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CVE-2024-44940 (GCVE-0-2024-44940)

Vulnerability from cvelistv5 – Published: 2024-08-26 11:20 – Updated: 2026-08-05 11:37
VLAI
Title
fou: remove warn in gue_gro_receive on unsupported protocol
Summary
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").
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 15:27 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 37dd0247797b168ad1cc7f5dbec825a1ee66535b , < a925a200299a6dfc7c172f54da6f374edc930053 (git)
Affected: 37dd0247797b168ad1cc7f5dbec825a1ee66535b , < b1453a5616c7bd8acd90633ceba4e59105ba3b51 (git)
Affected: 37dd0247797b168ad1cc7f5dbec825a1ee66535b , < 5a2e37bc648a2503bf6d687aed27b9f4455d82eb (git)
Affected: 37dd0247797b168ad1cc7f5dbec825a1ee66535b , < 3db4395332e7050ef9ddeb3052e6b5019f2a2a59 (git)
Affected: 37dd0247797b168ad1cc7f5dbec825a1ee66535b , < 440ab7f97261bc28501636a13998e1b1946d2e79 (git)
Affected: 37dd0247797b168ad1cc7f5dbec825a1ee66535b , < dd89a81d850fa9a65f67b4527c0e420d15bf836c (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.18
Unaffected: 0 , < 3.18 (semver)
Unaffected: 5.10.234 , ≤ 5.10.* (semver)
Unaffected: 5.15.174 , ≤ 5.15.* (semver)
Unaffected: 6.1.107 , ≤ 6.1.* (semver)
Unaffected: 6.6.47 , ≤ 6.6.* (semver)
Unaffected: 6.10.6 , ≤ 6.10.* (semver)
Unaffected: 6.11 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfou: remove warn in gue_gro_receive on unsupported protocol\n\nDrop the WARN_ON_ONCE inn gue_gro_receive if the encapsulated type is\nnot known or does not have a GRO handler.\n\nSuch a packet is easily constructed. Syzbot generates them and sets\noff this warning.\n\nRemove the warning as it is expected and not actionable.\n\nThe warning was previously reduced from WARN_ON to WARN_ON_ONCE in\ncommit 270136613bf7 (\"fou: Do WARN_ON_ONCE in gue_gro_receive for bad\nproto callbacks\")."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: fou: elimine la advertencia en gue_gro_receive en un protocolo no compatible. Descarte WARN_ON_ONCE en gue_gro_receive si el tipo encapsulado no se conoce o no tiene un controlador GRO. Un paquete de este tipo se construye f\u00e1cilmente. Syzbot los genera y activa esta advertencia. Elimine la advertencia como se esperaba y no es procesable. La advertencia se redujo previamente de WARN_ON a WARN_ON_ONCE en el commit 270136613bf7 (\"fou: Haga WARN_ON_ONCE en gue_gro_receive para devoluciones de llamadas de proto incorrectas\")."
          }
        ],
        "id": "CVE-2024-44940",
        "lastModified": "2026-08-04T11:20:01.367",
        "metrics": {
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            "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
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          {
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            "tags": [
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
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                "value": "NVD-CWE-noinfo"
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            "source": "nvd@nist.gov",
            "type": "Primary"
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      "cve": "CVE-2024-44940",
      "id": "CVE-2024-44940",
      "initial_release_date": "2024-08-26T00:00:00+00:00",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: fou: remove warn in gue_gro_receive on unsupported protocol",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-44940.json",
      "version": "3"
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    "suse_vex": {
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      "current_release_date": "2026-09-01T14:00:31Z",
      "cve": "CVE-2024-44940",
      "id": "CVE-2024-44940",
      "initial_release_date": "2024-08-27T02:24:07Z",
      "product_status:known_not_affected": "6",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2024-44940",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-44940.json",
      "version": "23"
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            "title": "CVE Program Container"
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                    "id": "CVE-2024-44940",
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                  "value": "AV:N - The warning is reached from the NAPI GRO receive path (`udp4_gro_receive` \u2192 `gue_gro_receive`) while parsing a UDP datagram arriving from the wire on a host with a FOU/GUE tunnel port, so any remote host that can send a UDP packet to that port triggers it.\nAC:L - The trigger is a single stateless, unsolicited UDP packet whose GUE header carries any `proto_ctype` lacking a registered offload handler; the commit itself notes \"such a packet is easily constructed\" and syzbot generates them, with no race, memory-layout, or timing condition involved.\nPR:N - The GRO path processes the packet before any authentication, authorization, or socket-level filtering \u2014 the FOU receive socket is unconnected, so an unauthenticated off-path attacker needs no credentials on the target.\nUI:N - Processing happens automatically in softirq context when the packet is received; no action by any local user or administrator is required.\nS:U - The warning and any resulting panic occur in the kernel of the receiving host, entirely within the same security authority, with no crossing of a VM, container, or IOMMU boundary.\nC:N - Control flow after the WARN is identical to the fixed code (`goto out`); no memory is read out of bounds and nothing is disclosed to the attacker, who cannot observe the kernel log.\nI:N - The bug involves no memory corruption or state modification \u2014 the packet is dropped from GRO either way, so no attacker-controlled data is written anywhere.\nA:H - The attacker-triggerable WARN_ON_ONCE becomes an immediate kernel panic on systems configured with `panic_on_warn=1` or a `warn_limit`, a common hardening/crash-dump setting in production, cloud, and Android fleets, allowing a single remote packet to take down the host."
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}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.