CVE-2026-16909

HIGH
Published Aug 19, 2026 Modified Aug 21, 2026 CWE-128

Description

IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a remote attacker to execute arbitrary code due to an off-by-one error in bounds checking.

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CVSS v3.1 Score

8.8
HIGH
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS — Exploit Prediction

0.0029
Probability of exploitation
0.21%
Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-128 CWE-128

Affected Products

Vendor Product
ibm vios
ibm vios
ibm vios
ibm aix
ibm aix
ibm aix
ibm aix

References

Frequently Asked Questions

What is CVE-2026-16909? +
IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a remote attacker to execute arbitrary code due to an off-by-one error in bounds checking. It has a CVSS v3.1 base score of 8.8 (HIGH).
How severe is CVE-2026-16909? +
CVE-2026-16909 has a CVSS v3.1 score of 8.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0029, placing it in the 0th percentile for exploitation probability.
What products are affected by CVE-2026-16909? +
CVE-2026-16909 affects products from ibm, specifically: aix, vios. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2026-16909? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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