CVE-2023-52629
Vulnerability from cvelistv5
Published
2024-03-29 09:13
Modified
2024-12-19 08:22
Severity ?
8.4 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: sh: push-switch: Reorder cleanup operations to avoid use-after-free bug The original code puts flush_work() before timer_shutdown_sync() in switch_drv_remove(). Although we use flush_work() to stop the worker, it could be rescheduled in switch_timer(). As a result, a use-after-free bug can occur. The details are shown below: (cpu 0) | (cpu 1) switch_drv_remove() | flush_work() | ... | switch_timer // timer | schedule_work(&psw->work) timer_shutdown_sync() | ... | switch_work_handler // worker kfree(psw) // free | | psw->state = 0 // use This patch puts timer_shutdown_sync() before flush_work() to mitigate the bugs. As a result, the worker and timer will be stopped safely before the deallocate operations.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/246f80a0b17f8f582b2c0996db02998239057c65
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/610dbd8ac271aa36080aac50b928d700ee3fe4de
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/246f80a0b17f8f582b2c0996db02998239057c65
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/610dbd8ac271aa36080aac50b928d700ee3fe4de
Impacted products
Vendor Product Version
Linux Linux Version: 2.6.20
Show details on NVD website

To clipboard 

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                "options": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsh: push-switch: Reorder cleanup operations to avoid use-after-free bug\n\nThe original code puts flush_work() before timer_shutdown_sync()\nin switch_drv_remove(). Although we use flush_work() to stop\nthe worker, it could be rescheduled in switch_timer(). As a result,\na use-after-free bug can occur. The details are shown below:\n\n      (cpu 0)                    |      (cpu 1)\nswitch_drv_remove()              |\n flush_work()                    |\n  ...                            |  switch_timer // timer\n                                 |   schedule_work(\u0026psw-\u003ework)\n timer_shutdown_sync()           |\n ...                             |  switch_work_handler // worker\n kfree(psw) // free              |\n                                 |   psw-\u003estate = 0 // use\n\nThis patch puts timer_shutdown_sync() before flush_work() to\nmitigate the bugs. As a result, the worker and timer will be\nstopped safely before the deallocate operations."
        }
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    "dateReserved": "2024-03-06T09:52:12.092Z",
    "dateUpdated": "2024-12-19T08:22:56.731Z",
    "state": "PUBLISHED"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2023-52629\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-03-29T10:15:09.327\",\"lastModified\":\"2024-11-21T08:40:14.360\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsh: push-switch: Reorder cleanup operations to avoid use-after-free bug\\n\\nThe original code puts flush_work() before timer_shutdown_sync()\\nin switch_drv_remove(). Although we use flush_work() to stop\\nthe worker, it could be rescheduled in switch_timer(). As a result,\\na use-after-free bug can occur. The details are shown below:\\n\\n      (cpu 0)                    |      (cpu 1)\\nswitch_drv_remove()              |\\n flush_work()                    |\\n  ...                            |  switch_timer // timer\\n                                 |   schedule_work(\u0026psw-\u003ework)\\n timer_shutdown_sync()           |\\n ...                             |  switch_work_handler // worker\\n kfree(psw) // free              |\\n                                 |   psw-\u003estate = 0 // use\\n\\nThis patch puts timer_shutdown_sync() before flush_work() to\\nmitigate the bugs. As a result, the worker and timer will be\\nstopped safely before the deallocate operations.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: sh: push-switch: reordenar las operaciones de limpieza para evitar el error de use after free. El c\u00f3digo original coloca Flush_work() antes de timer_shutdown_sync() en switch_drv_remove(). Aunque usamos Flush_work() para detener al trabajador, podr\u00eda reprogramarse en switch_timer(). Como resultado, puede ocurrir un error de use after free. Los detalles se muestran a continuaci\u00f3n: (cpu 0) | (procesador 1) switch_drv_remove() | descarga_trabajo() | ... | switch_timer // temporizador | Schedule_work(\u0026amp;psw-\u0026gt;trabajo) timer_shutdown_sync() | ... | switch_work_handler // trabajador kfree(psw) // gratis | | psw-\u0026gt;state = 0 // uso Este parche coloca timer_shutdown_sync() antes de Flush_work() para mitigar los errores. Como resultado, el trabajador y el temporizador se detendr\u00e1n de forma segura antes de las operaciones de desasignaci\u00f3n.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":8.4,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.5,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/246f80a0b17f8f582b2c0996db02998239057c65\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/610dbd8ac271aa36080aac50b928d700ee3fe4de\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/246f80a0b17f8f582b2c0996db02998239057c65\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/610dbd8ac271aa36080aac50b928d700ee3fe4de\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}"
  }
}


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