FKIE_CVE-2025-40350

Vulnerability from fkie_nvd - Published: 2025-12-16 14:15 - Updated: 2026-10-14 13:10
Severity
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net/mlx5e: RX, Fix generating skb from non-linear xdp_buff for striding RQ XDP programs can change the layout of an xdp_buff through bpf_xdp_adjust_tail() and bpf_xdp_adjust_head(). Therefore, the driver cannot assume the size of the linear data area nor fragments. Fix the bug in mlx5 by generating skb according to xdp_buff after XDP programs run. Currently, when handling multi-buf XDP, the mlx5 driver assumes the layout of an xdp_buff to be unchanged. That is, the linear data area continues to be empty and fragments remain the same. This may cause the driver to generate erroneous skb or triggering a kernel warning. When an XDP program added linear data through bpf_xdp_adjust_head(), the linear data will be ignored as mlx5e_build_linear_skb() builds an skb without linear data and then pull data from fragments to fill the linear data area. When an XDP program has shrunk the non-linear data through bpf_xdp_adjust_tail(), the delta passed to __pskb_pull_tail() may exceed the actual nonlinear data size and trigger the BUG_ON in it. To fix the issue, first record the original number of fragments. If the number of fragments changes after the XDP program runs, rewind the end fragment pointer by the difference and recalculate the truesize. Then, build the skb with the linear data area matching the xdp_buff. Finally, only pull data in if there is non-linear data and fill the linear part up to 256 bytes.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/87bcef158ac1faca1bd7e0104588e8e2956d10be
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8b051d7f530e8a5237da242fbeafef02fec6b813
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cb9edd583e23979ee546981be963ad5f217e8b18
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f2557d7fa38e9475b38588f5c124476091480f53
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/mellanox/mlx5/core/en_rx.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "8b051d7f530e8a5237da242fbeafef02fec6b813",
              "status": "affected",
              "version": "f52ac7028bec22e925c8fece4f21641eb13b4d6f",
              "versionType": "git"
            },
            {
              "lessThan": "cb9edd583e23979ee546981be963ad5f217e8b18",
              "status": "affected",
              "version": "f52ac7028bec22e925c8fece4f21641eb13b4d6f",
              "versionType": "git"
            },
            {
              "lessThan": "f2557d7fa38e9475b38588f5c124476091480f53",
              "status": "affected",
              "version": "f52ac7028bec22e925c8fece4f21641eb13b4d6f",
              "versionType": "git"
            },
            {
              "lessThan": "87bcef158ac1faca1bd7e0104588e8e2956d10be",
              "status": "affected",
              "version": "f52ac7028bec22e925c8fece4f21641eb13b4d6f",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/mellanox/mlx5/core/en_rx.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.4"
            },
            {
              "lessThan": "6.4",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.115",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.56",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5e: RX, Fix generating skb from non-linear xdp_buff for striding RQ\n\nXDP programs can change the layout of an xdp_buff through\nbpf_xdp_adjust_tail() and bpf_xdp_adjust_head(). Therefore, the driver\ncannot assume the size of the linear data area nor fragments. Fix the\nbug in mlx5 by generating skb according to xdp_buff after XDP programs\nrun.\n\nCurrently, when handling multi-buf XDP, the mlx5 driver assumes the\nlayout of an xdp_buff to be unchanged. That is, the linear data area\ncontinues to be empty and fragments remain the same. This may cause\nthe driver to generate erroneous skb or triggering a kernel\nwarning. When an XDP program added linear data through\nbpf_xdp_adjust_head(), the linear data will be ignored as\nmlx5e_build_linear_skb() builds an skb without linear data and then\npull data from fragments to fill the linear data area. When an XDP\nprogram has shrunk the non-linear data through bpf_xdp_adjust_tail(),\nthe delta passed to __pskb_pull_tail() may exceed the actual nonlinear\ndata size and trigger the BUG_ON in it.\n\nTo fix the issue, first record the original number of fragments. If the\nnumber of fragments changes after the XDP program runs, rewind the end\nfragment pointer by the difference and recalculate the truesize. Then,\nbuild the skb with the linear data area matching the xdp_buff. Finally,\nonly pull data in if there is non-linear data and fill the linear part\nup to 256 bytes."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet/mlx5e: RX, Correcci\u00f3n al generar skb a partir de xdp_buff no lineal para RQ con salto\n\nLos programas XDP pueden cambiar la disposici\u00f3n de un xdp_buff mediante bpf_xdp_adjust_tail() y bpf_xdp_adjust_head(). Por lo tanto, el controlador no puede asumir el tama\u00f1o del \u00e1rea de datos lineal ni de los fragmentos. Se corrige el error en mlx5 generando skb de acuerdo con el xdp_buff despu\u00e9s de que se ejecuten los programas XDP.\n\nActualmente, al manejar XDP multi-buffer, el controlador mlx5 asume que la disposici\u00f3n de un xdp_buff no ha cambiado. Es decir, el \u00e1rea de datos lineal sigue estando vac\u00eda y los fragmentos permanecen igual. Esto puede hacer que el controlador genere skb err\u00f3neos o que se active una advertencia del kernel. Cuando un programa XDP a\u00f1adi\u00f3 datos lineales mediante bpf_xdp_adjust_head(), los datos lineales ser\u00e1n ignorados ya que mlx5e_build_linear_skb() construye un skb sin datos lineales y luego extrae datos de los fragmentos para llenar el \u00e1rea de datos lineal. Cuando un programa XDP ha reducido los datos no lineales mediante bpf_xdp_adjust_tail(), el delta pasado a __pskb_pull_tail() puede exceder el tama\u00f1o real de los datos no lineales y activar el BUG_ON en \u00e9l.\n\nPara solucionar el problema, primero se registra el n\u00famero original de fragmentos. Si el n\u00famero de fragmentos cambia despu\u00e9s de que se ejecute el programa XDP, se retrocede el puntero del fragmento final por la diferencia y se recalcula el truesize. Luego, se construye el skb con el \u00e1rea de datos lineal que coincida con el xdp_buff. Finalmente, solo se extraen datos si hay datos no lineales y se rellena la parte lineal hasta 256 bytes."
    }
  ],
  "id": "CVE-2025-40350",
  "lastModified": "2026-10-14T13:10:00.187",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2025-12-16T14:15:46.840",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/87bcef158ac1faca1bd7e0104588e8e2956d10be"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8b051d7f530e8a5237da242fbeafef02fec6b813"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/cb9edd583e23979ee546981be963ad5f217e8b18"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f2557d7fa38e9475b38588f5c124476091480f53"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Deferred"
}



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