CVE-2026-16890

Information disclosure and service interruption via integer overflow

Published Aug 19, 2026 · Updated Aug 20, 2026

Integer overflow in IBM AIX 7.2 and 7.3 and PowerVM VIOS 4.1 allows local users to read sensitive information or interrupt service. IBM identifies the affected bos.mp64 fileset but has not published the overflowing calculation, its input, or the resulting read or failure path. Low-privilege local access and high-complexity conditions are required; impact is limited to data disclosure and service interruption.

CVSS severity3.6
Low
EPSS probability0.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in IBM AIX 7.2 and 7.3 and PowerVM VIOS 4.1 allows local users to read sensitive information or interrupt service. IBM identifies the affected bos.mp64 fileset but has not published the overflowing calculation, its input, or the resulting read or failure path. Low-privilege local access and high-complexity conditions are required; impact is limited to data disclosure and service interruption.

The record

CVE
CVE-2026-16890
Published
Aug 19, 2026
Updated
Aug 20, 2026
Vendor
IBM
Product
AIX
Classifications
CWE-190, CAPEC-92, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 19, 2026CVE publishedPublication date reported by the CVE source.
  2. 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.

  1. Affected versionversion=7.2
  2. Affected versionversion=7.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

IBM · AIXversion=7.2; version=7.3
IBM · PowerVM Virtual I/O Serverversion=4.1

Published CVSS scores

3.6IBMCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:L

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
CAPEC-92Forced Integer Overflow
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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