CVE-2026-16839: CWE-125 Out-of-bounds Read in IBM AIX
CVE-2026-16839 is a critical vulnerability in IBM AIX versions 7.2 and 7.3, as well as IBM PowerVM VIOS 4.1. It involves an integer underflow in the IPv4 IP-options parser that could allow a remote attacker to perform an out-of-bounds read. This flaw may lead to the exposure of sensitive information and has a high impact on integrity and availability.
AI Analysis
Technical Summary
This vulnerability (CWE-125) arises from an integer underflow in the IPv4 IP-options parser in IBM AIX 7.2, 7.3, and IBM PowerVM VIOS 4.1. The flaw allows a remote attacker to trigger an out-of-bounds read condition, potentially exposing sensitive information. The CVSS v3.1 score is 9.4 (critical), reflecting network attack vector, low attack complexity, no privileges or user interaction required, and impacts on confidentiality, integrity, and availability. No official remediation or patch information is currently available, and no known exploits are reported in the wild.
Potential Impact
Successful exploitation could allow a remote attacker to obtain sensitive information due to out-of-bounds memory reads caused by an integer underflow in the IPv4 IP-options parser. The vulnerability impacts confidentiality, integrity, and availability, making it critical in severity.
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 vendor-provided mitigation or temporary fix is currently documented.
CVE-2026-16839: CWE-125 Out-of-bounds Read in IBM AIX
Description
CVE-2026-16839 is a critical vulnerability in IBM AIX versions 7.2 and 7.3, as well as IBM PowerVM VIOS 4.1. It involves an integer underflow in the IPv4 IP-options parser that could allow a remote attacker to perform an out-of-bounds read. This flaw may lead to the exposure of sensitive information and has a high impact on integrity and availability.
CVSS v3.1
Score 9.4critical
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 (CWE-125) arises from an integer underflow in the IPv4 IP-options parser in IBM AIX 7.2, 7.3, and IBM PowerVM VIOS 4.1. The flaw allows a remote attacker to trigger an out-of-bounds read condition, potentially exposing sensitive information. The CVSS v3.1 score is 9.4 (critical), reflecting network attack vector, low attack complexity, no privileges or user interaction required, and impacts on confidentiality, integrity, and availability. No official remediation or patch information is currently available, and no known exploits are reported in the wild.
Potential Impact
Successful exploitation could allow a remote attacker to obtain sensitive information due to out-of-bounds memory reads caused by an integer underflow in the IPv4 IP-options parser. The vulnerability impacts confidentiality, integrity, and availability, making it critical in severity.
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 vendor-provided mitigation or temporary fix is currently documented.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- ibm
- Date Reserved
- 2026-07-24T02:59:13.055Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a86098facd9273b498b4bf7
Added to database: 08/19/2026, 19:52:47 UTC
Last enriched: 08/19/2026, 20:23:32 UTC
Last updated: 08/19/2026, 22:16:30 UTC
Views: 4
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