{
  "id": "CVE-2022-49501",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2025-02-26T07:01:26.257",
  "lastModified": "2025-02-27T19:15:45.300",
  "vulnStatus": "Awaiting Analysis",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusbnet: Run unregister_netdev() before unbind() again\n\nCommit 2c9d6c2b871d (\"usbnet: run unbind() before unregister_netdev()\")\nsought to fix a use-after-free on disconnect of USB Ethernet adapters.\n\nIt turns out that a different fix is necessary to address the issue:\nhttps://lore.kernel.org/netdev/18b3541e5372bc9b9fc733d422f4e698c089077c.1650177997.git.lukas@wunner.de/\n\nSo the commit was not necessary.\n\nThe commit made binding and unbinding of USB Ethernet asymmetrical:\nBefore, usbnet_probe() first invoked the ->bind() callback and then\nregister_netdev().  usbnet_disconnect() mirrored that by first invoking\nunregister_netdev() and then ->unbind().\n\nSince the commit, the order in usbnet_disconnect() is reversed and no\nlonger mirrors usbnet_probe().\n\nOne consequence is that a PHY disconnected (and stopped) in ->unbind()\nis afterwards stopped once more by unregister_netdev() as it closes the\nnetdev before unregistering.  That necessitates a contortion in ->stop()\nbecause the PHY may only be stopped if it hasn't already been\ndisconnected.\n\nReverting the commit allows making the call to phy_stop() unconditional\nin ->stop()."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: usbnet: Run unregister_netdev() before unbind() again El commit 2c9d6c2b871d (\"usbnet: run unbind() before unregister_netdev()\") buscaba corregir un use-after-free al desconectar los adaptadores USB Ethernet. Resulta que es necesaria una correcci\u00f3n diferente para abordar el problema: https://lore.kernel.org/netdev/18b3541e5372bc9b9fc733d422f4e698c089077c.1650177997.git.lukas@wunner.de/ Por lo tanto, el commit no era necesario. El commit hizo que la vinculaci\u00f3n y desvinculaci\u00f3n de USB Ethernet fuera asim\u00e9trica: antes, usbnet_probe() primero invocaba la devoluci\u00f3n de llamada ->bind() y luego register_netdev(). usbnet_disconnect() reflej\u00f3 eso al invocar primero unregister_netdev() y luego ->unbind(). Desde el commit, el orden en usbnet_disconnect() se invierte y ya no refleja usbnet_probe(). Una consecuencia es que un PHY desconectado (y detenido) en ->unbind() se detiene luego una vez m\u00e1s por unregister_netdev() ya que cierra el netdev antes de anular el registro. Eso requiere una contorsi\u00f3n en ->stop() porque el PHY solo se puede detener si no se ha desconectado ya. Revertir el commit permite hacer que la llamada a phy_stop() sea incondicional en ->stop()."
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9
      }
    ]
  },
  "weaknesses": [
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/6d5deb242874d924beccf7eb3cef04c1c3b0da79",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/969a1b3ea3cb7d58a16fe12fd1b04bfc0ea40509",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/d1408f6b4dd78fb1b9e26bcf64477984e5f85409",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/fbda837107f9bd4ec658d2aa88c6856dba606f06",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}