CVE-2023-1206

MEDIUM LAB

Linux Kernel < 6.5 - Denial of Service via IPv6 Connection Lookup Table Hash Collision

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2023-1206. PoCs published by SpiralBL0CK.

AI-analyzed exploit summary This repository demonstrates a covert communication channel exploiting CVE-2023-1206 (IPv6 hash collision timing) and CVE-2024-49882 (cross-container data transfer via hugepage leaks). It includes tools for synchronization, data exfiltration, and analysis.

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%.

Exploits (1)

nomisec WORKING POC 13 stars
by SpiralBL0CK · poc
https://github.com/SpiralBL0CK/CVE-2023-1206-CVE-2025-40040-CVE-2024-49882

This repository demonstrates a covert communication channel exploiting CVE-2023-1206 (IPv6 hash collision timing) and CVE-2024-49882 (cross-container data transfer via hugepage leaks). It includes tools for synchronization, data exfiltration, and analysis.

Classification
Working Poc 95%
Attack Type
Info Leak
Complexity
Complex
Reliability
Reliable
Target: Linux Kernel 6.12 (with reintroduced vulnerabilities)
No auth needed
Prerequisites: Vulnerable kernel (6.12 with specific patches) · Hugepages enabled · Docker with IPv6 support
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (6)

Core 6

Scores

CVSS v3 5.7
EPSS 0.0051
EPSS Percentile 39.2%
Attack Vector ADJACENT_NETWORK
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Lab Environment

COMMUNITY SUSPICIOUS
Community Lab
docker pull postgres:15

Details

CWE
CWE-400
Status published
Products (4)
fedoraproject/fedora 38
linux/linux_kernel < 6.5
redhat/enterprise_linux 8.0
redhat/enterprise_linux 9.0
Published Jun 30, 2023
Tracked Since Feb 18, 2026