CVE-2026-19783

System crash or privilege escalation via kernel-stack write

Published Aug 20, 2026 · Updated Aug 20, 2026

Out-of-bounds write in IBM AIX 7.2 and 7.3 and PowerVM VIOS 4.1 allows local users to corrupt kernel memory via a crafted filesystem image. During directory reads, insufficient validation lets crafted filesystem metadata drive an out-of-bounds write to the kernel stack. Reaching the flaw requires local high privileges and access to present the image; exploitation crashes the system and can enable privilege escalation.

CVSS severity6.7
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in IBM AIX 7.2 and 7.3 and PowerVM VIOS 4.1 allows local users to corrupt kernel memory via a crafted filesystem image. During directory reads, insufficient validation lets crafted filesystem metadata drive an out-of-bounds write to the kernel stack. Reaching the flaw requires local high privileges and access to present the image; exploitation crashes the system and can enable privilege escalation.

The record

CVE
CVE-2026-19783
Published
Aug 20, 2026
Updated
Aug 20, 2026
Vendor
OpenBMC Project
Product
AIX
Classifications
CWE-787, T1068, 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?

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

Published CVSS scores

6.7IBMCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/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.

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1068Exploitation for Privilege Escalation
T1499.004Application or System Exploitation

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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