CVE-2026-18840 HIGH

CVE-2026-18840: Vulnerabilities in IBM AIX and PowerVM VIOS

Vendor Ibm

Product AIX

Weakness CWE-822

Published August 20, 2026

Last update August 22, 2026

View on NVD All CVEs

CVSS base score

8.2/10

Attack vector Local

Attack complexity Low

Privileges required High

User interaction None

Confidentiality High

Integrity High

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

What the vulnerability does

01Description

IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a local attacker to execute arbitrary code due to improper validation of an attacker-controlled pointer.

Key dates

02Disclosure timeline

August 20, 2026 CVE published

August 22, 2026 Record updated

External resources

03References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2026-18840 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/822.html AskarLabs — CWE-822 write-up Untrusted Pointer Dereference

Identifiers

CVE CVE-2026-18840

CWE CWE-822

CVSS 8.2 / HIGH

Affected versions

Vendor Ibm

Product AIX

Affected 7.2

Vendor Ibm

Product AIX

Affected 7.3

Vendor Ibm

Product PowerVM VIOS

Affected 4.1