CVE-2024-26698

{
  "id": "CVE-2024-26698",
  "cveTags": [],
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          "id": "CVE-2024-26698",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
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          "version": "2.0.3",
          "timestamp": "2024-04-03T18:03:45.740958Z"
        }
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        "source": "nvd@nist.gov",
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          "version": "3.1",
          "baseScore": 4.7,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1
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  "affected": [
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          "product": "Linux",
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          ],
          "programFiles": [
            "drivers/net/hyperv/netvsc.c"
          ],
          "defaultStatus": "unaffected"
        },
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          "product": "Linux",
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              "version": "0",
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          "programFiles": [
            "drivers/net/hyperv/netvsc.c"
          ],
          "defaultStatus": "affected"
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  "published": "2024-04-03T15:15:52.933",
  "references": [
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    {
      "url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html",
      "tags": [
        "Mailing List"
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  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-362"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhv_netvsc: Fix race condition between netvsc_probe and netvsc_remove\n\nIn commit ac5047671758 (\"hv_netvsc: Disable NAPI before closing the\nVMBus channel\"), napi_disable was getting called for all channels,\nincluding all subchannels without confirming if they are enabled or not.\n\nThis caused hv_netvsc getting hung at napi_disable, when netvsc_probe()\nhas finished running but nvdev->subchan_work has not started yet.\nnetvsc_subchan_work() -> rndis_set_subchannel() has not created the\nsub-channels and because of that netvsc_sc_open() is not running.\nnetvsc_remove() calls cancel_work_sync(&nvdev->subchan_work), for which\nnetvsc_subchan_work did not run.\n\nnetif_napi_add() sets the bit NAPI_STATE_SCHED because it ensures NAPI\ncannot be scheduled. Then netvsc_sc_open() -> napi_enable will clear the\nNAPIF_STATE_SCHED bit, so it can be scheduled. napi_disable() does the\nopposite.\n\nNow during netvsc_device_remove(), when napi_disable is called for those\nsubchannels, napi_disable gets stuck on infinite msleep.\n\nThis fix addresses this problem by ensuring that napi_disable() is not\ngetting called for non-enabled NAPI struct.\nBut netif_napi_del() is still necessary for these non-enabled NAPI struct\nfor cleanup purpose.\n\nCall trace:\n[  654.559417] task:modprobe        state:D stack:    0 pid: 2321 ppid:  1091 flags:0x00004002\n[  654.568030] Call Trace:\n[  654.571221]  <TASK>\n[  654.573790]  __schedule+0x2d6/0x960\n[  654.577733]  schedule+0x69/0xf0\n[  654.581214]  schedule_timeout+0x87/0x140\n[  654.585463]  ? __bpf_trace_tick_stop+0x20/0x20\n[  654.590291]  msleep+0x2d/0x40\n[  654.593625]  napi_disable+0x2b/0x80\n[  654.597437]  netvsc_device_remove+0x8a/0x1f0 [hv_netvsc]\n[  654.603935]  rndis_filter_device_remove+0x194/0x1c0 [hv_netvsc]\n[  654.611101]  ? do_wait_intr+0xb0/0xb0\n[  654.615753]  netvsc_remove+0x7c/0x120 [hv_netvsc]\n[  654.621675]  vmbus_remove+0x27/0x40 [hv_vmbus]"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se resolvió la siguiente vulnerabilidad: hv_netvsc: corrige la condición de ejecución entre netvsc_probe y netvsc_remove En el commit ac5047671758 (\"hv_netvsc: deshabilite NAPI antes de cerrar el canal VMBus\"), se llamaba a napi_disable para todos los canales, incluidos todos los subcanales sin confirmando si están habilitados o no. Esto provocó que hv_netvsc se colgara en napi_disable, cuando netvsc_probe() terminó de ejecutarse pero nvdev-&gt;subchan_work aún no se inició. netvsc_subchan_work() -&gt; rndis_set_subchannel() no ha creado los subcanales y por eso netvsc_sc_open() no se está ejecutando. netvsc_remove() llama a cancel_work_sync(&amp;nvdev-&gt;subchan_work), para lo cual netvsc_subchan_work no se ejecutó. netif_napi_add() establece el bit NAPI_STATE_SCHED porque garantiza que NAPI no se pueda programar. Luego netvsc_sc_open() -&gt; napi_enable borrará el bit NAPIF_STATE_SCHED, para que pueda programarse. napi_disable() hace lo contrario. Ahora, durante netvsc_device_remove(), cuando se llama a napi_disable para esos subcanales, napi_disable se atasca en msleep infinito. Esta solución soluciona este problema garantizando que no se llame a napi_disable() para una estructura NAPI no habilitada. Pero netif_napi_del() sigue siendo necesario para estas estructuras NAPI no habilitadas con fines de limpieza. Rastreo de llamadas: [654.559417] tarea:modprobe estado:D pila: 0 pid: 2321 ppid: 1091 banderas:0x00004002 [654.568030] Rastreo de llamadas: [654.571221]  [654.573790] __schedule+0x2d6/0x960 [ 65 4.577733] horario+0x69 /0xf0 [654.581214] Schedule_timeout+0x87/0x140 [654.585463]? __bpf_trace_tick_stop+0x20/0x20 [ 654.590291] msleep+0x2d/0x40 [ 654.593625] napi_disable+0x2b/0x80 [ 654.597437] netvsc_device_remove+0x8a/0x1f0 [hv_netvsc] [ 6 54.603935] rndis_filter_device_remove+0x194/0x1c0 [hv_netvsc] [654.611101]? do_wait_intr+0xb0/0xb0 [ 654.615753] netvsc_remove+0x7c/0x120 [hv_netvsc] [ 654.621675] vmbus_remove+0x27/0x40 [hv_vmbus]"
    }
  ],
  "lastModified": "2026-06-17T07:18:07.517",
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