CVE-2024-56647

Denial of service via incorrect ICMP route attachment

Published Dec 27, 2024 · Updated Jun 1, 2026

Denial of service in the Linux kernel allows local users to trigger an ip_rt_bug warning through crafted XFRM ICMP routing. The icmp_route_lookup() path creates an input route during XFRM relookup and attaches a route whose output handler is ip_rt_bug to a destination-unreachable packet. Triggering the path requires low-privileged local access, XFRM, and an ARP link failure; the warning disrupts availability without exposing or modifying data.

CVSS severity5.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the Linux kernel allows local users to trigger an ip_rt_bug warning through crafted XFRM ICMP routing. The icmp_route_lookup() path creates an input route during XFRM relookup and attaches a route whose output handler is ip_rt_bug to a destination-unreachable packet. Triggering the path requires low-privileged local access, XFRM, and an ARP link failure; the warning disrupts availability without exposing or modifying data.

The record

CVE
CVE-2024-56647
Published
Dec 27, 2024
Updated
Jun 1, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 27, 2024CVE publishedPublication date reported by the CVE source.
  2. Jun 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=2.6.25
  2. Affected versionversion=8b7817f3a959ed99d7443afc12f78a7e1fcc2063 <9545011e7b2a8fc0cbd6e387a09f12cd41d7d82f
  3. Affected versionversion=8b7817f3a959ed99d7443afc12f78a7e1fcc2063 <c44daa7e3c73229f7ac74985acb8c7fb909c4e0a
  4. Affected versionversion=8b7817f3a959ed99d7443afc12f78a7e1fcc2063 <d50981aaaefc3b04490fbc8274d37881a2b1b112
  5. Affected versionversion=8b7817f3a959ed99d7443afc12f78a7e1fcc2063 <da54b3039d436227deebbc202cefea63bd318a38

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.25; version=8b7817f3a959ed99d7443afc12f78a7e1fcc2063 <9545011e7b2a8fc0cbd6e387a09f12cd41d7d82f; version=8b7817f3a959ed99d7443afc12f78a7e1fcc2063 <c44daa7e3c73229f7ac74985acb8c7fb909c4e0a; version=8b7817f3a959ed99d7443afc12f78a7e1fcc2063 <d50981aaaefc3b04490fbc8274d37881a2b1b112; version=8b7817f3a959ed99d7443afc12f78a7e1fcc2063 <da54b3039d436227deebbc202cefea63bd318a38

Published CVSS scores

5.5NVDCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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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