CVE-2023-1206

What it is

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%.

At a glance

Exploitability

Can be exploited from the same network segment with a low-privilege account. High risk of service disruption.

Exploit odds

0.6% chance of exploitation in the next 30 days (EPSS).

Fix

No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

1. 2023-06-30 22:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-10-14 21:17 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 0.6% in the next 30 days (EPSS).
• Severity: 5.7 MEDIUM (CVSS).
• Fix: none linked yet, which raises it.

Details

Published

2023-06-30 22:15 UTC

Last modified

2026-10-14 21:17 UTC

Exploit probability

0.6% · EPSS, next 30 days

Weakness

CWE-400 · Uncontrolled resource consumption

Record status

Modified

Affected

• Linux Kernel < 6.5
• Redhat Enterprise Linux 8.0
• Redhat Enterprise Linux 9.0
• Fedoraproject Fedora 38

Attack profile CVSS 3.1 · 5.7

Attack vector

Adjacent network

Complexity

Low

Privileges needed

Low

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2023-1206.md and follow it. Check whether this project is affected by CVE-2023-1206. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

Copy as ticket · More options · Status badge