Out-of-bounds Read in IBM Aix

CVE-2026-16866

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 an out-of-bounds read.

Vulnerability class: Buffer Overflow

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L.

Affected products

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

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

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

Frequently asked questions

What is CVE-2026-16866?: CVE-2026-16866 is a medium-severity vulnerability in IBM Aix, classified under Out-of-bounds Read. CVSS score: 4.8/10. Published 2026-08-19.
How severe is CVE-2026-16866?: Medium severity. CVSS v3 base score is 4.8 out of 10.