CVE-2023-1206 Denial of service in Kernel

What is CVE-2023-1206?

CVE-2023-1206 is a medium-severity denial of service vulnerability in Fedoraproject Fedora, published on 30 Jun 2023. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A hash collision flaw was found in the IPv6 connection lookup table in the Linux kernel’s IPv6 functionality when a user makes a new kind of SYN flood attack. A user located in the local network or with a high bandwidth connection can increase the CPU usage of the server that accepts IPV6 connections up to 95%.

Weakness: CWE-400

Which versions are affected by CVE-2023-1206?

It affects 3 products.

Products include Fedoraproject Fedora, Linux kernel, Redhat Enterprise Linux.

How do I fix CVE-2023-1206?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2023-1206 being exploited?

There is no known exploitation of CVE-2023-1206 in the wild and no public exploit code.

Public exploit code: 1 proofs of concept on GitHub.

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• CVE-2021-39226 Grafana Authentication Bypass Exploited Critical 9.8
• CVE-2019-5544 VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow Exploited Critical 9.8
• CVE-2024-4947 Google Chromium V8 Type Confusion Exploited Critical 9.6
• CVE-2024-4671 Google Chromium Visuals Use-After-Free Exploited Critical 9.6

All Fedoraproject Fedora vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-27382, DEBIAN-CVE-2023-1206, GHSA-36wf-hpjh-x3fr, UBUNTU-CVE-2023-1206.