Vulnerabilities in IBM AIX and PowerVM VIOS

Answer in brief

CVE-2026-16839 records a Unknown severity vulnerability in Vulnerabilities in IBM AIX and PowerVM VIOS. The current sources do not mark it as known exploited. The current feed maps IBM/AIX (generic), IBM/PowerVM VIOS (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 19, 2026Updated Aug 19, 2026Source checked Aug 19, 2026First seen by HOL Aug 19, 2026Material review Aug 19, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Not reported

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps IBM/AIX (generic), IBM/PowerVM VIOS (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
IBM/AIXgeneric	7.2 \|\| 7.3	Not reported
IBM/PowerVM VIOSgeneric	4.1	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for IBM/AIX, IBM/PowerVM VIOS.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Aug 19, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 19, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 19, 2026

Sources and claim methodology

Source referenceibm.com

Upstream source description

IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a remote attacker to obtain sensitive information due to an integer underflow in the IPv4 IP-options parser.

Quoted source text, attributed separately from HOL analysis.