What is CVE-2026-18840?

CVE-2026-18840 is a high-severity vulnerability in IBM Aix, classified under Untrusted Pointer Dereference. CVSS score: 8.2/10. Published 2026-08-20.

How severe is CVE-2026-18840?

High severity. CVSS v3 base score is 8.2 out of 10.

Vulnerability in IBM Aix

CVE-2026-18840

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.

CVSS v3 metric

CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.

Affected products

Ibm Aix — versions 7.2, 7.3
Ibm Powervm Vios — versions 4.1

Weakness classification (CWE)

CWE-822 — Untrusted Pointer Dereference

References

psirt@us.ibm.com (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-18840?: CVE-2026-18840 is a high-severity vulnerability in IBM Aix, classified under Untrusted Pointer Dereference. CVSS score: 8.2/10. Published 2026-08-20.
How severe is CVE-2026-18840?: High severity. CVSS v3 base score is 8.2 out of 10.