CVE-2026-18822: Vulnerabilities in IBM AIX and PowerVM VIOS

Q: Who can exploit this issue?

An attacker needs local access to an affected IBM AIX or IBM PowerVM VIOS system. The reported impact is denial of service through uncontrolled resource consumption while directory records are parsed.

Q: What is the expected impact of successful exploitation?

Successful exploitation can cause a denial of service by exhausting or consuming system resources during directory-record parsing.

Published Aug 15, 2026

Updated

IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a local attacker to cause a denial of service due to uncontrolled resource consumption when parsing directory records.

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.

Upgrade
Upgrade IBM PowerVM VIOS 4.1.0 to a version that resolves this vulnerability.
Fixed in 4.1.0.50Patch 4.1.0IJ5956508/14/20264.1.0.50key_w_apar
Upgrade
Upgrade IBM PowerVM VIOS 4.1.1 to a version that resolves this vulnerability.
Fixed in 4.1.1.30Patch 4.1.1IJ5956408/14/20264.1.1.30key_w_apar
Upgrade
Upgrade IBM PowerVM VIOS 4.1.2 to a version that resolves this vulnerability.
Fixed in 4.1.2.20Patch 4.1.2IJ5956308/14/20264.1.2.20key_w_apar
Operational
An LPAR reboot is required to complete the SP/FP update.
Operational
For VIOS 4.1.0 and VIOS 4.1.1, after applying the 4.1.0.50 or 4.1.1.30 FPs, complete the additional steps required to migrate to the latest Postgres15.

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·10:00 PM

Data Sourced

via MITRE·10:00 PM

RemedyDescriptionSeverityWeakness

Data Sourced

via NVD·10:17 PM

RemedyDescriptionSeverityWeaknessAffected Software

Dec 23, 58618

Event

via NVD·05:57 PM

Parent advisories

This vulnerability appears in the following advisories.

IBM-7283858

Frequently Asked Questions

Who can exploit this issue?

An attacker needs local access to an affected IBM AIX or IBM PowerVM VIOS system. The reported impact is denial of service through uncontrolled resource consumption while directory records are parsed.

What is the expected impact of successful exploitation?

Successful exploitation can cause a denial of service by exhausting or consuming system resources during directory-record parsing.

CVE-2026-18822: Vulnerabilities in IBM AIX and PowerVM VIOS

Affected Software

Remediation

Event History

Parent advisories

Frequently Asked Questions

Who can exploit this issue?

What is the expected impact of successful exploitation?

Company

Resources

Contact