Out-of-Bounds Write Vulnerability in IBM AIX and PowerVM Products
CVE-2026-18842

8.4HIGH

Key Information:

Vendor

IBM
Status
Aix
Powervm ViOS
Vendor
CVE Published:
20 August 2026

What is CVE-2026-18842?

An out-of-bounds write vulnerability exists in IBM AIX versions 7.2 and 7.3, as well as the IBM PowerVM VIOS 4.1. This flaw potentially allows a local attacker to gain elevated privileges by manipulating memory allocations improperly, leading to unauthorized access and control over system resources. Organizations using these products should apply the necessary patches to safeguard against potential exploitation.

Affected Version(s)

AIX 7.2

AIX 7.3

PowerVM VIOS 4.1

References

https://www.ibm.com/support/pages/node/7283858
vendor-advisorypatch

CVSS V3.1

Score:
8.4
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

CVE-2026-14970, CVE-2026-15061, CVE-2026-15078, CVE-2026-15065, CVE-2026-15068 were reported to IBM by Oneconsult AG (https://oneconsult.com/).
.