CVE-2026-18822

Service interruption via unbounded directory-record parsing

Published Aug 20, 2026 · Updated Aug 20, 2026

Uncontrolled resource consumption in IBM AIX 7.2 and 7.3 and PowerVM VIOS 4.1 allows local users to interrupt service. The directory-record parser consumes resources without an enforced bound when it processes crafted records, but IBM has not identified the affected function. Exploitation requires high local privileges and can make the affected system unavailable without reported data disclosure or modification.

CVSS severity4.4
Medium
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in IBM AIX 7.2 and 7.3 and PowerVM VIOS 4.1 allows local users to interrupt service. The directory-record parser consumes resources without an enforced bound when it processes crafted records, but IBM has not identified the affected function. Exploitation requires high local privileges and can make the affected system unavailable without reported data disclosure or modification.

The record

CVE
CVE-2026-18822
Published
Aug 20, 2026
Updated
Aug 20, 2026
Vendor
IBM
Product
AIX
Classifications
CWE-400, T1499.004
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Aug 20, 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 privilegesadmin

What is affected?

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

Published CVSS scores

4.4IBMCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

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.

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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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499.004Application or System Exploitation

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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