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CVE-2026-23206 (GCVE-0-2026-23206)

Vulnerability from cvelistv5 – Published: 2026-02-14 16:27 – Updated: 2026-05-11 22:02
VLAI
Title
dpaa2-switch: prevent ZERO_SIZE_PTR dereference when num_ifs is zero
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.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 0b1b71370458860579831e77485883fcf2e8fbbe , < 2fcccca88456b592bd668db13aa1d29ed257ca2b (git)
Affected: 0b1b71370458860579831e77485883fcf2e8fbbe , < 80165ff16051448d6f840585ebe13f2400415df3 (git)
Affected: 0b1b71370458860579831e77485883fcf2e8fbbe , < b97415c4362f739e25ec6f71012277086fabdf6f (git)
Affected: 0b1b71370458860579831e77485883fcf2e8fbbe , < 4acc40db06ffd0fd92683505342b00c8a7394c60 (git)
Affected: 0b1b71370458860579831e77485883fcf2e8fbbe , < 155eb99aff2920153bf21217ae29565fff81e6af (git)
Affected: 0b1b71370458860579831e77485883fcf2e8fbbe , < ed48a84a72fefb20a82dd90a7caa7807e90c6f66 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.13
Unaffected: 0 , < 5.13 (semver)
Unaffected: 5.15.200 , ≤ 5.15.* (semver)
Unaffected: 6.1.163 , ≤ 6.1.* (semver)
Unaffected: 6.6.124 , ≤ 6.6.* (semver)
Unaffected: 6.12.70 , ≤ 6.12.* (semver)
Unaffected: 6.18.10 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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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. 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T11:39:40+00:00",
      "cve": "CVE-2026-23206",
      "id": "CVE-2026-23206",
      "initial_release_date": "2026-02-14T00:00:00+00:00",
      "product_status:known_affected": "76",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: dpaa2-switch: prevent ZERO_SIZE_PTR dereference when num_ifs is zero",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23206.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-15T05:31:21Z",
      "cve": "CVE-2026-23206",
      "id": "CVE-2026-23206",
      "initial_release_date": "2026-02-16T00:24:58Z",
      "product_status:known_affected": "228",
      "product_status:known_not_affected": "110",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-23206",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-23206.json",
      "version": "10"
    }
  }
}



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