What is CVE-2026-16903?

CVE-2026-16903 is a critical-severity vulnerability in IBM Aix, classified under Out-of-bounds Write. CVSS score: 9.6/10. Published 2026-08-19.

How severe is CVE-2026-16903?

Critical severity. CVSS v3 base score is 9.6 out of 10.

Buffer overflow in IBM Aix

CVE-2026-16903

IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a remote attacker to execute arbitrary code or cause a denial of service due to an out-of-bounds write.

Vulnerability class: Buffer Overflow

CVSS v3 metric

CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:A/AC:L/PR:N/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
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-2026-16903?: CVE-2026-16903 is a critical-severity vulnerability in IBM Aix, classified under Out-of-bounds Write. CVSS score: 9.6/10. Published 2026-08-19.
How severe is CVE-2026-16903?: Critical severity. CVSS v3 base score is 9.6 out of 10.