# CVE-2023-3966: Openvswsitch: ovs-vswitch fails to recover after malformed geneve metadata packet > Attackers can cause denial of service in Open vSwitch by sending malformed Geneve packets when hardware offloading is enabled. - **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 22 Feb 2024 - **Updated:** 13 Feb 2025 - **Also known as:** AZL-35089, DEBIAN-CVE-2023-3966, GHSA-r9cj-pfgj-jc26, OESA-2024-1207, SUSE-SU-2024:0738-1, SUSE-SU-2024:0738-2, SUSE-SU-2024:0912-1, SUSE-SU-2024:0922-1, SUSE-SU-2024:0937-1, UBUNTU-CVE-2023-3966, openSUSE-SU-2024:13725-1 ## What is CVE-2023-3966? CVE-2023-3966 is a high-severity denial of service vulnerability in Fedoraproject Fedora, published on 22 Feb 2024. An attacker can exploit it over the internet without logging in, with no action from the victim. ### Official description A flaw was found in Open vSwitch where multiple versions are vulnerable to crafted Geneve packets, which may result in a denial of service and invalid memory accesses. Triggering this issue requires that hardware offloading via the netlink path is enabled. Weakness: CWE-248 (Uncaught Exception) ## Which versions are affected by CVE-2023-3966? It affects 2 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `openvswitch` | SUSE:Enterprise Storage 7.1 | All versions | 2.14.2-150300.19.20.1 | | `openvswitch` | SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSS | All versions | 2.13.2-150200.9.34.1 | | `openvswitch` | SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS | All versions | 2.14.2-150300.19.20.1 | | `openvswitch` | SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | All versions | 2.14.2-150400.24.23.1 | | `openvswitch` | SUSE:Linux Enterprise High Performance Computing 15 SP4-LTSS | All versions | 2.14.2-150400.24.23.1 | | `openvswitch3` | SUSE:Linux Enterprise Micro 5.5 | All versions | 3.1.0-150500.3.16.1 | | `openvswitch3` | SUSE:Linux Enterprise Micro 5.5 | All versions | 3.1.0-150500.3.16.1 | | `openvswitch` | SUSE:Linux Enterprise Module for Legacy 15 SP5 | All versions | 2.14.2-150400.24.23.1 | | `openvswitch` | SUSE:Linux Enterprise Module for Package Hub 15 SP5 | All versions | 2.14.2-150400.24.23.1 | | `openvswitch3` | SUSE:Linux Enterprise Module for Server Applications 15 SP5 | All versions | 3.1.0-150500.3.16.1 | | `openvswitch` | SUSE:Linux Enterprise Server 15 SP2-LTSS | All versions | 2.13.2-150200.9.34.1 | | `openvswitch` | SUSE:Linux Enterprise Server 15 SP3-LTSS | All versions | 2.14.2-150300.19.20.1 | | `openvswitch` | SUSE:Linux Enterprise Server 15 SP4-LTSS | All versions | 2.14.2-150400.24.23.1 | | `openvswitch` | SUSE:Linux Enterprise Server for SAP Applications 15 SP2 | All versions | 2.13.2-150200.9.34.1 | | `openvswitch` | SUSE:Linux Enterprise Server for SAP Applications 15 SP3 | All versions | 2.14.2-150300.19.20.1 | | `openvswitch` | SUSE:Linux Enterprise Server for SAP Applications 15 SP4 | All versions | 2.14.2-150400.24.23.1 | | `openvswitch` | SUSE:Manager Proxy 4.3 | All versions | 2.14.2-150400.24.23.1 | | `openvswitch` | SUSE:Manager Server 4.3 | All versions | 2.14.2-150400.24.23.1 | | `openvswitch` | openSUSE:Leap 15.5 | All versions | 2.14.2-150400.24.23.1 | | `openvswitch3` | openSUSE:Leap 15.5 | All versions | 3.1.0-150500.3.16.1 | | `openvswitch` | openSUSE:Tumbleweed | All versions | 3.1.0-19.1 | Products: Fedoraproject Fedora, Openvswitch Openvswitch. ## How do I fix CVE-2023-3966? Apply the vendor's patch. ## Is CVE-2023-3966 being exploited? There is no known exploitation of CVE-2023-3966 in the wild and no public exploit code. ## Other vulnerabilities in Fedoraproject Fedora - [CVE-2024-4577](https://insights.sbomify.com/CVE-2024-4577/): PHP-CGI OS Command Injection (critical 9.8, exploited in the wild) - [CVE-2021-39226](https://insights.sbomify.com/CVE-2021-39226/): Grafana Authentication Bypass (critical 9.8, exploited in the wild) - [CVE-2019-5544](https://insights.sbomify.com/CVE-2019-5544/): VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow (critical 9.8, exploited in the wild) - [CVE-2024-4947](https://insights.sbomify.com/CVE-2024-4947/): Google Chromium V8 Type Confusion (critical 9.6, exploited in the wild) - [CVE-2024-4671](https://insights.sbomify.com/CVE-2024-4671/): Google Chromium Visuals Use-After-Free (critical 9.6, exploited in the wild) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2023-3966 and fix it if it is affected. What it is: CVE-2023-3966 is a high-severity denial of service vulnerability in Fedoraproject Fedora, published on 22 Feb 2024. An attacker can exploit it over the internet without logging in, with no action from the victim. Exploitation: There is no known exploitation of CVE-2023-3966 in the wild and no public exploit code. Affected product: Fedoraproject Fedora. No package-level version data is available, so check the vendor advisory linked from the reference page. Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2023-3966/ (Markdown: https://insights.sbomify.com/CVE-2023-3966/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2023-3966 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-3966 - OSV: https://osv.dev/vulnerability/CVE-2023-3966 --- From sbomify Insights: https://insights.sbomify.com/CVE-2023-3966/ Summaries are generated and may contain mistakes; the official description above is the record.