CVE-2022-50220 (GCVE-0-2022-50220)
Vulnerability from cvelistv5
Published
2025-06-18 11:03
Modified
2025-07-15 15:43
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: usbnet: Fix linkwatch use-after-free on disconnect usbnet uses the work usbnet_deferred_kevent() to perform tasks which may sleep. On disconnect, completion of the work was originally awaited in ->ndo_stop(). But in 2003, that was moved to ->disconnect() by historic commit "[PATCH] USB: usbnet, prevent exotic rtnl deadlock": https://git.kernel.org/tglx/history/c/0f138bbfd83c The change was made because back then, the kernel's workqueue implementation did not allow waiting for a single work. One had to wait for completion of *all* work by calling flush_scheduled_work(), and that could deadlock when waiting for usbnet_deferred_kevent() with rtnl_mutex held in ->ndo_stop(). The commit solved one problem but created another: It causes a use-after-free in USB Ethernet drivers aqc111.c, asix_devices.c, ax88179_178a.c, ch9200.c and smsc75xx.c: * If the drivers receive a link change interrupt immediately before disconnect, they raise EVENT_LINK_RESET in their (non-sleepable) ->status() callback and schedule usbnet_deferred_kevent(). * usbnet_deferred_kevent() invokes the driver's ->link_reset() callback, which calls netif_carrier_{on,off}(). * That in turn schedules the work linkwatch_event(). Because usbnet_deferred_kevent() is awaited after unregister_netdev(), netif_carrier_{on,off}() may operate on an unregistered netdev and linkwatch_event() may run after free_netdev(), causing a use-after-free. In 2010, usbnet was changed to only wait for a single instance of usbnet_deferred_kevent() instead of *all* work by commit 23f333a2bfaf ("drivers/net: don't use flush_scheduled_work()"). Unfortunately the commit neglected to move the wait back to ->ndo_stop(). Rectify that omission at long last.
References
Impacted products
Vendor Product Version
Linux Linux Version: 23f333a2bfafba80339315b724808982a9de57d9
Version: 23f333a2bfafba80339315b724808982a9de57d9
Version: 23f333a2bfafba80339315b724808982a9de57d9
Version: 23f333a2bfafba80339315b724808982a9de57d9
Version: 23f333a2bfafba80339315b724808982a9de57d9
Version: 23f333a2bfafba80339315b724808982a9de57d9
Version: 23f333a2bfafba80339315b724808982a9de57d9
Version: 23f333a2bfafba80339315b724808982a9de57d9
Version: 23f333a2bfafba80339315b724808982a9de57d9
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{
  "containers": {
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          "product": "Linux",
          "programFiles": [
            "drivers/net/usb/usbnet.c"
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              "version": "5.18.18",
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            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.0",
              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusbnet: Fix linkwatch use-after-free on disconnect\n\nusbnet uses the work usbnet_deferred_kevent() to perform tasks which may\nsleep.  On disconnect, completion of the work was originally awaited in\n-\u003endo_stop().  But in 2003, that was moved to -\u003edisconnect() by historic\ncommit \"[PATCH] USB: usbnet, prevent exotic rtnl deadlock\":\n\n  https://git.kernel.org/tglx/history/c/0f138bbfd83c\n\nThe change was made because back then, the kernel\u0027s workqueue\nimplementation did not allow waiting for a single work.  One had to wait\nfor completion of *all* work by calling flush_scheduled_work(), and that\ncould deadlock when waiting for usbnet_deferred_kevent() with rtnl_mutex\nheld in -\u003endo_stop().\n\nThe commit solved one problem but created another:  It causes a\nuse-after-free in USB Ethernet drivers aqc111.c, asix_devices.c,\nax88179_178a.c, ch9200.c and smsc75xx.c:\n\n* If the drivers receive a link change interrupt immediately before\n  disconnect, they raise EVENT_LINK_RESET in their (non-sleepable)\n  -\u003estatus() callback and schedule usbnet_deferred_kevent().\n* usbnet_deferred_kevent() invokes the driver\u0027s -\u003elink_reset() callback,\n  which calls netif_carrier_{on,off}().\n* That in turn schedules the work linkwatch_event().\n\nBecause usbnet_deferred_kevent() is awaited after unregister_netdev(),\nnetif_carrier_{on,off}() may operate on an unregistered netdev and\nlinkwatch_event() may run after free_netdev(), causing a use-after-free.\n\nIn 2010, usbnet was changed to only wait for a single instance of\nusbnet_deferred_kevent() instead of *all* work by commit 23f333a2bfaf\n(\"drivers/net: don\u0027t use flush_scheduled_work()\").\n\nUnfortunately the commit neglected to move the wait back to\n-\u003endo_stop().  Rectify that omission at long last."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-07-15T15:43:48.595Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d2d6b530d89b0a912148018027386aa049f0a309"
        },
        {
          "url": "https://git.kernel.org/stable/c/e2a521a7dcc463c5017b4426ca0804e151faeff7"
        },
        {
          "url": "https://git.kernel.org/stable/c/7f77dcbc030c2faa6d8e8a594985eeb34018409e"
        },
        {
          "url": "https://git.kernel.org/stable/c/8b4588b8b00b299be16a35be67b331d8fdba03f3"
        },
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          "url": "https://git.kernel.org/stable/c/135199a2edd459d2b123144efcd7f9bcd95128e4"
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          "url": "https://git.kernel.org/stable/c/635fd8953e4309b54ca6a81bed1d4a87668694f4"
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        {
          "url": "https://git.kernel.org/stable/c/a69e617e533edddf3fa3123149900f36e0a6dc74"
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      ],
      "title": "usbnet: Fix linkwatch use-after-free on disconnect",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50220",
    "datePublished": "2025-06-18T11:03:55.461Z",
    "dateReserved": "2025-06-18T10:57:27.430Z",
    "dateUpdated": "2025-07-15T15:43:48.595Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50220\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-06-18T11:15:52.973\",\"lastModified\":\"2025-06-18T13:47:40.833\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nusbnet: Fix linkwatch use-after-free on disconnect\\n\\nusbnet uses the work usbnet_deferred_kevent() to perform tasks which may\\nsleep.  On disconnect, completion of the work was originally awaited in\\n-\u003endo_stop().  But in 2003, that was moved to -\u003edisconnect() by historic\\ncommit \\\"[PATCH] USB: usbnet, prevent exotic rtnl deadlock\\\":\\n\\n  https://git.kernel.org/tglx/history/c/0f138bbfd83c\\n\\nThe change was made because back then, the kernel\u0027s workqueue\\nimplementation did not allow waiting for a single work.  One had to wait\\nfor completion of *all* work by calling flush_scheduled_work(), and that\\ncould deadlock when waiting for usbnet_deferred_kevent() with rtnl_mutex\\nheld in -\u003endo_stop().\\n\\nThe commit solved one problem but created another:  It causes a\\nuse-after-free in USB Ethernet drivers aqc111.c, asix_devices.c,\\nax88179_178a.c, ch9200.c and smsc75xx.c:\\n\\n* If the drivers receive a link change interrupt immediately before\\n  disconnect, they raise EVENT_LINK_RESET in their (non-sleepable)\\n  -\u003estatus() callback and schedule usbnet_deferred_kevent().\\n* usbnet_deferred_kevent() invokes the driver\u0027s -\u003elink_reset() callback,\\n  which calls netif_carrier_{on,off}().\\n* That in turn schedules the work linkwatch_event().\\n\\nBecause usbnet_deferred_kevent() is awaited after unregister_netdev(),\\nnetif_carrier_{on,off}() may operate on an unregistered netdev and\\nlinkwatch_event() may run after free_netdev(), causing a use-after-free.\\n\\nIn 2010, usbnet was changed to only wait for a single instance of\\nusbnet_deferred_kevent() instead of *all* work by commit 23f333a2bfaf\\n(\\\"drivers/net: don\u0027t use flush_scheduled_work()\\\").\\n\\nUnfortunately the commit neglected to move the wait back to\\n-\u003endo_stop().  Rectify that omission at long last.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: usbnet: Se corrige el Use-After-Free de linkwatch al desconectar. usbnet usa la funci\u00f3n usbnet_deferred_kevent() para ejecutar tareas que podr\u00edan estar en estado de suspensi\u00f3n. Al desconectar, la finalizaci\u00f3n de la tarea se esperaba originalmente en -\u0026gt;ndo_stop(). Sin embargo, en 2003, esto se traslad\u00f3 a -\u0026gt;disconnect() mediante el commit hist\u00f3rica \\\"[PATCH] USB: usbnet, previene el bloqueo rtnl ex\u00f3tico\\\": https://git.kernel.org/tglx/history/c/0f138bbfd83c. Este cambio se realiz\u00f3 porque, en aquel entonces, la implementaci\u00f3n de la cola de trabajo del kernel no permit\u00eda esperar una sola tarea. Se deb\u00eda esperar la finalizaci\u00f3n de *todas* las tareas llamando a flush_scheduled_work(), lo que pod\u00eda provocar un bloqueo al esperar usbnet_deferred_kevent() con rtnl_mutex en -\u0026gt;ndo_stop(). El commit resolvi\u00f3 un problema pero cre\u00f3 otro: Provoca un uso despu\u00e9s de la liberaci\u00f3n en los controladores Ethernet USB aqc111.c, asix_devices.c, ax88179_178a.c, ch9200.c y smsc75xx.c: * Si los controladores reciben una interrupci\u00f3n de cambio de enlace inmediatamente antes de la desconexi\u00f3n, generan EVENT_LINK_RESET en su devoluci\u00f3n de llamada -\u0026gt;status() (no inactiva) y programan usbnet_deferred_kevent(). * usbnet_deferred_kevent() invoca la devoluci\u00f3n de llamada -\u0026gt;link_reset() del controlador, que llama a netif_carrier_{on,off}(). * Eso a su vez programa el trabajo linkwatch_event(). Dado que usbnet_deferred_kevent() se espera despu\u00e9s de unregister_netdev(), netif_carrier_{on,off}() puede operar en un netdev no registrado y linkwatch_event() puede ejecutarse despu\u00e9s de free_netdev(), lo que provoca un error de uso despu\u00e9s de la liberaci\u00f3n. En 2010, se modific\u00f3 la configuraci\u00f3n de usbnet para que solo esperara una instancia de usbnet_deferred_kevent() en lugar de *todo* el trabajo mediante el commit 23f333a2bfaf (\\\"drivers/net: no usar flush_scheduled_work()\\\"). Lamentablemente, el commit no retras\u00f3 la espera a -\u0026gt;ndo_stop(). Se corrigi\u00f3 esta omisi\u00f3n de una vez.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/135199a2edd459d2b123144efcd7f9bcd95128e4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/635fd8953e4309b54ca6a81bed1d4a87668694f4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7f77dcbc030c2faa6d8e8a594985eeb34018409e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8b4588b8b00b299be16a35be67b331d8fdba03f3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a69e617e533edddf3fa3123149900f36e0a6dc74\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d2d6b530d89b0a912148018027386aa049f0a309\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d49bb8cf9bfaa06aa527eb30f1a52a071da2e32f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/db3b738ae5f726204876f4303c49cfdf4311403f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e2a521a7dcc463c5017b4426ca0804e151faeff7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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