Description
To trigger the issue, three configuration parameters must have specific settings: "hostname-char-set" must be left at the default setting, which is "[^A-Za-z0-9.-]"; "hostname-char-replacement" must be empty (the default); and "ddns-qualifying-suffix" must *NOT* be empty (the default is empty). DDNS updates do not need to be enabled for this issue to manifest. A client that sends certain option content would then cause kea-dhcp4 to exit unexpectedly.
This issue affects Kea versions 3.0.1 through 3.0.1 and 3.1.1 through 3.1.2.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| ISC | Kea | 3.0.1 – ≤ 3.0.1, 3.1.1 – ≤ 3.1.2 | 2.6.0 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | kea +4 | 3.0.1-2.el10_1 | RHSA-2025:21038 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | kea-doc | 3.0.1-2.el10_1 | ALSA-2025:21038 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | kea | 3.0.1-2.el10_1 | RLSA-2025:21038 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | kea | 3.0.3-160000.1.1 | SUSE-SU-2026:20989-1 |
| SLES 16.0 | kea | 3.0.3-160000.1.1 | SUSE-SU-2026:20989-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | kea | 3.0.2-1.1 | openSUSE-SU-2025:15677-1 |
| openSUSE Leap 16.0 | kea | 3.0.3-160000.1.1 | openSUSE-SU-2026:20452-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | kea +4 | 3.0.1-2.el10_1 | ELSA-2025-21038 |
Advisories 8
- ALSA-2025:21038 Important: kea security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2025:21038 Red Hat Security Advisory: kea security update Red Hat Security Advisories (RHSA) · Jul 12, 2026
- SUSE-SU-2026:20989-1 Security update for kea SUSE / openSUSE Security Updates · Apr 10, 2026
- WID-SEC-2025-2568 Red Hat Enterprise Linux (kea): Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Apr 9, 2026
- openSUSE-SU-2026:20452-1 Security update for kea SUSE / openSUSE Security Updates · Apr 3, 2026
- openSUSE-SU-2025:15677-1 kea-3.0.2-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- ELSA-2025-21038 Important: kea security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Dec 2, 2025
- RLSA-2025:21038 Important: kea security update Rocky Linux Security Advisories · Nov 21, 2025
References
- CVE-2025-11232 vendor-advisory