nvd-json-data-feeds/CVE-2021/CVE-2021-473xx/CVE-2021-47333.json

{
  "id": "CVE-2021-47333",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2024-05-21T15:15:20.200",
  "lastModified": "2024-05-21T16:54:26.047",
  "vulnStatus": "Awaiting Analysis",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmisc: alcor_pci: fix null-ptr-deref when there is no PCI bridge\n\nThere is an issue with the ASPM(optional) capability checking function.\nA device might be attached to root complex directly, in this case,\nbus->self(bridge) will be NULL, thus priv->parent_pdev is NULL.\nSince alcor_pci_init_check_aspm(priv->parent_pdev) checks the PCI link's\nASPM capability and populate parent_cap_off, which will be used later by\nalcor_pci_aspm_ctrl() to dynamically turn on/off device, what we can do\nhere is to avoid checking the capability if we are on the root complex.\nThis will make pdev_cap_off 0 and alcor_pci_aspm_ctrl() will simply\nreturn when bring called, effectively disable ASPM for the device.\n\n[    1.246492] BUG: kernel NULL pointer dereference, address: 00000000000000c0\n[    1.248731] RIP: 0010:pci_read_config_byte+0x5/0x40\n[    1.253998] Call Trace:\n[    1.254131]  ? alcor_pci_find_cap_offset.isra.0+0x3a/0x100 [alcor_pci]\n[    1.254476]  alcor_pci_probe+0x169/0x2d5 [alcor_pci]"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: misc: alcor_pci: corrige null-ptr-deref cuando no hay un puente PCI. Hay un problema con la funci\u00f3n de verificaci\u00f3n de capacidad ASPM (opcional). Un dispositivo se puede conectar directamente al complejo root; en este caso, bus->self(bridge) ser\u00e1 NULL, por lo tanto, priv->parent_pdev es NULL. Dado que alcor_pci_init_check_aspm(priv->parent_pdev) verifica la capacidad ASPM del enlace PCI y completa parent_cap_off, que ser\u00e1 utilizado m\u00e1s adelante por alcor_pci_aspm_ctrl() para encender/apagar din\u00e1micamente el dispositivo, lo que podemos hacer aqu\u00ed es evitar verificar la capacidad si estamos encendidos. el complejo ra\u00edz. Esto har\u00e1 que pdev_cap_off sea 0 y alcor_pci_aspm_ctrl() simplemente regrese cuando se llame a Bring, deshabilitando efectivamente ASPM para el dispositivo. [1.246492] BUG: desreferencia del puntero NULL del kernel, direcci\u00f3n: 00000000000000c0 [1.248731] RIP: 0010:pci_read_config_byte+0x5/0x40 [1.253998] Seguimiento de llamadas: [1.254131]? alcor_pci_find_cap_offset.isra.0+0x3a/0x100 [alcor_pci] [ 1.254476] alcor_pci_probe+0x169/0x2d5 [alcor_pci]"
    }
  ],
  "metrics": {},
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/09d154990ca82d14aed2b72796f6c8845e2e605d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/3ce3e45cc333da707d4d6eb433574b990bcc26f5",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/58f69684ba03e5b0e0a3ae844a845280c0f06309",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/717cf5ae52322ddbdf3ac2c584b34c5970b0d174",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/d2639ffdcad463b358b6bef8645ff81715daffcb",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}