CVE-2025-38352 (GCVE-0-2025-38352)
Vulnerability from cvelistv5
Published
2025-07-22 08:04
Modified
2025-07-28 04:19
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del() If an exiting non-autoreaping task has already passed exit_notify() and calls handle_posix_cpu_timers() from IRQ, it can be reaped by its parent or debugger right after unlock_task_sighand(). If a concurrent posix_cpu_timer_del() runs at that moment, it won't be able to detect timer->it.cpu.firing != 0: cpu_timer_task_rcu() and/or lock_task_sighand() will fail. Add the tsk->exit_state check into run_posix_cpu_timers() to fix this. This fix is not needed if CONFIG_POSIX_CPU_TIMERS_TASK_WORK=y, because exit_task_work() is called before exit_notify(). But the check still makes sense, task_work_add(&tsk->posix_cputimers_work.work) will fail anyway in this case.
References
Impacted products
Vendor Product Version
Linux Linux Version: 0bdd2ed4138ec04e09b4f8165981efc99e439f55
Version: 0bdd2ed4138ec04e09b4f8165981efc99e439f55
Version: 0bdd2ed4138ec04e09b4f8165981efc99e439f55
Version: 0bdd2ed4138ec04e09b4f8165981efc99e439f55
Version: 0bdd2ed4138ec04e09b4f8165981efc99e439f55
Version: 0bdd2ed4138ec04e09b4f8165981efc99e439f55
Version: 0bdd2ed4138ec04e09b4f8165981efc99e439f55
Version: 0bdd2ed4138ec04e09b4f8165981efc99e439f55
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{
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          "product": "Linux",
          "programFiles": [
            "kernel/time/posix-cpu-timers.c"
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      ],
      "cpeApplicability": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nposix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del()\n\nIf an exiting non-autoreaping task has already passed exit_notify() and\ncalls handle_posix_cpu_timers() from IRQ, it can be reaped by its parent\nor debugger right after unlock_task_sighand().\n\nIf a concurrent posix_cpu_timer_del() runs at that moment, it won\u0027t be\nable to detect timer-\u003eit.cpu.firing != 0: cpu_timer_task_rcu() and/or\nlock_task_sighand() will fail.\n\nAdd the tsk-\u003eexit_state check into run_posix_cpu_timers() to fix this.\n\nThis fix is not needed if CONFIG_POSIX_CPU_TIMERS_TASK_WORK=y, because\nexit_task_work() is called before exit_notify(). But the check still\nmakes sense, task_work_add(\u0026tsk-\u003eposix_cputimers_work.work) will fail\nanyway in this case."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-07-28T04:19:41.105Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/78a4b8e3795b31dae58762bc091bb0f4f74a2200"
        },
        {
          "url": "https://git.kernel.org/stable/c/c076635b3a42771ace7d276de8dc3bc76ee2ba1b"
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        {
          "url": "https://git.kernel.org/stable/c/2f3daa04a9328220de46f0d5c919a6c0073a9f0b"
        },
        {
          "url": "https://git.kernel.org/stable/c/764a7a5dfda23f69919441f2eac2a83e7db6e5bb"
        },
        {
          "url": "https://git.kernel.org/stable/c/2c72fe18cc5f9f1750f5bc148cf1c94c29e106ff"
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          "url": "https://git.kernel.org/stable/c/c29d5318708e67ac13c1b6fc1007d179fb65b4d7"
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          "url": "https://git.kernel.org/stable/c/460188bc042a3f40f72d34b9f7fc6ee66b0b757b"
        },
        {
          "url": "https://git.kernel.org/stable/c/f90fff1e152dedf52b932240ebbd670d83330eca"
        }
      ],
      "title": "posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del()",
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    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38352",
    "datePublished": "2025-07-22T08:04:25.277Z",
    "dateReserved": "2025-04-16T04:51:24.006Z",
    "dateUpdated": "2025-07-28T04:19:41.105Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38352\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-07-22T08:15:23.577\",\"lastModified\":\"2025-07-22T13:05:40.573\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nposix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del()\\n\\nIf an exiting non-autoreaping task has already passed exit_notify() and\\ncalls handle_posix_cpu_timers() from IRQ, it can be reaped by its parent\\nor debugger right after unlock_task_sighand().\\n\\nIf a concurrent posix_cpu_timer_del() runs at that moment, it won\u0027t be\\nable to detect timer-\u003eit.cpu.firing != 0: cpu_timer_task_rcu() and/or\\nlock_task_sighand() will fail.\\n\\nAdd the tsk-\u003eexit_state check into run_posix_cpu_timers() to fix this.\\n\\nThis fix is not needed if CONFIG_POSIX_CPU_TIMERS_TASK_WORK=y, because\\nexit_task_work() is called before exit_notify(). But the check still\\nmakes sense, task_work_add(\u0026tsk-\u003eposix_cputimers_work.work) will fail\\nanyway in this case.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: posix-cpu-timers: corregir la ejecuci\u00f3n entre handle_posix_cpu_timers() y posix_cpu_timer_del(). Si una tarea no autorecuperadora que est\u00e1 saliendo ya ha pasado exit_notify() y llama a handle_posix_cpu_timers() desde IRQ, puede ser recuperada por su padre o depurador justo despu\u00e9s de unlock_task_sighand(). Si en ese momento se ejecuta un posix_cpu_timer_del() concurrente, no podr\u00e1 detectar timer-\u0026gt;it.cpu.firing != 0: cpu_timer_task_rcu() y/o lock_task_sighand() fallar\u00e1n. Agregue la verificaci\u00f3n tsk-\u0026gt;exit_state en run_posix_cpu_timers() para corregir esto. Esta correcci\u00f3n no es necesaria si CONFIG_POSIX_CPU_TIMERS_TASK_WORK=y, porque exit_task_work() se llama antes de exit_notify(). Pero la verificaci\u00f3n sigue teniendo sentido, task_work_add(\u0026amp;tsk-\u0026gt;posix_cputimers_work.work) fallar\u00e1 de todos modos en este caso.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2c72fe18cc5f9f1750f5bc148cf1c94c29e106ff\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2f3daa04a9328220de46f0d5c919a6c0073a9f0b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/460188bc042a3f40f72d34b9f7fc6ee66b0b757b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/764a7a5dfda23f69919441f2eac2a83e7db6e5bb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/78a4b8e3795b31dae58762bc091bb0f4f74a2200\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c076635b3a42771ace7d276de8dc3bc76ee2ba1b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c29d5318708e67ac13c1b6fc1007d179fb65b4d7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f90fff1e152dedf52b932240ebbd670d83330eca\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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