# CVE-2025-40779: kea: If a DHCPv4 client sends a request with some specific options, and Kea fails to find an appropriate subnet for the cl...

CVE-2025-40779 is fixed in 5 products on 1 platform, first by RHSA-2025:21006, released August 27, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2025-40779
- Priority: High
- CVSS: 7.5 (important)
- EPSS: 0.0054
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 27, 2025

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | kea RHEL 10 | 3.0.1-1.el10_1 | [RHSA-2025:21006](https://patchblox.com/security/data/fix/linux/rhsa-2025-21006.md) | Aug 27, 2025 |
| Linux | kea ol 10 | 0:3.0.1-2.el10_1 | [ELSA-2025-21006](https://patchblox.com/security/data/fix/linux/elsa-2025-21006.md) | Dec 3, 2025 |
| Linux | kea opensuse-leap 16.0 | 3.0.1-160000.1.1 | [OPENSUSE-SU-2026:20341-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20341-1.md) | Mar 11, 2026 |
| Linux | kea-doc ol 10 | 0:3.0.1-2.el10_1 | [ELSA-2025-21006](https://patchblox.com/security/data/fix/linux/elsa-2025-21006.md) | Dec 3, 2025 |
| Linux | kea-hooks ol 10 | 0:3.0.1-2.el10_1 | [ELSA-2025-21006](https://patchblox.com/security/data/fix/linux/elsa-2025-21006.md) | Dec 3, 2025 |
| Linux | kea-keama ol 10 | 0:3.0.1-2.el10_1 | [ELSA-2025-21006](https://patchblox.com/security/data/fix/linux/elsa-2025-21006.md) | Dec 3, 2025 |
| Linux | kea-libs ol 10 | 0:3.0.1-2.el10_1 | [ELSA-2025-21006](https://patchblox.com/security/data/fix/linux/elsa-2025-21006.md) | Dec 3, 2025 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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