========================================================================== Ubuntu Security Notice USN-8403-1 June 08, 2026
isc-kea vulnerability ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 25.10 - Ubuntu 24.04 LTS Summary: Kea DHCP could be made to crash if it received specially crafted messages. Software Description: - isc-kea: Standards-based DHCP server Details: Ali Norouzi discovered that Kea DHCP did not properly handle maliciously crafted messages over configured API sockets and HA listeners. A remote attacker could possibly use this issue to cause Kea DHCP to crash, resulting in a denial of service. Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 25.10 kea-admin 2.6.3-2ubuntu0.1 kea-common 2.6.3-2ubuntu0.1 kea-dhcp-ddns-server 2.6.3-2ubuntu0.1 kea-dhcp4-server 2.6.3-2ubuntu0.1 kea-dhcp6-server 2.6.3-2ubuntu0.1 Ubuntu 24.04 LTS kea-admin 2.4.1-3ubuntu0.2 kea-common 2.4.1-3ubuntu0.2 kea-dhcp-ddns-server 2.4.1-3ubuntu0.2 kea-dhcp4-server 2.4.1-3ubuntu0.2 kea-dhcp6-server 2.4.1-3ubuntu0.2 After a standard system update you may need to restart Kea DHCP server instances to make all the necessary changes. References: https://ubuntu.com/security/notices/USN-8403-1 CVE-2026-3608 Package Information: https://launchpad.net/ubuntu/+source/isc-kea/2.6.3-2ubuntu0.1 https://launchpad.net/ubuntu/+source/isc-kea/2.4.1-3ubuntu0.2
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