Buffer overflow in IBM Aix

CVE-2026-16886

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 write.

Vulnerability class: Buffer Overflow

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

Affected products

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

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

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

Frequently asked questions

What is CVE-2026-16886?: CVE-2026-16886 is a medium-severity vulnerability in IBM Aix, classified under Out-of-bounds Write. CVSS score: 4.3/10. Published 2026-08-19.
How severe is CVE-2026-16886?: Medium severity. CVSS v3 base score is 4.3 out of 10.