CVE-2023-3022

Kernel panic via IPv6 route-result type confusion

Published Jun 19, 2023 · Updated Mar 11, 2025

Type confusion in the Linux kernel IPv6 module before 5.2-rc1 allows local users to crash the kernel through IPv6 policy routing. fib6_rule_lookup stores either rt6_info or fib6_info in arg.result, but fib6_rule_suppress unconditionally treats the value as rt6_info. Triggering the failed lookup requires IPv6, a specific local policy rule, and a matching packet to a local IPv6 address; the bounded result is a kernel panic.

CVSS severity5.5
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Type confusion in the Linux kernel IPv6 module before 5.2-rc1 allows local users to crash the kernel through IPv6 policy routing. fib6_rule_lookup stores either rt6_info or fib6_info in arg.result, but fib6_rule_suppress unconditionally treats the value as rt6_info. Triggering the failed lookup requires IPv6, a specific local policy rule, and a matching packet to a local IPv6 address; the bounded result is a kernel panic.

The record

CVE
CVE-2023-3022
Published
Jun 19, 2023
Updated
Mar 11, 2025
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-843, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 19, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 11, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Fixed in kernel 5.2-rc1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=Fixed in kernel 5.2-rc1

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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.

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No observations available

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

Weakness, pattern, technique

CWE-843Access of Resource Using Incompatible Type ('Type Confusion')
T1499.004Application or System Exploitation

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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