fkie_cve-2022-49311
Vulnerability from fkie_nvd
Published
2025-02-26 07:01
Modified
2025-10-01 20:16
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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: drivers: staging: rtl8192bs: Fix deadlock in rtw_joinbss_event_prehandle() There is a deadlock in rtw_joinbss_event_prehandle(), which is shown below: (Thread 1) | (Thread 2) | _set_timer() rtw_joinbss_event_prehandle()| mod_timer() spin_lock_bh() //(1) | (wait a time) ... | _rtw_join_timeout_handler() del_timer_sync() | spin_lock_bh() //(2) (wait timer to stop) | ... We hold pmlmepriv->lock in position (1) of thread 1 and use del_timer_sync() to wait timer to stop, but timer handler also need pmlmepriv->lock in position (2) of thread 2. As a result, rtw_joinbss_event_prehandle() will block forever. This patch extracts del_timer_sync() from the protection of spin_lock_bh(), which could let timer handler to obtain the needed lock. What`s more, we change spin_lock_bh() to spin_lock_irq() in _rtw_join_timeout_handler() in order to prevent deadlock.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/041879b12ddb0c6c83ed9c0bdd10dc82a056f2fcPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1f6c99b94ca3caad346876b3e22e3ca3d25bc8eePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ae60744d5fad840b9d056d35b4b652d95e755846Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/eca9748d9267a38d532464e3305a38629e9c35a9Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *


To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
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              "matchCriteriaId": "30EAD0EB-B3D1-4A88-A3D8-4F8242E81A01",
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrivers: staging: rtl8192bs: Fix deadlock in rtw_joinbss_event_prehandle()\n\nThere is a deadlock in rtw_joinbss_event_prehandle(), which is shown\nbelow:\n\n   (Thread 1)                |      (Thread 2)\n                             | _set_timer()\nrtw_joinbss_event_prehandle()|  mod_timer()\n spin_lock_bh() //(1)        |  (wait a time)\n ...                         | _rtw_join_timeout_handler()\n del_timer_sync()            |  spin_lock_bh() //(2)\n (wait timer to stop)        |  ...\n\nWe hold pmlmepriv-\u003elock in position (1) of thread 1 and\nuse del_timer_sync() to wait timer to stop, but timer handler\nalso need pmlmepriv-\u003elock in position (2) of thread 2.\nAs a result, rtw_joinbss_event_prehandle() will block forever.\n\nThis patch extracts del_timer_sync() from the protection of\nspin_lock_bh(), which could let timer handler to obtain\nthe needed lock. What`s more, we change spin_lock_bh() to\nspin_lock_irq() in _rtw_join_timeout_handler() in order to\nprevent deadlock."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: drivers: staging: rtl8192bs: Corregir bloqueo en rtw_joinbss_event_prehandle() Hay un bloqueo en rtw_joinbss_event_prehandle(), que se muestra a continuaci\u00f3n: (Hilo 1) | (Hilo 2) | _set_timer() rtw_joinbss_event_prehandle()| mod_timer() spin_lock_bh() //(1) | (esperar un tiempo) ... | _rtw_join_timeout_handler() del_timer_sync() | spin_lock_bh() //(2) (esperar a que el temporizador se detenga) | ... Mantenemos pmlmepriv-\u0026gt;lock en la posici\u00f3n (1) del hilo 1 y usamos del_timer_sync() para esperar a que el temporizador se detenga, pero el controlador del temporizador tambi\u00e9n necesita pmlmepriv-\u0026gt;lock en la posici\u00f3n (2) del hilo 2. Como resultado, rtw_joinbss_event_prehandle() se bloquear\u00e1 para siempre. Este parche extrae del_timer_sync() de la protecci\u00f3n de spin_lock_bh(), lo que podr\u00eda permitir que el controlador del temporizador obtenga el bloqueo necesario. Adem\u00e1s, cambiamos spin_lock_bh() por spin_lock_irq() en _rtw_join_timeout_handler() para evitar el bloqueo."
    }
  ],
  "id": "CVE-2022-49311",
  "lastModified": "2025-10-01T20:16:04.783",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
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          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
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  "published": "2025-02-26T07:01:07.887",
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
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          "value": "CWE-667"
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      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    }
  ]
}


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