fkie_cve-2025-38448
Vulnerability from fkie_nvd
Published
2025-07-25 16:15
Modified
2025-07-29 14:14
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: u_serial: Fix race condition in TTY wakeup A race condition occurs when gs_start_io() calls either gs_start_rx() or gs_start_tx(), as those functions briefly drop the port_lock for usb_ep_queue(). This allows gs_close() and gserial_disconnect() to clear port.tty and port_usb, respectively. Use the null-safe TTY Port helper function to wake up TTY. Example CPU1: CPU2: gserial_connect() // lock gs_close() // await lock gs_start_rx() // unlock usb_ep_queue() gs_close() // lock, reset port.tty and unlock gs_start_rx() // lock tty_wakeup() // NPE
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/18d58a467ccf011078352d91b4d6a0108c7318e8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a5012673d49788f16bb4e375b002d7743eb642d9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/abf3620cba68e0e51e5c21054ce4f925f75b3661
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c529c3730bd09115684644e26bf01ecbd7e2c2c9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c6eb4a05af3d0ba3bc4e8159287722fb9abc6359
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c8c80a3a35c2e3488409de2d5376ef7e662a2bf5
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d43657b59f36e88289a6066f15bc9a80df5014eb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ee8d688e2ba558f3bb8ac225113740be5f335417
Impacted products
Vendor Product Version


To clipboard 

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: u_serial: Fix race condition in TTY wakeup\n\nA race condition occurs when gs_start_io() calls either gs_start_rx() or\ngs_start_tx(), as those functions briefly drop the port_lock for\nusb_ep_queue(). This allows gs_close() and gserial_disconnect() to clear\nport.tty and port_usb, respectively.\n\nUse the null-safe TTY Port helper function to wake up TTY.\n\nExample\n  CPU1:\t\t\t      CPU2:\n  gserial_connect() // lock\n  \t\t\t      gs_close() // await lock\n  gs_start_rx()     // unlock\n  usb_ep_queue()\n  \t\t\t      gs_close() // lock, reset port.tty and unlock\n  gs_start_rx()     // lock\n  tty_wakeup()      // NPE"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: usb: gadget: u_serial: Correcci\u00f3n de la condici\u00f3n de ejecuci\u00f3n en la activaci\u00f3n de TTY. Una condici\u00f3n de ejecuci\u00f3n ocurre cuando gs_start_io() llama a gs_start_rx() o gs_start_tx(), ya que estas funciones desactivan brevemente el port_lock para usb_ep_queue(). Esto permite que gs_close() y gserial_disconnect() borren port.tty y port_usb, respectivamente. Utilice la funci\u00f3n auxiliar de puerto TTY segura para nulos para activar TTY. Ejemplo CPU1: CPU2: gserial_connect() // bloquear gs_close() // esperar bloqueo gs_start_rx() // desbloquear usb_ep_queue() gs_close() // bloquear, restablecer port.tty y desbloquear gs_start_rx() // bloquear tty_wakeup() // NPE"
    }
  ],
  "id": "CVE-2025-38448",
  "lastModified": "2025-07-29T14:14:55.157",
  "metrics": {},
  "published": "2025-07-25T16:15:30.317",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/18d58a467ccf011078352d91b4d6a0108c7318e8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a5012673d49788f16bb4e375b002d7743eb642d9"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/abf3620cba68e0e51e5c21054ce4f925f75b3661"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c529c3730bd09115684644e26bf01ecbd7e2c2c9"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c6eb4a05af3d0ba3bc4e8159287722fb9abc6359"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c8c80a3a35c2e3488409de2d5376ef7e662a2bf5"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d43657b59f36e88289a6066f15bc9a80df5014eb"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ee8d688e2ba558f3bb8ac225113740be5f335417"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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