
cpe:2.3:a:ibm:aix:7.3:*:*:*:*:*:*:*
cpe:2.3:a:ibm:powervm_vios:4.1.0:*:*:*:*:*:*:*
cpe:2.3:a:ibm:powervm_vios:4.1:*:*:*:*:*:*:*
Vendors & Products Ibm
Ibm aix
Ibm powervm Vios
References
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'}
Weaknesses

Sources

Status
PUBLISHED
Assigner
ibm
Published
Updated
Aug 27, 2026, 4:24 PM
Reserved
Aug 10, 2026, 12:48 PM

View source JSON

Updated
Aug 27, 2026, 4:15 PM

JSON

Status
Analyzed
Published
Aug 20, 2026, 10:17 PM
Modified
Oct 26, 2026, 10:10 AM

View source JSON

No data.

Updated
Aug 21, 2026, 1:00 AM

JSON