CVE-2026-18828: CWE-787 Out-of-bounds Write in IBM AIX
CVE-2026-18828 is a medium severity vulnerability affecting IBM AIX versions 7.2 and 7.3, as well as IBM PowerVM VIOS 4.1. It involves a stack-based buffer overflow that could be triggered remotely, potentially causing a denial of service condition. There is no confirmed patch or official remediation available at this time. No known exploits are reported in the wild.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-18828) is an out-of-bounds write (CWE-787) in IBM AIX 7.2, 7.3, and IBM PowerVM VIOS 4.1. It allows a remote attacker to cause a denial of service via a stack-based buffer overflow. The CVSS 3.1 base score is 5.4, reflecting a medium severity with attack vector as adjacent network, low attack complexity, no privileges required, no user interaction, and impact limited to availability loss. No vendor advisory or patch information is currently available.
Potential Impact
Successful exploitation could cause a denial of service on affected systems due to a stack-based buffer overflow. Confidentiality and integrity impacts are not indicated. The vulnerability can be triggered remotely without authentication or user interaction, but requires adjacency to the network.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, monitor IBM advisories for updates. No temporary or workaround fixes are documented.
CVE-2026-18828: CWE-787 Out-of-bounds Write in IBM AIX
Description
CVE-2026-18828 is a medium severity vulnerability affecting IBM AIX versions 7.2 and 7.3, as well as IBM PowerVM VIOS 4.1. It involves a stack-based buffer overflow that could be triggered remotely, potentially causing a denial of service condition. There is no confirmed patch or official remediation available at this time. No known exploits are reported in the wild.
CVSS v3.1
Score 5.4medium
Affected software
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.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-18828) is an out-of-bounds write (CWE-787) in IBM AIX 7.2, 7.3, and IBM PowerVM VIOS 4.1. It allows a remote attacker to cause a denial of service via a stack-based buffer overflow. The CVSS 3.1 base score is 5.4, reflecting a medium severity with attack vector as adjacent network, low attack complexity, no privileges required, no user interaction, and impact limited to availability loss. No vendor advisory or patch information is currently available.
Potential Impact
Successful exploitation could cause a denial of service on affected systems due to a stack-based buffer overflow. Confidentiality and integrity impacts are not indicated. The vulnerability can be triggered remotely without authentication or user interaction, but requires adjacency to the network.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, monitor IBM advisories for updates. No temporary or workaround fixes are documented.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- ibm
- Date Reserved
- 2026-08-04T13:58:07.119Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a877ac7acd9273b493025f5
Added to database: 08/20/2026, 22:08:07 UTC
Last enriched: 08/20/2026, 22:22:51 UTC
Last updated: 08/20/2026, 22:22:51 UTC
Views: 4
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