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CVE-2025-68194

Estado: AplazadaSin puntuar—

In the Linux kernel, the following vulnerability has been resolved:

media: imon: make send_packet() more robust

syzbot is reporting that imon has three problems which result in hung tasks due to forever holding device lock [1].

First problem is that when usb_rx_callback_intf0() once got -EPROTO error after ictx->dev_present_intf0 became true, usb_rx_callback_intf0() resubmits urb after printk(), and resubmitted urb causes usb_rx_callback_intf0() to again get -EPROTO error. This results in printk() flooding (RCU stalls).

Alan Stern commented [2] that

Since I'm not sure whether it is safe for imon users to give up upon any error code, this patch takes care of only union of error codes chosen from modules in drivers/media/rc/ directory which handle -EPROTO error (i.e. ir_toy, mceusb and igorplugusb).

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Second problem is that when usb_rx_callback_intf0() once got -EPROTO error before ictx->dev_present_intf0 becomes true, usb_rx_callback_intf0() always resubmits urb due to commit 8791d63af0cf ("[media] imon: don't wedge hardware after early callbacks"). Move the ictx->dev_present_intf0 test introduced by commit 6f6b90c9231a ("[media] imon: don't parse scancodes until intf configured") to immediately before imon_incoming_packet(), or the first problem explained above happens without printk() flooding (i.e. hung task).

Third problem is that when usb_rx_callback_intf0() is not called for some reason (e.g. flaky hardware; the reproducer for this problem sometimes prevents usb_rx_callback_intf0() from being called), wait_for_completion_interruptible() in send_packet() never returns (i.e. hung task). As a workaround for such situation, change send_packet() to wait for completion with timeout of 10 seconds.

Detalles técnicos trazas, registros y código del informe original
  In theory it's okay to resubmit _if_ the driver has a robust
  error-recovery scheme (such as giving up after some fixed limit on the
  number of errors or after some fixed time has elapsed, perhaps with a
  time delay to prevent a flood of errors).  Most drivers don't bother to
  do this; they simply give up right away.  This makes them more
  vulnerable to short-term noise interference during USB transfers, but in
  reality such interference is quite rare.  There's nothing really wrong
  with giving up right away.

but imon has a poor error-recovery scheme which just retries forever;
this behavior should be fixed.

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2025-68194",
  "cveTags": [],
  "metrics": {},
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          "vendor": "Linux",
          "product": "Linux",
          "versions": [
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              "version": "21677cfc562a27e099719d413287bc8d1d24deb7",
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          ],
          "programFiles": [
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        }
      ]
    }
  ],
  "published": "2025-12-16T14:15:52.127",
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    }
  ],
  "vulnStatus": "Deferred",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: imon: make send_packet() more robust\n\nsyzbot is reporting that imon has three problems which result in\nhung tasks due to forever holding device lock [1].\n\nFirst problem is that when usb_rx_callback_intf0() once got -EPROTO error\nafter ictx->dev_present_intf0 became true, usb_rx_callback_intf0()\nresubmits urb after printk(), and resubmitted urb causes\nusb_rx_callback_intf0() to again get -EPROTO error. This results in\nprintk() flooding (RCU stalls).\n\nAlan Stern commented [2] that\n\n  In theory it's okay to resubmit _if_ the driver has a robust\n  error-recovery scheme (such as giving up after some fixed limit on the\n  number of errors or after some fixed time has elapsed, perhaps with a\n  time delay to prevent a flood of errors).  Most drivers don't bother to\n  do this; they simply give up right away.  This makes them more\n  vulnerable to short-term noise interference during USB transfers, but in\n  reality such interference is quite rare.  There's nothing really wrong\n  with giving up right away.\n\nbut imon has a poor error-recovery scheme which just retries forever;\nthis behavior should be fixed.\n\nSince I'm not sure whether it is safe for imon users to give up upon any\nerror code, this patch takes care of only union of error codes chosen from\nmodules in drivers/media/rc/ directory which handle -EPROTO error (i.e.\nir_toy, mceusb and igorplugusb).\n\nSecond problem is that when usb_rx_callback_intf0() once got -EPROTO error\nbefore ictx->dev_present_intf0 becomes true, usb_rx_callback_intf0() always\nresubmits urb due to commit 8791d63af0cf (\"[media] imon: don't wedge\nhardware after early callbacks\"). Move the ictx->dev_present_intf0 test\nintroduced by commit 6f6b90c9231a (\"[media] imon: don't parse scancodes\nuntil intf configured\") to immediately before imon_incoming_packet(), or\nthe first problem explained above happens without printk() flooding (i.e.\nhung task).\n\nThird problem is that when usb_rx_callback_intf0() is not called for some\nreason (e.g. flaky hardware; the reproducer for this problem sometimes\nprevents usb_rx_callback_intf0() from being called),\nwait_for_completion_interruptible() in send_packet() never returns (i.e.\nhung task). As a workaround for such situation, change send_packet() to\nwait for completion with timeout of 10 seconds."
    }
  ],
  "lastModified": "2026-06-17T09:58:42.977",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}