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CVE-2026-16967: CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition

0
High
VulnerabilityCVE-2026-16967cvecve-2026-16967cwe-367
Published: 08/13/2026 (08/13/2026, 19:53:38 UTC)
Source: CVE Database V5
Vendor/Project: IBM

Description

CVE-2026-16967 is a high-severity vulnerability in IBM i versions 7.3, 7.4, 7.5, and 7.6. It involves a time-of-check to time-of-use (TOCTOU) race condition related to symbolic links, which could allow a remote authenticated attacker to gain unauthorized access to system objects. The vulnerability has a CVSS score of 8.5, indicating significant impact on confidentiality, integrity, and availability. No official patch or remediation guidance has been provided yet.

CVSS v3.1

Score 8.5high

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

Affected software

IBM

Affected versions
=7.6=7.5=7.4=7.3
CPE configurations (8)
cpe:2.3:a:ibm:i:7.6:*:*:*:*:*:*:*
cpe:2.3:a:ibm:i:7.6.0:*:*:*:*:*:*:*
cpe:2.3:a:ibm:i:7.5:*:*:*:*:*:*:*
cpe:2.3:a:ibm:i:7.5.0:*:*:*:*:*:*:*
cpe:2.3:a:ibm:i:7.4:*:*:*:*:*:*:*
cpe:2.3:a:ibm:i:7.4.0:*:*:*:*:*:*:*

AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 08/21/2026, 14:05:59 UTC

Technical Analysis

This vulnerability affects IBM i versions 7.3 through 7.6 and is classified as CWE-367, a TOCTOU race condition. The flaw arises when the system improperly handles symbolic links during the time between checking access permissions and using the referenced objects. This race condition can be exploited by a remote attacker with authentication to gain unauthorized access to system objects, potentially leading to full compromise of confidentiality, integrity, and availability of affected systems. The CVSS 3.1 vector indicates network attack vector, high attack complexity, low privileges required, no user interaction, and a scope change with high impact on all security properties. There is no vendor advisory or patch information available at this time.

Potential Impact

Successful exploitation allows a remote authenticated attacker to bypass access controls and gain unauthorized access to system objects on IBM i systems. This can lead to full compromise of confidentiality, integrity, and availability of the affected system components. The vulnerability affects multiple IBM i versions and poses a significant security risk.

Mitigation Recommendations

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a patch or official fix is released, organizations should monitor IBM advisories for updates. No specific temporary mitigations are provided in the available data.

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Technical Details

Data Version
5.2
Assigner Short Name
ibm
Date Reserved
2026-07-24T08:22:09.370Z
Cvss Version
3.1
State
PUBLISHED

Threat ID: 6a7e2503bf8831d539bec0de

Added to database: 08/13/2026, 20:11:47 UTC

Last enriched: 08/21/2026, 14:05:59 UTC

Last updated: 09/26/2026, 01:47:40 UTC

Views: 45

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