Description
IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a local attacker to obtain sensitive information due to an out-of-bounds read.
Published: 2026-08-19
Score: 5.5 Medium
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Impact

The vulnerability allows a local attacker to read sensitive information through an out-of-bounds memory read, which corresponds to CWE-125. An attacker can access data that should be protected, but can not directly modify or execute code on the system. The moderate CVSS score of 5.5 reflects that the impact is limited to integrity and confidentiality without a privilege escalation or remote execution component.

Affected Systems

IBM AIX 7.2 and 7.3, as well as IBM PowerVM VIOS 4.1, are affected. For AIX, the relevant Service Packs include SP2 for 7.3 TL04, SP3 for 7.3 TL03, SP5 for 7.3 TL02, and SP13 for 7.2 TL05; for VIOS, the Fix Packs are FP4.1.2.20, FP4.1.1.30, and FP4.1.0.50. These releases are cumulative and cover all earlier security fixes.

Risk and Exploitability

The CVSS base score of 5.5 indicates moderate severity, and the EPSS score is not available, so the likelihood of exploitation is uncertain. The vulnerability is listed in the CISA KEV catalog as not included, suggesting no current weaponized exploit is known. Attackers would need local access to the affected system, and the issue arises from an out-of-bounds read that could leak confidential data; there is no remote exploitation pathway disclosed.

Generated by OpenCVE AI on August 19, 2026 at 22:38 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 applicable IBM AIX or VIOS update (APAR or Service Pack/Fix Pack) from Fix Central, targeting the latest cumulative release.
  • For AIX, apply the update using Live Update to avoid a reboot if possible; otherwise, perform an LPAR reboot to complete the update.
  • If your VIOS version is 4.1.0 or 4.1.1, follow IBM's post‑update steps to migrate to Postgres15 after applying FP4.1.0.50 or FP4.1.1.30.
  • When applying the patch with nimsh secure, follow IBM's guidance to update the protocol between master and client.

Generated by OpenCVE AI on August 19, 2026 at 22:38 UTC.

Tracking

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Advisories

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History

Wed, 19 Aug 2026 20:00:00 +0000

Type Values Removed Values Added
Description IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a local attacker to obtain sensitive information due to an out-of-bounds read.
Title Vulnerabilities in IBM AIX and PowerVM VIOS
First Time appeared Ibm
Ibm aix
Ibm powervm Vios
Weaknesses CWE-125
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': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: ibm

Published:

Updated: 2026-08-19T19:44:06.021Z

Reserved: 2026-07-24T04:52:35.193Z

Link: CVE-2026-16883

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-19T20:17:09.250

Modified: 2026-08-19T20:17:09.250

Link: CVE-2026-16883

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-19T22:45:06Z

Weaknesses