What is CVE-2026-19448?

CVE-2026-19448 is a medium-severity vulnerability in IBM Aix, classified under Use of Uninitialized Resource. CVSS score: 6.5/10. Published 2026-08-20.

How severe is CVE-2026-19448?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in IBM Aix

CVE-2026-19448

IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 A stack memory corruption vulnerability exists in the AIX IPsec ESP decapsulation handler. Successful exploitation may corrupt kernel stack state and cause a system crash, resulting in denial of service.

Published 2026-08-20 · last modified 2026-08-25.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H.

EPSS exploit prediction

EPSS: 0.002 (14.7th percentile), scored 2026-10-06.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 15th percentile — 14.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

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-2026-19448?: CVE-2026-19448 is a medium-severity vulnerability in IBM Aix, classified under Use of Uninitialized Resource. CVSS score: 6.5/10. Published 2026-08-20.
How severe is CVE-2026-19448?: Medium severity. CVSS v3 base score is 6.5 out of 10.