nvd-json-data-feeds/CVE-2022/CVE-2022-488xx/CVE-2022-48892.json

{
  "id": "CVE-2022-48892",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2024-08-21T07:15:05.420",
  "lastModified": "2024-08-29T02:35:56.343",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched/core: Fix use-after-free bug in dup_user_cpus_ptr()\n\nSince commit 07ec77a1d4e8 (\"sched: Allow task CPU affinity to be\nrestricted on asymmetric systems\"), the setting and clearing of\nuser_cpus_ptr are done under pi_lock for arm64 architecture. However,\ndup_user_cpus_ptr() accesses user_cpus_ptr without any lock\nprotection. Since sched_setaffinity() can be invoked from another\nprocess, the process being modified may be undergoing fork() at\nthe same time.  When racing with the clearing of user_cpus_ptr in\n__set_cpus_allowed_ptr_locked(), it can lead to user-after-free and\npossibly double-free in arm64 kernel.\n\nCommit 8f9ea86fdf99 (\"sched: Always preserve the user requested\ncpumask\") fixes this problem as user_cpus_ptr, once set, will never\nbe cleared in a task's lifetime. However, this bug was re-introduced\nin commit 851a723e45d1 (\"sched: Always clear user_cpus_ptr in\ndo_set_cpus_allowed()\") which allows the clearing of user_cpus_ptr in\ndo_set_cpus_allowed(). This time, it will affect all arches.\n\nFix this bug by always clearing the user_cpus_ptr of the newly\ncloned/forked task before the copying process starts and check the\nuser_cpus_ptr state of the source task under pi_lock.\n\nNote to stable, this patch won't be applicable to stable releases.\nJust copy the new dup_user_cpus_ptr() function over."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: sched/core: corrige el error de use-after-free en dup_user_cpus_ptr() Desde el commit 07ec77a1d4e8 (\"sched: permitir que la afinidad de la CPU de la tarea se restrinja en sistemas asim\u00e9tricos\"), la configuraci\u00f3n y La limpieza de user_cpus_ptr se realiza en pi_lock para la arquitectura arm64. Sin embargo, dup_user_cpus_ptr() accede a user_cpus_ptr sin ninguna protecci\u00f3n de bloqueo. Dado que sched_setaffinity() puede invocarse desde otro proceso, el proceso que se est\u00e1 modificando puede estar pasando por fork() al mismo tiempo. Cuando se corre con la limpieza de user_cpus_ptr en __set_cpus_allowed_ptr_locked(), puede llevar a una liberaci\u00f3n posterior del usuario y posiblemente a una liberaci\u00f3n doble en el kernel arm64. El commit 8f9ea86fdf99 (\"programaci\u00f3n: conservar siempre la m\u00e1scara de CPU solicitada por el usuario\") soluciona este problema ya que user_cpus_ptr, una vez configurado, nunca se borrar\u00e1 durante la vida de una tarea. Sin embargo, este error se reintrodujo en el commit 851a723e45d1 (\"sched: borrar siempre user_cpus_ptr en do_set_cpus_allowed()\") que permite borrar user_cpus_ptr en do_set_cpus_allowed(). Esta vez afectar\u00e1 a todos los arcos. Corrija este error borrando siempre el user_cpus_ptr de la tarea reci\u00e9n clonada/bifurcada antes de que comience el proceso de copia y verifique el estado de user_cpus_ptr de la tarea fuente en pi_lock. Nota para las versiones estables: este parche no se aplicar\u00e1 a las versiones estables. Simplemente copie la nueva funci\u00f3n dup_user_cpus_ptr()."
    }
  ],
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    "cvssMetricV31": [
      {
        "source": "nvd@nist.gov",
        "type": "Primary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9
      }
    ]
  },
  "weaknesses": [
    {
      "source": "nvd@nist.gov",
      "type": "Primary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-415"
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          "lang": "en",
          "value": "CWE-416"
        }
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    {
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          "operator": "OR",
          "negate": false,
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      "url": "https://git.kernel.org/stable/c/7b5cc7fd1789ea5dbb942c9f8207b076d365badc",
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