CVE-2024-44940Network attack vector

Remote host crash via unsupported GUE protocol

Published Aug 26, 2024 · Updated Aug 5, 2026

Denial of service in affected Linux kernel versions allows remote attackers to crash hosts by sending a crafted GUE packet. In gue_gro_receive, an unsupported encapsulated protocol without a GRO handler reaches WARN_ON_ONCE instead of being treated as an expected packet error. A reachable FOU/GUE tunnel port is required, and the host crashes only when warning-to-panic handling such as panic_on_warn is enabled; otherwise the kernel logs one warning and drops the packet.

CVSS severity7.5
High
EPSS probability0.75%
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 affected Linux kernel versions allows remote attackers to crash hosts by sending a crafted GUE packet. In gue_gro_receive, an unsupported encapsulated protocol without a GRO handler reaches WARN_ON_ONCE instead of being treated as an expected packet error. A reachable FOU/GUE tunnel port is required, and the host crashes only when warning-to-panic handling such as panic_on_warn is enabled; otherwise the kernel logs one warning and drops the packet.

The record

CVE
CVE-2024-44940
Published
Aug 26, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 26, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=3.18
  2. Affected versionversion=37dd0247797b168ad1cc7f5dbec825a1ee66535b <3db4395332e7050ef9ddeb3052e6b5019f2a2a59
  3. Affected versionversion=37dd0247797b168ad1cc7f5dbec825a1ee66535b <440ab7f97261bc28501636a13998e1b1946d2e79
  4. Affected versionversion=37dd0247797b168ad1cc7f5dbec825a1ee66535b <5a2e37bc648a2503bf6d687aed27b9f4455d82eb
  5. Affected versionversion=37dd0247797b168ad1cc7f5dbec825a1ee66535b <a925a200299a6dfc7c172f54da6f374edc930053
  6. Affected versionversion=37dd0247797b168ad1cc7f5dbec825a1ee66535b <b1453a5616c7bd8acd90633ceba4e59105ba3b51
  7. Affected versionversion=37dd0247797b168ad1cc7f5dbec825a1ee66535b <dd89a81d850fa9a65f67b4527c0e420d15bf836c

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.18; version=37dd0247797b168ad1cc7f5dbec825a1ee66535b <3db4395332e7050ef9ddeb3052e6b5019f2a2a59; version=37dd0247797b168ad1cc7f5dbec825a1ee66535b <440ab7f97261bc28501636a13998e1b1946d2e79; version=37dd0247797b168ad1cc7f5dbec825a1ee66535b <5a2e37bc648a2503bf6d687aed27b9f4455d82eb; version=37dd0247797b168ad1cc7f5dbec825a1ee66535b <a925a200299a6dfc7c172f54da6f374edc930053; version=37dd0247797b168ad1cc7f5dbec825a1ee66535b <b1453a5616c7bd8acd90633ceba4e59105ba3b51; version=37dd0247797b168ad1cc7f5dbec825a1ee66535b <dd89a81d850fa9a65f67b4527c0e420d15bf836c

Published CVSS scores

7.5kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/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.

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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)
Vectornetwork
Privilegesunauthenticated
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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