CVE-2026-18828

Received Received - Intake

Stack-Based Buffer Overflow in IBM AIX and PowerVM VIOS

Publication date: 2026-08-20

Last updated on: 2026-08-20

Assigner: IBM Corporation

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 a stack-based buffer overflow.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-08-20

Last Modified

2026-08-20

Generated

2026-08-21

AI Q&A

2026-08-21

EPSS Evaluated

N/A

NVD

CVE-2026-18828

EUVD

EUVD-2026-63742

Affected Vendors & Products

Vendor	Product	Version / Range
ibm	aix	From 7.2 (inc)
ibm	aix	From 7.3 (inc)
ibm	powervm_vios	From 4.1 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-787	The product writes data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

Executive Summary

IBM AIX 7.2, 7.3, and IBM PowerVM VIOS 4.1 are vulnerable to a denial of service attack due to a stack-based buffer overflow. This flaw could allow a remote attacker to crash the system by sending specially crafted input.

Impact Analysis

The vulnerability may cause system crashes, leading to downtime and potential loss of service. It could disrupt operations dependent on IBM AIX or PowerVM VIOS systems.

Compliance Impact

This vulnerability could lead to a denial of service, which may impact the availability of systems handling sensitive data. For GDPR, availability is a key principle, so disruptions could affect compliance. For HIPAA, availability of healthcare systems is critical, and such disruptions may risk compliance with access and integrity requirements.

Mitigation Strategies

Apply IBM-provided patches or updates for AIX 7.2, 7.3, and PowerVM VIOS 4.1 to address the stack-based buffer overflow issue. Monitor IBM security advisories for fixes and restrict remote access to vulnerable systems until patched.

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