fkie_cve-2025-22035
Vulnerability from fkie_nvd
Published
2025-04-16 15:15
Modified
2025-04-25 18:43
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: tracing: Fix use-after-free in print_graph_function_flags during tracer switching Kairui reported a UAF issue in print_graph_function_flags() during ftrace stress testing [1]. This issue can be reproduced if puting a 'mdelay(10)' after 'mutex_unlock(&trace_types_lock)' in s_start(), and executing the following script: $ echo function_graph > current_tracer $ cat trace > /dev/null & $ sleep 5 # Ensure the 'cat' reaches the 'mdelay(10)' point $ echo timerlat > current_tracer The root cause lies in the two calls to print_graph_function_flags within print_trace_line during each s_show(): * One through 'iter->trace->print_line()'; * Another through 'event->funcs->trace()', which is hidden in print_trace_fmt() before print_trace_line returns. Tracer switching only updates the former, while the latter continues to use the print_line function of the old tracer, which in the script above is print_graph_function_flags. Moreover, when switching from the 'function_graph' tracer to the 'timerlat' tracer, s_start only calls graph_trace_close of the 'function_graph' tracer to free 'iter->private', but does not set it to NULL. This provides an opportunity for 'event->funcs->trace()' to use an invalid 'iter->private'. To fix this issue, set 'iter->private' to NULL immediately after freeing it in graph_trace_close(), ensuring that an invalid pointer is not passed to other tracers. Additionally, clean up the unnecessary 'iter->private = NULL' during each 'cat trace' when using wakeup and irqsoff tracers. [1] https://lore.kernel.org/all/20231112150030.84609-1-ryncsn@gmail.com/
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/099ef3385800828b74933a96c117574637c3fb3aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/42561fe62c3628ea3bc9623f64f047605e98857fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/70be951bc01e4a0e10d443f3510bb17426f257fbPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7f81f27b1093e4895e87b74143c59c055c3b1906Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/81a85b12132c8ffe98f5ddbdc185481790aeaa1bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a2cce54c1748216535dda02e185d07a084be837ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c85efe6e13743cac6ba4ccf144cb91f44c86231aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/de7b309139f862a44379ecd96e93c9133c69f813Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f14752d66056d0c7bffe5092130409417d3baa70Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *


To clipboard 

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Fix use-after-free in print_graph_function_flags during tracer switching\n\nKairui reported a UAF issue in print_graph_function_flags() during\nftrace stress testing [1]. This issue can be reproduced if puting a\n\u0027mdelay(10)\u0027 after \u0027mutex_unlock(\u0026trace_types_lock)\u0027 in s_start(),\nand executing the following script:\n\n  $ echo function_graph \u003e current_tracer\n  $ cat trace \u003e /dev/null \u0026\n  $ sleep 5  # Ensure the \u0027cat\u0027 reaches the \u0027mdelay(10)\u0027 point\n  $ echo timerlat \u003e current_tracer\n\nThe root cause lies in the two calls to print_graph_function_flags\nwithin print_trace_line during each s_show():\n\n  * One through \u0027iter-\u003etrace-\u003eprint_line()\u0027;\n  * Another through \u0027event-\u003efuncs-\u003etrace()\u0027, which is hidden in\n    print_trace_fmt() before print_trace_line returns.\n\nTracer switching only updates the former, while the latter continues\nto use the print_line function of the old tracer, which in the script\nabove is print_graph_function_flags.\n\nMoreover, when switching from the \u0027function_graph\u0027 tracer to the\n\u0027timerlat\u0027 tracer, s_start only calls graph_trace_close of the\n\u0027function_graph\u0027 tracer to free \u0027iter-\u003eprivate\u0027, but does not set\nit to NULL. This provides an opportunity for \u0027event-\u003efuncs-\u003etrace()\u0027\nto use an invalid \u0027iter-\u003eprivate\u0027.\n\nTo fix this issue, set \u0027iter-\u003eprivate\u0027 to NULL immediately after\nfreeing it in graph_trace_close(), ensuring that an invalid pointer\nis not passed to other tracers. Additionally, clean up the unnecessary\n\u0027iter-\u003eprivate = NULL\u0027 during each \u0027cat trace\u0027 when using wakeup and\nirqsoff tracers.\n\n [1] https://lore.kernel.org/all/20231112150030.84609-1-ryncsn@gmail.com/"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: tracing: Fix use-after-free en print_graph_function_flags durante el cambio de tracer Kairui inform\u00f3 de un problema de UAF en print_graph_function_flags() durante las pruebas de estr\u00e9s de ftrace [1]. Este problema se puede reproducir si se pone un \u0027mdelay(10)\u0027 despu\u00e9s de \u0027mutex_unlock(\u0026amp;trace_types_lock)\u0027 en s_start() y se ejecuta el siguiente script: $ echo function_graph \u0026gt; current_tracer $ cat trace \u0026gt; /dev/null \u0026amp; $ sleep 5 # Asegurarse de que \u0027cat\u0027 alcance el punto \u0027mdelay(10)\u0027 $ echo timerlat \u0026gt; current_tracer La causa ra\u00edz se encuentra en las dos llamadas a print_graph_function_flags dentro de print_trace_line durante cada s_show(): * Una a trav\u00e9s de \u0027iter-\u0026gt;trace-\u0026gt;print_line()\u0027; * Otra funci\u00f3n mediante \u0027event-\u0026gt;funcs-\u0026gt;trace()\u0027, que est\u00e1 oculta en print_trace_fmt() antes del retorno de print_trace_line. Al cambiar de trazador, solo se actualiza el primero, mientras que el segundo contin\u00faa usando la funci\u00f3n print_line del trazador anterior, que en el script anterior es print_graph_function_flags. Adem\u00e1s, al cambiar del trazador \u0027function_graph\u0027 al trazador \u0027timerlat\u0027, s_start solo llama a graph_trace_close del trazador \u0027function_graph\u0027 para liberar \u0027iter-\u0026gt;private\u0027, pero no lo establece en NULL. Esto permite que \u0027event-\u0026gt;funcs-\u0026gt;trace()\u0027 use un \u0027iter-\u0026gt;private\u0027 no v\u00e1lido. Para solucionar este problema, establezca \u0027iter-\u0026gt;private\u0027 en NULL inmediatamente despu\u00e9s de liberarlo en graph_trace_close(), lo que garantiza que no se pase un puntero no v\u00e1lido a otros trazadores. Adem\u00e1s, limpie el \u0027iter-\u0026gt;private = NULL\u0027 innecesario durante cada \u0027cat trace\u0027 al usar los trazadores wakeup e irqsoff. [1] https://lore.kernel.org/all/20231112150030.84609-1-ryncsn@gmail.com/"
    }
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  "id": "CVE-2025-22035",
  "lastModified": "2025-04-25T18:43:50.147",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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  "published": "2025-04-16T15:15:56.110",
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  "vulnStatus": "Analyzed",
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      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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}


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