Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
CVE-2023-1206
n/a 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…
AV AC PR UI S C I A CVSS EPSS %ile KEV
A L L N U N N H 5.7 .0063 49.2 —
AFFECTED
Product Versions Fixed
Kernel kernel 6.5-rc1 – —
TIMELINE
Mar 6 Reserved by redhat
Jun 30 Published (CNA: redhat)
Oct 14 ENRICHED — CVE-2023-1206 (Kernel). Received CVSS 5.7 and CPE data from NVD.
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%.
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| March 6, 2023 | Reserved | Reserved by redhat |
| June 30, 2023 | Published | Published (CNA: redhat) |
| October 14, 2026 | ENRICHED | ENRICHED — CVE-2023-1206 (Kernel). Received CVSS 5.7 and CPE data from NVD. |
Affected
Affected products and packages — 1 row
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| n/a | Kernel | — | kernel 6.5-rc1 | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2023-1206 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.
