cve-2021-47517
Vulnerability from cvelistv5
Published
2024-05-24 15:09
Modified
2024-11-04 12:07
Severity ?
Summary
ethtool: do not perform operations on net devices being unregistered
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7c26da3be1e9843a15b5318f90db8a564479d2ac
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cfd719f04267108f5f5bf802b9d7de69e99a99f9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dde91ccfa25fd58f64c397d91b81a4b393100ffa
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

To clipboard 

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                "id": "CVE-2021-47517",
                "options": [
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                    "Exploitation": "none"
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                "role": "CISA Coordinator",
                "timestamp": "2024-05-24T19:18:28.551288Z",
                "version": "2.0.3"
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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        "title": "CISA ADP Vulnrichment"
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        "providerMetadata": {
          "dateUpdated": "2024-08-04T05:39:59.610Z",
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        "title": "CVE Program Container"
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    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ethtool/netlink.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "5.6"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nethtool: do not perform operations on net devices being unregistered\n\nThere is a short period between a net device starts to be unregistered\nand when it is actually gone. In that time frame ethtool operations\ncould still be performed, which might end up in unwanted or undefined\nbehaviours[1].\n\nDo not allow ethtool operations after a net device starts its\nunregistration. This patch targets the netlink part as the ioctl one\nisn\u0027t affected: the reference to the net device is taken and the\noperation is executed within an rtnl lock section and the net device\nwon\u0027t be found after unregister.\n\n[1] For example adding Tx queues after unregister ends up in NULL\n    pointer exceptions and UaFs, such as:\n\n      BUG: KASAN: use-after-free in kobject_get+0x14/0x90\n      Read of size 1 at addr ffff88801961248c by task ethtool/755\n\n      CPU: 0 PID: 755 Comm: ethtool Not tainted 5.15.0-rc6+ #778\n      Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-4.fc34 04/014\n      Call Trace:\n       dump_stack_lvl+0x57/0x72\n       print_address_description.constprop.0+0x1f/0x140\n       kasan_report.cold+0x7f/0x11b\n       kobject_get+0x14/0x90\n       kobject_add_internal+0x3d1/0x450\n       kobject_init_and_add+0xba/0xf0\n       netdev_queue_update_kobjects+0xcf/0x200\n       netif_set_real_num_tx_queues+0xb4/0x310\n       veth_set_channels+0x1c3/0x550\n       ethnl_set_channels+0x524/0x610"
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      "title": "ethtool: do not perform operations on net devices being unregistered",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47517",
    "datePublished": "2024-05-24T15:09:30.675Z",
    "dateReserved": "2024-05-24T15:02:54.824Z",
    "dateUpdated": "2024-11-04T12:07:27.596Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47517\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-24T15:15:13.347\",\"lastModified\":\"2024-05-24T18:09:20.027\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nethtool: do not perform operations on net devices being unregistered\\n\\nThere is a short period between a net device starts to be unregistered\\nand when it is actually gone. In that time frame ethtool operations\\ncould still be performed, which might end up in unwanted or undefined\\nbehaviours[1].\\n\\nDo not allow ethtool operations after a net device starts its\\nunregistration. This patch targets the netlink part as the ioctl one\\nisn\u0027t affected: the reference to the net device is taken and the\\noperation is executed within an rtnl lock section and the net device\\nwon\u0027t be found after unregister.\\n\\n[1] For example adding Tx queues after unregister ends up in NULL\\n    pointer exceptions and UaFs, such as:\\n\\n      BUG: KASAN: use-after-free in kobject_get+0x14/0x90\\n      Read of size 1 at addr ffff88801961248c by task ethtool/755\\n\\n      CPU: 0 PID: 755 Comm: ethtool Not tainted 5.15.0-rc6+ #778\\n      Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-4.fc34 04/014\\n      Call Trace:\\n       dump_stack_lvl+0x57/0x72\\n       print_address_description.constprop.0+0x1f/0x140\\n       kasan_report.cold+0x7f/0x11b\\n       kobject_get+0x14/0x90\\n       kobject_add_internal+0x3d1/0x450\\n       kobject_init_and_add+0xba/0xf0\\n       netdev_queue_update_kobjects+0xcf/0x200\\n       netif_set_real_num_tx_queues+0xb4/0x310\\n       veth_set_channels+0x1c3/0x550\\n       ethnl_set_channels+0x524/0x610\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ethtool: no realiza operaciones en dispositivos de red que se est\u00e1n dando de baja. Hay un breve per\u00edodo entre que un dispositivo de red comienza a darse de baja y cuando realmente desaparece. En ese per\u00edodo a\u00fan se podr\u00edan realizar operaciones de ethtool, lo que podr\u00eda terminar en comportamientos no deseados o indefinidos[1]. No permita operaciones de ethtool despu\u00e9s de que un dispositivo de red inicie su cancelaci\u00f3n del registro. Este parche apunta a la parte netlink ya que la parte ioctl no se ve afectada: se toma la referencia al dispositivo de red y la operaci\u00f3n se ejecuta dentro de una secci\u00f3n de bloqueo rtnl y el dispositivo de red no se encontrar\u00e1 despu\u00e9s de cancelar el registro. [1] Por ejemplo, agregar colas de Tx despu\u00e9s de cancelar el registro termina en excepciones de puntero NULL y UaF, como: ERROR: KASAN: use-after-free en kobject_get+0x14/0x90 Lectura de tama\u00f1o 1 en la direcci\u00f3n ffff88801961248c mediante la tarea ethtool/755 CPU : 0 PID: 755 Comm: ethtool Not tainted 5.15.0-rc6+ #778 Nombre de hardware: PC est\u00e1ndar QEMU (i440FX + PIIX, 1996), BIOS 1.14.0-4.fc34 04/014 Seguimiento de llamadas: dump_stack_lvl+0x57/0x72 print_address_description.constprop.0+0x1f/0x140 kasan_report.cold+0x7f/0x11b kobject_get+0x14/0x90 kobject_add_internal+0x3d1/0x450 kobject_init_and_add+0xba/0xf0 netdev_queue_update_kobjects+0xcf/0x200 netif_set_real_num_tx_queues+0xb4/0x310 veth_set_channels+0x1c3/0x550 ethnl_set_channels+0x524/ 0x610\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/7c26da3be1e9843a15b5318f90db8a564479d2ac\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cfd719f04267108f5f5bf802b9d7de69e99a99f9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dde91ccfa25fd58f64c397d91b81a4b393100ffa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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