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Ubuntu 25.10 24.04 LTS Kea DHCP Important Denial of Service USN-8403-1

ubuntu
Calendar Grey June 8, 2026
Dist Ubuntu Esm H88
Kea DHCP has a significant issue where crafted messages can cause crashes, impacting service availability. Update recommended.
Kea DHCP could be made to crash if it received specially crafted messages.

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.

Topics%20covered

Topics Covered

security advisory denial service Ubuntu important software issue isc-kea

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

Severity
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8403-1

Topics%20covered

Topics Covered

security advisory denial service Ubuntu important software issue isc-kea

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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