A flaw was found in dhcp-server. A remote attacker with network access to the OMAPI (Open Management Application Programming Interface) port, especially if not secured with TSIG (Transaction Signature) key authentication, could send a specially crafted lease creation request. This request, containing an overly long InfiniBand MAC address, triggers a buffer overflow in the `print_hw_addr()` function. Successful exploitation leads to a persistent denial of service (DoS), causing the `dhcpd` service to crash and preventing it from restarting without manual intervention.
Metrics
Affected Vendors & Products
References
History
Wed, 05 Aug 2026 14:30:00 +0000
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| Metrics |
ssvc
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Wed, 05 Aug 2026 12:15:00 +0000
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| References |
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| Metrics |
threat_severity
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threat_severity
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Wed, 05 Aug 2026 10:45:00 +0000
| Type | Values Removed | Values Added |
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| First Time appeared |
Dhcp-server
Dhcp-server dhcp-server |
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| Vendors & Products |
Dhcp-server
Dhcp-server dhcp-server |
Tue, 04 Aug 2026 23:30:00 +0000
| Type | Values Removed | Values Added |
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| Description | A flaw was found in dhcp-server. A remote attacker with network access to the OMAPI (Open Management Application Programming Interface) port, especially if not secured with TSIG (Transaction Signature) key authentication, could send a specially crafted lease creation request. This request, containing an overly long InfiniBand MAC address, triggers a buffer overflow in the `print_hw_addr()` function. Successful exploitation leads to a persistent denial of service (DoS), causing the `dhcpd` service to crash and preventing it from restarting without manual intervention. | |
| Title | Dhcp-server: dhcp-server: persistent denial of service due to buffer overflow via omapi | |
| First Time appeared |
Redhat
Redhat enterprise Linux |
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| Weaknesses | CWE-120 | |
| CPEs | cpe:/o:redhat:enterprise_linux:6 cpe:/o:redhat:enterprise_linux:7 cpe:/o:redhat:enterprise_linux:8 cpe:/o:redhat:enterprise_linux:9 |
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| Vendors & Products |
Redhat
Redhat enterprise Linux |
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| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: redhat
Published: 2026-08-04T23:08:02.438Z
Updated: 2026-08-05T13:58:53.130Z
Reserved: 2026-07-28T17:35:42.520Z
Link: CVE-2026-18103
Updated: 2026-08-05T13:58:49.665Z
No data.