CVE-2023-6200

Adjacent-network kernel code execution via IPv6 race

Published Jan 28, 2024 · Updated Jun 5, 2025

Use-after-free in Linux Kernel 6.6.0 through 6.6.8 allows remote attackers to execute kernel code via ICMPv6 router advertisements. Concurrent advertisements can let fib6_clean_expires unlink and free a fib6_info object before fib6_set_expires reuses its gc_link. Exploitation requires an adjacent network, accepted IPv6 router advertisements, and a successful race; success executes code in kernel context.

CVSS severity7.5
High
EPSS probability2.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux Kernel 6.6.0 through 6.6.8 allows remote attackers to execute kernel code via ICMPv6 router advertisements. Concurrent advertisements can let fib6_clean_expires unlink and free a fib6_info object before fib6_set_expires reuses its gc_link. Exploitation requires an adjacent network, accepted IPv6 router advertisements, and a successful race; success executes code in kernel context.

The record

CVE
CVE-2023-6200
Published
Jan 28, 2024
Updated
Jun 5, 2025
Vendor
Fedora Project
Product
Fedora Linux
Classifications
CWE-362, T1210
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 28, 2024CVE publishedPublication date reported by the CVE source.
  2. Jun 5, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Fedora Project · Fedora LinuxAffected versions are unavailable in this record.
The Linux Kernel Organization · Linux KernelAffected versions are unavailable in this record.

Published CVSS scores

7.5NVDCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5Red HatCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1210Exploitation of Remote Services

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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