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CVE-2026-16821— Vulnerabilities in IBM AIX and PowerVM VIOS

Quick assessment

Affected
IBM AIX
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

IBM AIX是美国IBM公司的一款企业级Unix操作系统。 IBM AIX 7.2版本和7.3版本以及IBM PowerVM VIOS 4.1版本存在格式化字符串错误漏洞，该漏洞源于格式字符串漏洞，可能导致本地攻击者提升权限。

CVSS 7.0 · High EPSS 0.10% · P1

Possible ATT&CK Techniques 1 AI

T1548 · Abuse Elevation Control Mechanism

Affected Version Matrix 3

VendorProduct Version RangeStatus
IBM AIX 7.2 affected
7.3 affected
IBM PowerVM VIOS 4.1 affected
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I. Basic Information for CVE-2026-16821

Vulnerability Information
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Vulnerability Title
Vulnerabilities in IBM AIX and PowerVM VIOS
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
使用外部控制的格式字符串
Source: CVE Program / CVE List V5
Vulnerability Title
IBM AIX 格式化字符串错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
IBM AIX是美国IBM公司的一款企业级Unix操作系统。 IBM AIX 7.2版本和7.3版本以及IBM PowerVM VIOS 4.1版本存在格式化字符串错误漏洞，该漏洞源于格式字符串漏洞，可能导致本地攻击者提升权限。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
IBM AIX 7.2 cpe:2.3:a:ibm:aix:7.2:*:*:*:*:*:*:*
IBM PowerVM VIOS 4.1 cpe:2.3:a:ibm:powervm_vios:4.1:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-16821

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III. Intelligence Information for CVE-2026-16821

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Other References for CVE-2026-16821 (1)

Same Patch Batch · IBM · 2026-08-28 · 16 CVEs total

CVE-2026-19295 9.9 CRITICAL Langflow is affected by multiple remote code execution vulnerabilities due to insufficient
CVE-2026-18527 9.9 CRITICAL IBM Application Runtime Expert (ARE) for IBM i is vulnerable to a user gaining elevated pr
CVE-2026-19286 9.8 CRITICAL Langflow is affected by multiple remote code execution vulnerabilities due to insufficient
CVE-2026-3627 9.1 CRITICAL Multiple Vulnerabilities in IBM Concert Software
CVE-2026-18729 8.8 HIGH Langflow is affected by multiple remote code execution vulnerabilities due to insufficient
CVE-2026-18904 8.2 HIGH Langflow is affected by multiple authentication bypass, path traversal, authorization, and
CVE-2026-18891 8.2 HIGH Langflow is affected by multiple authentication bypass, path traversal, authorization, and
CVE-2026-18899 7.5 HIGH Langflow is affected by multiple authentication bypass, path traversal, authorization, and
CVE-2026-17203 7.5 HIGH IBM Application Runtime Expert (ARE) for IBM i is vulnerable to a user gaining elevated pr
CVE-2026-19294 6.4 MEDIUM Langflow is affected by multiple authentication bypass, path traversal, authorization, and
CVE-2026-3686 6.2 MEDIUM Vulnerabilities exists in IBM Cloud Pak for Data System
CVE-2025-64649 5.9 MEDIUM Multiple Vulnerabilities in IBM Concert Software
CVE-2025-36290 5.9 MEDIUM IBM Integrated Analytics System (IIAS) is affected by improper SSL/TLS certificate validat
CVE-2025-36271 5.9 MEDIUM IBM Integrated Analytics System (IIAS) is affected by a predictable salt vulnerability in
CVE-2026-18545 4.3 MEDIUM Langflow is affected by multiple authentication bypass, path traversal, authorization, and

IV. Related Vulnerabilities

Same product: AIX
Same vendor: IBM
Same weakness: CWE-134

V. Comments for CVE-2026-16821

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