{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-44940",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-44940"
  ],
  "published": "2024-08-26T11:21:31Z",
  "summary": "fou: remove warn in gue_gro_receive on unsupported protocol",
  "details": "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\").",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
    }
  ],
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4",
        "1:6.6.20-1+rpt1",
        "1:6.6.28-1+rpt1",
        "1:6.6.31-1+rpt1"
      ],
      "ecosystem_specific": {
        "binaries": [
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            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
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            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
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            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
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            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.6.20+rpt-rpi-2712",
            "binary_version": "1:6.6.20-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.6.20+rpt-rpi-v6",
            "binary_version": "1:6.6.20-1+rpt1"
          },
          {
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            "binary_version": "1:6.6.20-1+rpt1"
          },
          {
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            "binary_version": "1:6.6.20-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.6.20+rpt-rpi-v8",
            "binary_version": "1:6.6.20-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.6.28+rpt-rpi-2712",
            "binary_version": "1:6.6.28-1+rpt1"
          },
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            "binary_version": "1:6.6.28-1+rpt1"
          },
          {
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            "binary_version": "1:6.6.28-1+rpt1"
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            "binary_version": "1:6.6.28-1+rpt1"
          },
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            "binary_version": "1:6.6.28-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.6.31+rpt-rpi-2712",
            "binary_version": "1:6.6.31-1+rpt1"
          },
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            "binary_version": "1:6.6.31-1+rpt1"
          },
          {
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            "binary_version": "1:6.6.31-1+rpt1"
          },
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            "binary_version": "1:6.6.31-1+rpt1"
          },
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            "binary_version": "1:6.6.31-1+rpt1"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.107",
            "compiled_filter": false
          },
          "1:6.6.20-1+rpt1": {
            "linux_commit": "6f16847710cc0502450788b9f12f0a14d3429668",
            "upstream_version": "6.6.20",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.6.47"
          },
          "1:6.6.28-1+rpt1": {
            "linux_commit": "0c341f47adc3578cd5f817aa20ee2b7f9ae6b23e",
            "upstream_version": "6.6.28",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.6.47"
          },
          "1:6.6.31-1+rpt1": {
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            "upstream_version": "6.6.31",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.6.47"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-44940"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a925a200299a6dfc7c172f54da6f374edc930053"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b1453a5616c7bd8acd90633ceba4e59105ba3b51"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5a2e37bc648a2503bf6d687aed27b9f4455d82eb"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3db4395332e7050ef9ddeb3052e6b5019f2a2a59"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/440ab7f97261bc28501636a13998e1b1946d2e79"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/dd89a81d850fa9a65f67b4527c0e420d15bf836c"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T11:52:36Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.5,
      "cvss_v3_severity": "High",
      "scenario": "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."
    }
  }
}