fkie_cve-2021-47517
Vulnerability from fkie_nvd
Published
2024-05-24 15:15
Modified
2025-03-01 02:40
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: ethtool: do not perform operations on net devices being unregistered There is a short period between a net device starts to be unregistered and when it is actually gone. In that time frame ethtool operations could still be performed, which might end up in unwanted or undefined behaviours[1]. Do not allow ethtool operations after a net device starts its unregistration. This patch targets the netlink part as the ioctl one isn't affected: the reference to the net device is taken and the operation is executed within an rtnl lock section and the net device won't be found after unregister. [1] For example adding Tx queues after unregister ends up in NULL pointer exceptions and UaFs, such as: BUG: KASAN: use-after-free in kobject_get+0x14/0x90 Read of size 1 at addr ffff88801961248c by task ethtool/755 CPU: 0 PID: 755 Comm: ethtool Not tainted 5.15.0-rc6+ #778 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-4.fc34 04/014 Call Trace: 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
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7c26da3be1e9843a15b5318f90db8a564479d2acPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cfd719f04267108f5f5bf802b9d7de69e99a99f9Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dde91ccfa25fd58f64c397d91b81a4b393100ffaPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/7c26da3be1e9843a15b5318f90db8a564479d2acPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/cfd719f04267108f5f5bf802b9d7de69e99a99f9Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/dde91ccfa25fd58f64c397d91b81a4b393100ffaPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 5.16
linux linux_kernel 5.16
linux linux_kernel 5.16
linux linux_kernel 5.16


To clipboard 

{
   configurations: [
      {
         nodes: [
            {
               cpeMatch: [
                  {
                     criteria: "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                     matchCriteriaId: "CF5B2E11-44A8-4C67-B99B-14BA2E16E8D9",
                     versionEndExcluding: "5.10.87",
                     versionStartIncluding: "5.6",
                     vulnerable: true,
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                     criteria: "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                     versionEndExcluding: "5.15.8",
                     versionStartIncluding: "5.11",
                     vulnerable: true,
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                     criteria: "cpe:2.3:o:linux:linux_kernel:5.16:rc1:*:*:*:*:*:*",
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                     matchCriteriaId: "A73429BA-C2D9-4D0C-A75F-06A1CA8B3983",
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                     vulnerable: true,
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               negate: false,
               operator: "OR",
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   ],
   cveTags: [],
   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't affected: the reference to the net device is taken and the\noperation is executed within an rtnl lock section and the net device\nwon't 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 están dando de baja. Hay un breve período entre que un dispositivo de red comienza a darse de baja y cuando realmente desaparece. En ese período aún se podrían realizar operaciones de ethtool, lo que podría terminar en comportamientos no deseados o indefinidos[1]. No permita operaciones de ethtool después de que un dispositivo de red inicie su cancelación 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 operación se ejecuta dentro de una sección de bloqueo rtnl y el dispositivo de red no se encontrará después de cancelar el registro. [1] Por ejemplo, agregar colas de Tx después 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 tamaño 1 en la dirección ffff88801961248c mediante la tarea ethtool/755 CPU : 0 PID: 755 Comm: ethtool Not tainted 5.15.0-rc6+ #778 Nombre de hardware: PC estándar 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",
      },
   ],
   id: "CVE-2021-47517",
   lastModified: "2025-03-01T02:40:24.407",
   metrics: {
      cvssMetricV31: [
         {
            cvssData: {
               attackComplexity: "LOW",
               attackVector: "LOCAL",
               availabilityImpact: "HIGH",
               baseScore: 7.8,
               baseSeverity: "HIGH",
               confidentialityImpact: "HIGH",
               integrityImpact: "HIGH",
               privilegesRequired: "LOW",
               scope: "UNCHANGED",
               userInteraction: "NONE",
               vectorString: "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
               version: "3.1",
            },
            exploitabilityScore: 1.8,
            impactScore: 5.9,
            source: "nvd@nist.gov",
            type: "Primary",
         },
      ],
   },
   published: "2024-05-24T15:15:13.347",
   references: [
      {
         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         tags: [
            "Patch",
         ],
         url: "https://git.kernel.org/stable/c/7c26da3be1e9843a15b5318f90db8a564479d2ac",
      },
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         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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         source: "af854a3a-2127-422b-91ae-364da2661108",
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         source: "af854a3a-2127-422b-91ae-364da2661108",
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         url: "https://git.kernel.org/stable/c/dde91ccfa25fd58f64c397d91b81a4b393100ffa",
      },
   ],
   sourceIdentifier: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
   vulnStatus: "Analyzed",
   weaknesses: [
      {
         description: [
            {
               lang: "en",
               value: "CWE-416",
            },
         ],
         source: "nvd@nist.gov",
         type: "Primary",
      },
   ],
}


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