Heap Buffer Overflow Vulnerability in IBM AIX and PowerVM Products
CVE-2026-16855

5.5MEDIUM

Key Information:

Vendor

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

What is CVE-2026-16855?

A vulnerability exists in IBM AIX versions 7.2 and 7.3, as well as in IBM PowerVM VIOS 4.1, which could be exploited by a local attacker to cause a denial of service. The issue is rooted in a heap buffer overflow, which can potentially disrupt the system's normal operation. It is crucial for users to apply available patches and updates to mitigate the associated risks effectively.

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:
5.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
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/).
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