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CVE-2026-19783: CWE-787 Out-of-bounds Write in IBM AIX

0
Medium
VulnerabilityCVE-2026-19783cvecve-2026-19783cwe-787
Published: 08/20/2026 (08/20/2026, 22:04:49 UTC)
Source: CVE Database V5
Vendor/Project: IBM
Product: AIX

Description

CVE-2026-19783 is an out-of-bounds write vulnerability in IBM AIX 7.2, 7.3, and IBM PowerVM VIOS 4.1. It allows a local attacker to cause kernel memory corruption by exploiting insufficient validation during directory reads of a crafted filesystem image. This can lead to a system crash or potentially privilege escalation.

CVSS v3.1

Score 6.7medium

Attack Vector
Local
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Affected software

IBM

AIX

Affected versions
=7.2=7.3

IBM

PowerVM VIOS

Affected versions
=4.1
Ibmmore threats →ai
ibm/aix
pkg:rpm/ibm/aix
Affected versions
=7.2=7.3
Ibmmore threats →ai
ibm/powervm_vios
pkg:rpm/ibm/powervm_vios
Affected versions
=4.1
CPE configurations (6)
cpe:2.3:a:ibm:aix:7.2:*:*:*:*:*:*:*
cpe:2.3:a:ibm:aix:7.2.0:*:*:*:*:*:*:*
cpe:2.3:a:ibm:aix:7.3:*:*:*:*:*:*:*
cpe:2.3:a:ibm:aix:7.3.0:*:*:*:*:*:*:*
cpe:2.3:a:ibm:powervm_vios:4.1:*:*:*:*:*:*:*
cpe:2.3:a:ibm:powervm_vios:4.1.0:*:*:*:*:*:*:*

Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.

AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 09/11/2026, 03:47:42 UTC

Technical Analysis

IBM AIX versions 7.2 and 7.3, along with IBM PowerVM VIOS 4.1, contain a vulnerability (CWE-787) where insufficient validation during directory reads allows a crafted filesystem image to trigger an out-of-bounds write to the kernel stack. This memory corruption can cause a system crash or enable privilege escalation by a local attacker.

Potential Impact

A local attacker with high privileges can exploit this vulnerability to corrupt kernel memory, potentially causing a denial of service (system crash) or escalating privileges. The CVSS 3.1 base score is 6.7, indicating a medium severity with high impact on confidentiality, integrity, and availability.

Mitigation Recommendations

No official patch or remediation information is provided. Patch status is not yet confirmed — check IBM's vendor advisory for current remediation guidance before taking action.

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Technical Details

Data Version
5.2
Assigner Short Name
ibm
Date Reserved
2026-08-13T18:05:41.213Z
Cvss Version
3.1
State
PUBLISHED

Threat ID: 6a877e39acd9273b493410ae

Added to database: 08/20/2026, 22:22:49 UTC

Last enriched: 09/11/2026, 03:47:42 UTC

Last updated: 10/05/2026, 06:48:15 UTC

Views: 85

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