fkie_cve-2022-50422
Vulnerability from fkie_nvd
Published
2025-10-01 12:15
Modified
2025-10-02 19:12
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: scsi: libsas: Fix use-after-free bug in smp_execute_task_sg() When executing SMP task failed, the smp_execute_task_sg() calls del_timer() to delete "slow_task->timer". However, if the timer handler sas_task_internal_timedout() is running, the del_timer() in smp_execute_task_sg() will not stop it and a UAF will happen. The process is shown below: (thread 1) | (thread 2) smp_execute_task_sg() | sas_task_internal_timedout() ... | del_timer() | ... | ... sas_free_task(task) | kfree(task->slow_task) //FREE| | task->slow_task->... //USE Fix by calling del_timer_sync() in smp_execute_task_sg(), which makes sure the timer handler have finished before the "task->slow_task" is deallocated.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/117331a2a5227fb4369c2a1f321d3e3e2e2ef8fe
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2e12ce270f0d926085c1209cc90397e307deef97
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/46ba53c30666717cb06c2b3c5d896301cd00d0c0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a9e5176ead6de64f572ad5c87a72825d9d3c82ae
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e45a1516d2933703a4823d9db71e17c3abeba24f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f7a785177611ffc97d645fcbc196e6de6ad2421d
Impacted products
Vendor Product Version


To clipboard 

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: libsas: Fix use-after-free bug in smp_execute_task_sg()\n\nWhen executing SMP task failed, the smp_execute_task_sg() calls del_timer()\nto delete \"slow_task-\u003etimer\". However, if the timer handler\nsas_task_internal_timedout() is running, the del_timer() in\nsmp_execute_task_sg() will not stop it and a UAF will happen. The process\nis shown below:\n\n      (thread 1)               |        (thread 2)\nsmp_execute_task_sg()          | sas_task_internal_timedout()\n ...                           |\n del_timer()                   |\n ...                           |  ...\n sas_free_task(task)           |\n  kfree(task-\u003eslow_task) //FREE|\n                               |  task-\u003eslow_task-\u003e... //USE\n\nFix by calling del_timer_sync() in smp_execute_task_sg(), which makes sure\nthe timer handler have finished before the \"task-\u003eslow_task\" is\ndeallocated."
    }
  ],
  "id": "CVE-2022-50422",
  "lastModified": "2025-10-02T19:12:17.160",
  "metrics": {},
  "published": "2025-10-01T12:15:33.533",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/117331a2a5227fb4369c2a1f321d3e3e2e2ef8fe"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2e12ce270f0d926085c1209cc90397e307deef97"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/46ba53c30666717cb06c2b3c5d896301cd00d0c0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a9e5176ead6de64f572ad5c87a72825d9d3c82ae"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e45a1516d2933703a4823d9db71e17c3abeba24f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f7a785177611ffc97d645fcbc196e6de6ad2421d"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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