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CVE Record

CVE-2024-44940: fou: remove warn in gue_gro_receive on unsupported protocol

In the Linux kernel, the following vulnerability has been resolved: fou: remove warn in gue_gro_receive on unsupported protocol Drop the WARN_ON_ONCE inn gue_gro_receive if the encapsulated type is not known or does not have a GRO handler. Such a packet is easily constructed. Syzbot generates them and sets off this warning. Remove the warning as it is expected and not actionable. The warning was previously reduced from WARN_ON to WARN_ON_ONCE in commit 270136613bf7 ("fou: Do WARN_ON_ONCE in gue_gro_receive for bad proto callbacks").

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysislow

Security readout for executives and security teams

Plain-English summary

This Linux kernel issue is about a warning triggered by malformed or unsupported GUE-over-FOU network packets. The upstream fix removes a kernel warning because the condition is expected and not actionable. The sources do not show data theft, privilege escalation, active exploitation, or a confirmed denial-of-service impact.

Executive priority

Treat as routine kernel maintenance unless your environment relies heavily on FOU/GUE encapsulation or has kernel-warning escalation policies. There is no source-backed evidence of active exploitation or severe business impact in the provided bundle.

Technical view

In the FOU/GUE receive path, gue_gro_receive could hit WARN_ON_ONCE when the encapsulated protocol is unknown or lacks a GRO handler. The kernel change removes that warning. Multiple stable kernel commits and Debian LTS announcements are referenced, but no CVSS, CWE, or KEV exploitation signal is provided.

Likely exposure

Systems running affected Linux kernel versions with FOU/GUE networking paths present may be exposed. Practical exposure depends on kernel version, distribution backports, and whether relevant encapsulated packet processing is reachable in that environment.

Exploitation context

The CVE text says syzbot can generate packets that trigger the warning. The bundle does not cite real-world exploitation, KEV listing, public weaponization, or impact beyond the kernel warning itself.

Researcher notes

The source evidence supports a cleanup-style kernel fix: removing a WARN_ON_ONCE for an expected unsupported protocol case. Impact remains under-specified because no CVSS, CWE, crash, privilege boundary, or exploitability details are included.

Mitigation direction

  • Update Linux kernels through the relevant vendor or distribution channel.
  • For Debian LTS systems, review and apply the cited Debian security updates.
  • Confirm whether your distribution has backported the referenced stable kernel commits.
  • Monitor vendor guidance because the bundle does not name a separate workaround.

Validation and detection

  • Inventory deployed Linux kernel versions against vendor advisories and fixed builds.
  • Check whether affected systems use FOU or GUE encapsulation features.
  • Review kernel logs for warnings referencing gue_gro_receive or unsupported encapsulated protocols.
  • Validate remediation by confirming the patched kernel package or stable commit lineage.
Prepared
Confidence
medium
Sources
10

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2024-44940 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
3Timeline events
2ADP providers
9Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux37dd0247797b168ad1cc7f5dbec825a1ee66535b, 37dd0247797b168ad1cc7f5dbec825a1ee66535b, 37dd0247797b168ad1cc7f5dbec825a1ee66535b, 37dd0247797b168ad1cc7f5dbec825a1ee66535b, 37dd0247797b168ad1cc7f5dbec825a1ee66535b, 37dd0247797b168ad1cc7f5dbec825a1ee66535bunaffected
LinuxLinux3.18, 0, 5.10.234, 5.15.174, 6.1.107, 6.6.47, 6.10.6, 6.11affected
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.