FKIE_CVE-2026-23206

Vulnerability from fkie_nvd - Published: 2026-02-14 17:15 - Updated: 2026-03-19 16:34
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: dpaa2-switch: prevent ZERO_SIZE_PTR dereference when num_ifs is zero The driver allocates arrays for ports, FDBs, and filter blocks using kcalloc() with ethsw->sw_attr.num_ifs as the element count. When the device reports zero interfaces (either due to hardware configuration or firmware issues), kcalloc(0, ...) returns ZERO_SIZE_PTR (0x10) instead of NULL. Later in dpaa2_switch_probe(), the NAPI initialization unconditionally accesses ethsw->ports[0]->netdev, which attempts to dereference ZERO_SIZE_PTR (address 0x10), resulting in a kernel panic. Add a check to ensure num_ifs is greater than zero after retrieving device attributes. This prevents the zero-sized allocations and subsequent invalid pointer dereference.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/155eb99aff2920153bf21217ae29565fff81e6afPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2fcccca88456b592bd668db13aa1d29ed257ca2bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4acc40db06ffd0fd92683505342b00c8a7394c60Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/80165ff16051448d6f840585ebe13f2400415df3Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b97415c4362f739e25ec6f71012277086fabdf6fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ed48a84a72fefb20a82dd90a7caa7807e90c6f66Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndpaa2-switch: prevent ZERO_SIZE_PTR dereference when num_ifs is zero\n\nThe driver allocates arrays for ports, FDBs, and filter blocks using\nkcalloc() with ethsw-\u003esw_attr.num_ifs as the element count. When the\ndevice reports zero interfaces (either due to hardware configuration\nor firmware issues), kcalloc(0, ...) returns ZERO_SIZE_PTR (0x10)\ninstead of NULL.\n\nLater in dpaa2_switch_probe(), the NAPI initialization unconditionally\naccesses ethsw-\u003eports[0]-\u003enetdev, which attempts to dereference\nZERO_SIZE_PTR (address 0x10), resulting in a kernel panic.\n\nAdd a check to ensure num_ifs is greater than zero after retrieving\ndevice attributes. This prevents the zero-sized allocations and\nsubsequent invalid pointer dereference."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ndpaa2-switch: evitar la desreferencia de ZERO_SIZE_PTR cuando num_ifs es cero\n\nEl controlador asigna arreglos para puertos, FDBs y bloques de filtro usando kcalloc() con ethsw-\u0026gt;sw_attr.num_ifs como el recuento de elementos. Cuando el dispositivo reporta cero interfaces (ya sea debido a la configuraci\u00f3n del hardware o a problemas de firmware), kcalloc(0, ...) devuelve ZERO_SIZE_PTR (0x10) en lugar de NULL.\n\nM\u00e1s tarde en dpaa2_switch_probe(), la inicializaci\u00f3n de NAPI accede incondicionalmente a ethsw-\u0026gt;ports[0]-\u0026gt;netdev, lo que intenta desreferenciar ZERO_SIZE_PTR (direcci\u00f3n 0x10), resultando en un p\u00e1nico del kernel.\n\nA\u00f1adir una verificaci\u00f3n para asegurar que num_ifs sea mayor que cero despu\u00e9s de recuperar los atributos del dispositivo. Esto evita las asignaciones de tama\u00f1o cero y la subsiguiente desreferencia de puntero inv\u00e1lido."
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  "id": "CVE-2026-23206",
  "lastModified": "2026-03-19T16:34:27.203",
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          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
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        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
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  "published": "2026-02-14T17:15:58.507",
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  "vulnStatus": "Analyzed",
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