Description
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 uncontrolled resource consumption.
Published: 2026-08-19
Score: 7.5 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Impact

The vulnerability enables a remote attacker to trigger uncontrolled resource consumption, resulting in a denial of service that can affect the entire system’s availability. This flaw is based on improper resource management (CWE‑400) and can be exploited without needing privileged access, leading to service degradation or interruption.

Affected Systems

The affected products are IBM AIX (versions 7.2 and 7.3) and IBM PowerVM VIOS (version 4.1). IBM recommends applying the corresponding Service Packs for AIX (TL04 SP2, TL03 SP3, TL02 SP5, and TL05 SP13) and the relevant Fix Packs for VIOS (4.1.0.50, 4.1.1.30, and 4.1.2.20). These updates are cumulative and include fixes for all previously published security vulnerabilities.

Risk and Exploitability

The CVSS score of 7.5 indicates a high severity, while the EPSS score of 0.00549 indicates a very low exploitation probability; the vulnerability is not listed in the CISA KEV catalog. The attack is remote, likely exploiting a lack of resource limitation controls, and can cause an outage of services. The low EPSS score suggests that exploitation might require custom or zero‑day techniques, but the high severity still warrants prompt remediation.

Generated by OpenCVE AI on August 20, 2026 at 15:32 UTC.

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

  • Download and install the appropriate AIX Service Pack from IBM Fix Central, applying it to all affected AIX servers.
  • Install the matching VIOS Fix Pack for your version on all VIOS hosts; use nimsh secure following IBM’s updated protocol instructions if needed.
  • For VIOS 4.1.0 or 4.1.1, complete the post‑update migration to Postgres15 by following IBM’s instructions at the provided links.
  • After applying the updates, restart the LPAR or configure Live Update on AIX to finalize the changes and ensure system stability.

Generated by OpenCVE AI on August 20, 2026 at 15:32 UTC.

Tracking

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Advisories

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History

Thu, 20 Aug 2026 16:00:00 +0000

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

Thu, 20 Aug 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 19 Aug 2026 15:15:00 +0000

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 cause a denial of service due to uncontrolled resource consumption.
Title Vulnerabilities in IBM AIX and PowerVM VIOS
First Time appeared Ibm
Ibm aix
Ibm powervm Vios
Weaknesses CWE-400
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': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: ibm

Published:

Updated: 2026-08-19T15:17:55.583Z

Reserved: 2026-07-23T00:43:50.000Z

Link: CVE-2026-16690

cve-icon Vulnrichment

Updated: 2026-08-19T15:17:52.489Z

cve-icon NVD

Status : Analyzed

Published: 2026-08-19T15:16:56.887

Modified: 2026-08-20T15:54:08.000

Link: CVE-2026-16690

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-20T15:45:03Z

Weaknesses
  • CWE-400

    Uncontrolled Resource Consumption