CVE-2025-68194 (GCVE-0-2025-68194)

Vulnerability from cvelistv5 – Published: 2025-12-16 13:43 – Updated: 2026-05-11 21:48
VLAI
Title
media: imon: make send_packet() more robust
Summary
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 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. 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). 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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 21677cfc562a27e099719d413287bc8d1d24deb7 , < 519737af11c03590819a6eec2ad532cfdb87ea63 (git)
Affected: 21677cfc562a27e099719d413287bc8d1d24deb7 , < f58ab83b7b7133e6baefe03a46846c4f6ce45e2f (git)
Affected: 21677cfc562a27e099719d413287bc8d1d24deb7 , < 26f6a1dd5d81ad61a875a747698da6f27abf389b (git)
Affected: 21677cfc562a27e099719d413287bc8d1d24deb7 , < 667afd4681781f60a644cd0d2ee6c59cb1c36208 (git)
Affected: 21677cfc562a27e099719d413287bc8d1d24deb7 , < 8231e80118463be5598daaf266c1c83650f1948b (git)
Affected: 21677cfc562a27e099719d413287bc8d1d24deb7 , < 0213e4175abbb9dfcbf7c197e3817d527f459ad5 (git)
Affected: 21677cfc562a27e099719d413287bc8d1d24deb7 , < f7f3ecb4934fff782fa9bb1cd16e2290c041b22d (git)
Affected: 21677cfc562a27e099719d413287bc8d1d24deb7 , < eecd203ada43a4693ce6fdd3a58ae10c7819252c (git)
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Linux Linux Affected: 2.6.35
Unaffected: 0 , < 2.6.35 (semver)
Unaffected: 5.4.302 , ≤ 5.4.* (semver)
Unaffected: 5.10.247 , ≤ 5.10.* (semver)
Unaffected: 5.15.197 , ≤ 5.15.* (semver)
Unaffected: 6.1.159 , ≤ 6.1.* (semver)
Unaffected: 6.6.117 , ≤ 6.6.* (semver)
Unaffected: 6.12.58 , ≤ 6.12.* (semver)
Unaffected: 6.17.8 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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          {
            "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-\u003edev_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\u0027s 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\u0027t 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\u0027s 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\u0027m 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-\u003edev_present_intf0 becomes true, usb_rx_callback_intf0() always\nresubmits urb due to commit 8791d63af0cf (\"[media] imon: don\u0027t wedge\nhardware after early callbacks\"). Move the ictx-\u003edev_present_intf0 test\nintroduced by commit 6f6b90c9231a (\"[media] imon: don\u0027t 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."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nmedia: imon: hacer send_packet() m\u00e1s robusto\n\nsyzbot est\u00e1 informando que imon tiene tres problemas que resultan en tareas colgadas debido a mantener el bloqueo del dispositivo indefinidamente [1].\n\nEl primer problema es que cuando usb_rx_callback_intf0() una vez obtuvo un error -EPROTO despu\u00e9s de que ictx -\u003e dev_present_intf0 se volvi\u00f3 verdadero, usb_rx_callback_intf0() reenv\u00eda el urb despu\u00e9s de printk(), y el urb reenviado hace que usb_rx_callback_intf0() vuelva a obtener un error -EPROTO. Esto resulta en inundaci\u00f3n de printk() (bloqueos de RCU).\n\nAlan Stern coment\u00f3 [2] que\n\nEn teor\u00eda, est\u00e1 bien reenviar _si_ el controlador tiene un esquema robusto de recuperaci\u00f3n de errores (como rendirse despu\u00e9s de un l\u00edmite fijo en el n\u00famero de errores o despu\u00e9s de que haya transcurrido un tiempo fijo, quiz\u00e1s con un retardo de tiempo para evitar una inundaci\u00f3n de errores). La mayor\u00eda de los controladores no se molestan en hacer esto; simplemente se rinden de inmediato. Esto los hace m\u00e1s vulnerables a la interferencia de ruido a corto plazo durante las transferencias USB, pero en realidad dicha interferencia es bastante rara. No hay nada realmente malo en rendirse de inmediato.\n\npero imon tiene un esquema deficiente de recuperaci\u00f3n de errores que simplemente reintenta indefinidamente; este comportamiento deber\u00eda ser corregido.\n\nDado que no estoy seguro de si es seguro para los usuarios de imon rendirse ante cualquier c\u00f3digo de error, este parche se encarga solo de la uni\u00f3n de c\u00f3digos de error elegidos de m\u00f3dulos en el directorio drivers/media/rc/ que manejan el error -EPROTO (es decir, ir_toy, mceusb e igorplugusb).\n\nEl segundo problema es que cuando usb_rx_callback_intf0() una vez obtuvo un error -EPROTO antes de que ictx -\u003e dev_present_intf0 se vuelva verdadero, usb_rx_callback_intf0() siempre reenv\u00eda el urb debido al commit 8791d63af0cf (\u0027[media] imon: no atascar el hardware despu\u00e9s de las devoluciones de llamada tempranas\u0027). Mover la prueba ictx -\u003e dev_present_intf0 introducida por el commit 6f6b90c9231a (\u0027[media] imon: no analizar c\u00f3digos de escaneo hasta que la interfaz est\u00e9 configurada\u0027) a inmediatamente antes de imon_incoming_packet(), o el primer problema explicado anteriormente ocurre sin inundaci\u00f3n de printk() (es decir, tarea colgada).\n\nEl tercer problema es que cuando usb_rx_callback_intf0() no es llamado por alguna raz\u00f3n (por ejemplo, hardware inestable; el reproductor de este problema a veces impide que se llame a usb_rx_callback_intf0()), wait_for_completion_interruptible() en send_packet() nunca regresa (es decir, tarea colgada). Como soluci\u00f3n alternativa para tal situaci\u00f3n, cambiar send_packet() para esperar la finalizaci\u00f3n con un tiempo de espera de 10 segundos."
          }
        ],
        "id": "CVE-2025-68194",
        "lastModified": "2026-10-14T13:10:00.187",
        "metrics": {},
        "published": "2025-12-16T14:15:52.127",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/0213e4175abbb9dfcbf7c197e3817d527f459ad5"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/26f6a1dd5d81ad61a875a747698da6f27abf389b"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/519737af11c03590819a6eec2ad532cfdb87ea63"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/667afd4681781f60a644cd0d2ee6c59cb1c36208"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/8231e80118463be5598daaf266c1c83650f1948b"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/eecd203ada43a4693ce6fdd3a58ae10c7819252c"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f58ab83b7b7133e6baefe03a46846c4f6ce45e2f"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f7f3ecb4934fff782fa9bb1cd16e2290c041b22d"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-06-30T10:32:13+00:00",
      "cve": "CVE-2025-68194",
      "id": "CVE-2025-68194",
      "initial_release_date": "2025-12-16T00:00:00+00:00",
      "product_status:known_affected": "90",
      "product_status:known_not_affected": "184",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: imon media driver denial of service via USB error handling",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68194.json",
      "version": "3"
    }
  }
}



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