CVE-2026-16958: CWE-787 Out-of-bounds Write in IBM AIX
Description
CVE-2026-16958 is an out-of-bounds write vulnerability in IBM AIX versions 7.2 and 7.3, as well as IBM PowerVM VIOS 4.1. This flaw could allow a remote attacker to cause a denial of service condition. The vulnerability does not impact confidentiality or integrity but affects availability. The CVSS v3.1 base score is 6.5, indicating a medium severity level. No known exploits are reported in the wild. No patch or remediation details are provided in the available data.
CVSS v3.1
Score 6.5medium
Affected software
IBM
AIX
IBM
PowerVM VIOS
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
CVE-2026-16958 is a vulnerability classified as CWE-787 (Out-of-bounds Write) affecting IBM AIX 7.2, 7.3, and IBM PowerVM VIOS 4.1. It allows a remote attacker to cause a denial of service by writing outside the intended memory bounds. The attack vector is adjacent network (AV:A), requires low attack complexity (AC:L), no privileges (PR:N), and no user interaction (UI:N). The vulnerability impacts system availability but does not compromise confidentiality or integrity.
Potential Impact
Successful exploitation results in denial of service, impacting system availability. There is no impact on confidentiality or integrity. No known active exploitation has been reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, monitor IBM advisories for updates and consider applying any recommended temporary mitigations once published.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- ibm
- Date Reserved
- 2026-07-24T08:11:36.971Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a877782acd9273b492c5d33
Added to database: 08/20/2026, 21:54:10 UTC
Last enriched: 09/11/2026, 04:03:51 UTC
Last updated: 10/05/2026, 06:48:14 UTC
Views: 30
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