What is CVE-2026-16827?

CVE-2026-16827 is a medium-severity vulnerability in IBM Aix, classified under Use of Uninitialized Resource. CVSS score: 5.9/10. Published 2026-08-19.

How severe is CVE-2026-16827?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Vulnerability in IBM Aix

CVE-2026-16827

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 the use of an uninitialized stack pointer.

Published 2026-08-19 · last modified 2026-08-24.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.004 (35.8th percentile), scored 2026-10-05.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 35.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001

Affected products

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

Weakness classification (CWE)

CWE-908 — Use of Uninitialized Resource

References

www.ibm.com/support/pages/node/7283858 (vendor-advisory, Patch, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-16827?: CVE-2026-16827 is a medium-severity vulnerability in IBM Aix, classified under Use of Uninitialized Resource. CVSS score: 5.9/10. Published 2026-08-19.
How severe is CVE-2026-16827?: Medium severity. CVSS v3 base score is 5.9 out of 10.