CVE-2026-16821
High
Description
IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a local attacker to gain elevated privileges due to a format string vulnerability.
SeverityHigh
CVSS7.0
Exploit probability—
Product
Ibm Vios
PublishedAug 28, 2026
First seenAug 28, 2026
Weakness typeCWE-134CWE-134
How to fix
Update
- ibm vios4.1.0.50, 4.1.1.30, 4.1.2.20 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| ibm vios | 4.1.0 ≤ v < 4.1.0.50, 4.1.1 ≤ v < 4.1.1.30, 4.1.2.0 ≤ v < 4.1.2.20 | 4.1.0.50, 4.1.1.30, 4.1.2.20 |
| ibm aix | 7.2.5.0 ≤ v ≤ 7.2.5.212, 7.3.2 ≤ v ≤ 7.3.2.5, 7.3.3 ≤ v ≤ 7.3.3.2, 7.3.4 ≤ v ≤ 7.3.4.1 | — |
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