CVE-2025-38352 (GCVE-0-2025-38352)
Vulnerability from cvelistv5
Published
2025-07-22 08:04
Modified
2025-11-03 17:37
Severity ?
7.4 (High) - CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
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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CISA Known Exploited Vulnerability
Data from the CISA Known Exploited Vulnerabilities Catalog

Date added: 2025-09-04

Due date: 2025-09-25

Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Used in ransomware: Unknown

Notes: This vulnerability affects a common open-source component, third-party library, or a protocol used by different products. Please check with specific vendors for information on patching status. For more information, please see: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=2c72fe18cc5f9f1750f5bc148cf1c94c29e106ff ; https://source.android.com/docs/security/bulletin/2025-09-01 ; https://nvd.nist.gov/vuln/detail/CVE-2025-38352

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      "dateAdded": "2025-09-04",
      "dueDate": "2025-09-25",
      "knownRansomwareCampaignUse": "Unknown",
      "notes": "This vulnerability affects a common open-source component, third-party library, or a protocol used by different products. Please check with specific vendors for information on patching status. For more information, please see: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=2c72fe18cc5f9f1750f5bc148cf1c94c29e106ff ; https://source.android.com/docs/security/bulletin/2025-09-01 ; https://nvd.nist.gov/vuln/detail/CVE-2025-38352",
      "product": "Kernel",
      "requiredAction": "Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.",
      "shortDescription": "Linux kernel contains a time-of-check time-of-use (TOCTOU) race condition vulnerability that has a high impact on confidentiality, integrity, and availability.",
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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(). 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}