Red HatCVE-2026-18103
Red Hat dhcp-server: buffer overflow
Medium4.9CVE-2026-18103 · Published Aug 5, 2026 · updated Aug 6, 2026
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.
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| Red Hat Enterprise Linux 6 Product | all versions | No fix yet |
| Red Hat Enterprise Linux 7 Product | all versions | No fix yet |
| Red Hat Enterprise Linux 8 Product | all versions | No fix yet |
| Red Hat Enterprise Linux 9 Product | all versions | No fix yet |
Details and references
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
- Severity from
- the vendor (its own CVE record or advisory)
- Weakness
- CWE-120
More Red Hat advisories
All Red Hat| Date | Advisory | Severity | Fixed in |
|---|---|---|---|
| Aug 5 | Red Hat Enterprise Linux 10: integer overflow | Low2.2 | No fix yet |
| Aug 5 | Red Hat RPM: buffer overflow | Medium5.5 | No fix yet |
| Aug 5 | Red Hat OpenShift Container Platform 4: authentication bypass | Medium6.5 | No fix yet |
| Aug 5 | Red Hat SAML broker: origin validation error | High7.4 | No fix yet |
| Aug 5 | Red Hat Keycloak: type confusion | High8.8 | No fix yet |
| Aug 5 | Red Hat LDAP storage provider of Keycloak: improper privilege management | Medium5.4 | No fix yet |