Unauthenticated code execution via stack buffer overflow
Published Aug 20, 2026 · Updated Aug 20, 2026
Stack buffer overflow in IBM AIX 7.2 and 7.3 and PowerVM Virtual I/O Server 4.1 allows remote attackers to execute arbitrary code. IBM identifies an out-of-bounds write to a stack buffer but has not disclosed the affected component, protocol, request field, or faulty memory operation. No authentication or user interaction is required; successful exploitation executes code in the affected system's security context.
Summary
What happened
Stack buffer overflow in IBM AIX 7.2 and 7.3 and PowerVM Virtual I/O Server 4.1 allows remote attackers to execute arbitrary code. IBM identifies an out-of-bounds write to a stack buffer but has not disclosed the affected component, protocol, request field, or faulty memory operation. No authentication or user interaction is required; successful exploitation executes code in the affected system's security context.
The record
- CVE
- CVE-2026-17157
- Published
- Aug 20, 2026
- Updated
- Aug 20, 2026
- Vendor
- IBM
- Product
- AIX
- Classifications
- CWE-787, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 20, 2026CVE publishedPublication date reported by the CVE source.
- Aug 20, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=7.2
- Affected versionversion=7.3
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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