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Solution
No solution given by the vendor.
Workaround
To mitigate this issue, secure OMAPI access by configuring TSIG key authentication to prevent unauthorized connections to the OMAPI port (7911). If the `dhcpd` service has already crashed due to this flaw, manually remove the problematic InfiniBand lease entry from `/var/lib/dhcpd/dhcpd.leases` and then restart the `dhcpd` service. Restarting the `dhcpd` service may temporarily interrupt DHCP services for clients.
Wed, 05 Aug 2026 14:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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 |
|---|---|---|
| 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 |
|
| 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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Projects
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Status: PUBLISHED
Assigner: redhat
Published:
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.
OpenCVE Enrichment
Updated: 2026-08-05T10:18:51Z