#VU77953 Resource exhaustion in Linux kernel - CVE-2023-1206
Published: July 4, 2023 / Updated: January 4, 2026
Vulnerability identifier: #VU77953
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/U:Green
CVE-ID: CVE-2023-1206
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vulnerable software:
Linux kernel
Linux kernel
Software vendor:
Linux Foundation
Linux Foundation
Description
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a hash collision flaw in the IPv6 connection lookup table in the Linux kernel’s IPv6 functionality when an attacker makes a new kind of SYN flood attack. A remote attacker can increase the CPU usage of the server that accepts IPV6 connections up to 95%.
Remediation
Install updates from vendor's website.