Description
If a DHCPv4 client sends a request with some specific options, and Kea fails to find an appropriate subnet for the client, the `kea-dhcp4` process will abort with an assertion failure. This happens only if the client request is unicast directly to Kea; broadcast messages do not cause the problem.
This issue affects Kea versions 2.7.1 through 2.7.9, 3.0.0, and 3.1.0.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| ISC | Kea | 2.7.1 – ≤ 2.7.9, 3.0.0, 3.1.0 | 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 | 3.0.1-1.el10_1 | RHSA-2025:21006 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | kea | 3.0.1-1.1 | openSUSE-SU-2025:15499-1 |
| openSUSE Leap 16.0 | kea | 3.0.1-160000.1.1 | openSUSE-SU-2026:20341-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | kea +4 | 3.0.1-2.el10_1 | ELSA-2025-21006 |
Advisories 5
- RHSA-2025:21006 Red Hat Security Advisory: kea security update Red Hat Security Advisories (RHSA) · Jul 12, 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-2026:20341-1 Security update for kea SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2025:15499-1 kea-3.0.1-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- ELSA-2025-21006 Important: kea security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Dec 3, 2025
References
- CVE-2025-40779 vendor-advisory