CVE-2023-1206
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.
Published Jun 30, 2023 · updated Oct 14, 2026 · linux linux kernel
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%.
Timeline
Detection, updates, and resolution for this record.
Jun 30, 2023 · NIST NVD
Detected
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%.
Oct 14, 2026 · NIST NVD
Updated
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%.
Affected
- cpe fedoraproject/fedora38
- cpe linux/linux kernelversion unspecified
- cpe redhat/enterprise linux8.0
- cpe redhat/enterprise linux9.0
Sources
- CVE.orgCVE-2023-1206
Official CVE identifier
cve.org - FIRST EPSSCVE-2023-1206
30-day exploitation probability 0.5%
first.org - NIST NVDCVE-2023-1206
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 acc
nvd.nist.gov