RHSA-2026:97486LowCVSS 4.9

Red Hat Security Advisory: dhcp security, bug fix, and enhancement update

Published
November 10, 2026
Last Modified
November 10, 2026

🔗 CVE IDs covered (1)

CVE-2026-18103 →

📋 Description

CVE-2026-18103 — dhcp-server: dhcp-server: Persistent denial of service due to buffer overflow via OMAPI

🎯 Affected products35

  • Red Hat Enterprise Linux BaseOS (v. 9)
  • dhcp-12:4.4.2-22.b1.el9.src as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • dhcp-client-12:4.4.2-22.b1.el9.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • dhcp-client-12:4.4.2-22.b1.el9.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • dhcp-client-12:4.4.2-22.b1.el9.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • dhcp-client-12:4.4.2-22.b1.el9.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • dhcp-client-debuginfo-12:4.4.2-22.b1.el9.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • dhcp-client-debuginfo-12:4.4.2-22.b1.el9.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • dhcp-client-debuginfo-12:4.4.2-22.b1.el9.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • dhcp-client-debuginfo-12:4.4.2-22.b1.el9.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • dhcp-common-12:4.4.2-22.b1.el9.noarch as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • dhcp-debuginfo-12:4.4.2-22.b1.el9.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • dhcp-debuginfo-12:4.4.2-22.b1.el9.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • dhcp-debuginfo-12:4.4.2-22.b1.el9.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • dhcp-debuginfo-12:4.4.2-22.b1.el9.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • dhcp-debugsource-12:4.4.2-22.b1.el9.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • dhcp-debugsource-12:4.4.2-22.b1.el9.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • dhcp-debugsource-12:4.4.2-22.b1.el9.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • dhcp-debugsource-12:4.4.2-22.b1.el9.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • dhcp-relay-12:4.4.2-22.b1.el9.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • dhcp-relay-12:4.4.2-22.b1.el9.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • dhcp-relay-12:4.4.2-22.b1.el9.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • dhcp-relay-12:4.4.2-22.b1.el9.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • dhcp-relay-debuginfo-12:4.4.2-22.b1.el9.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • dhcp-relay-debuginfo-12:4.4.2-22.b1.el9.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • dhcp-relay-debuginfo-12:4.4.2-22.b1.el9.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • dhcp-relay-debuginfo-12:4.4.2-22.b1.el9.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • dhcp-server-12:4.4.2-22.b1.el9.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • dhcp-server-12:4.4.2-22.b1.el9.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • dhcp-server-12:4.4.2-22.b1.el9.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • +5 more not shown

✅ Remediation

For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 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.

🔗 References (5)