CVE-2026-16967: CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition
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.
AI Analysis
Technical Summary
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.
CVE-2026-16967: CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition
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
Affected software
IBM
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:*:*:*:*:*:*:*Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
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.
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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