CVE-2023-1206

MEDIUM
5.7
CVSS Score
Published: June 30, 2023 at 12:00 AM UTC
Updated: October 14, 2026 at 09:17 PM UTC
4 products affected across 3 vendorsLinux KernelFedoraEnterprise Linux

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Severity
MEDIUM5.7
Exploit prediction
EPSS 0.6%
SSVC
No known exploit

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%.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 6.5
Affected range stops below 6.5, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
ADJACENT_NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-400

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