FKIE_CVE-2024-46791

Vulnerability from fkie_nvd - Published: 2024-09-18 08:15 - Updated: 2025-11-03 23:16
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: can: mcp251x: fix deadlock if an interrupt occurs during mcp251x_open The mcp251x_hw_wake() function is called with the mpc_lock mutex held and disables the interrupt handler so that no interrupts can be processed while waking the device. If an interrupt has already occurred then waiting for the interrupt handler to complete will deadlock because it will be trying to acquire the same mutex. CPU0 CPU1 ---- ---- mcp251x_open() mutex_lock(&priv->mcp_lock) request_threaded_irq() <interrupt> mcp251x_can_ist() mutex_lock(&priv->mcp_lock) mcp251x_hw_wake() disable_irq() <-- deadlock Use disable_irq_nosync() instead because the interrupt handler does everything while holding the mutex so it doesn't matter if it's still running.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3a49b6b1caf5cefc05264d29079d52c99cb188e0Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/513c8fc189b52f7922e36bdca58997482b198f0ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7dd9c26bd6cf679bcfdef01a8659791aa6487a29Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8fecde9c3f9a4b97b68bb97c9f47e5b662586ba7Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e554113a1cd2a9cfc6c7af7bdea2141c5757e188Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f7ab9e14b23a3eac6714bdc4dba244d8aa1ef646Patch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.11
linux linux_kernel 6.11
linux linux_kernel 6.11
linux linux_kernel 6.11
linux linux_kernel 6.11
linux linux_kernel 6.11
To clipboard 

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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: mcp251x: fix deadlock if an interrupt occurs during mcp251x_open\n\nThe mcp251x_hw_wake() function is called with the mpc_lock mutex held and\ndisables the interrupt handler so that no interrupts can be processed while\nwaking the device. If an interrupt has already occurred then waiting for\nthe interrupt handler to complete will deadlock because it will be trying\nto acquire the same mutex.\n\nCPU0                           CPU1\n----                           ----\nmcp251x_open()\n mutex_lock(\u0026priv-\u003emcp_lock)\n  request_threaded_irq()\n                               \u003cinterrupt\u003e\n                               mcp251x_can_ist()\n                                mutex_lock(\u0026priv-\u003emcp_lock)\n  mcp251x_hw_wake()\n   disable_irq() \u003c-- deadlock\n\nUse disable_irq_nosync() instead because the interrupt handler does\neverything while holding the mutex so it doesn\u0027t matter if it\u0027s still\nrunning."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: can: mcp251x: soluciona el bloqueo si se produce una interrupci\u00f3n durante mcp251x_open La funci\u00f3n mcp251x_hw_wake() se llama con el mutex mpc_lock retenido y desactiva el controlador de interrupciones para que no se puedan procesar interrupciones mientras se activa el dispositivo. Si ya se produjo una interrupci\u00f3n, esperar a que se complete el controlador de interrupciones provocar\u00e1 un bloqueo porque intentar\u00e1 adquirir el mismo mutex. CPU0 CPU1 ---- ---- mcp251x_open() mutex_lock(\u0026amp;priv-\u0026gt;mcp_lock) request_threaded_irq()  mcp251x_can_ist() mutex_lock(\u0026amp;priv-\u0026gt;mcp_lock) mcp251x_hw_wake() deshabilitar_irq() \u0026lt;-- bloqueo Utilice deshabilitar_irq_nosync() en su lugar porque el controlador de interrupciones hace todo mientras mantiene el mutex, por lo que no importa si todav\u00eda se est\u00e1 ejecutando."
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  "id": "CVE-2024-46791",
  "lastModified": "2025-11-03T23:16:01.513",
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          "baseScore": 5.5,
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          "confidentialityImpact": "NONE",
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          "scope": "UNCHANGED",
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  "published": "2024-09-18T08:15:06.067",
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  "vulnStatus": "Modified",
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