{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-22035",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-22035"
  ],
  "published": "2025-04-16T14:14:59Z",
  "summary": "tracing: Fix use-after-free in print_graph_function_flags during tracer switching",
  "details": "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'mdelay(10)' after 'mutex_unlock(&trace_types_lock)' in s_start(),\nand executing the following script:\n\n  $ echo function_graph > current_tracer\n  $ cat trace > /dev/null &\n  $ sleep 5  # Ensure the 'cat' reaches the 'mdelay(10)' point\n  $ echo timerlat > 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 'iter->trace->print_line()';\n  * Another through 'event->funcs->trace()', 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 'function_graph' tracer to the\n'timerlat' tracer, s_start only calls graph_trace_close of the\n'function_graph' tracer to free 'iter->private', but does not set\nit to NULL. This provides an opportunity for 'event->funcs->trace()'\nto use an invalid 'iter->private'.\n\nTo fix this issue, set 'iter->private' 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'iter->private = NULL' during each 'cat trace' when using wakeup and\nirqsoff tracers.\n\n [1] https://lore.kernel.org/all/20231112150030.84609-1-ryncsn@gmail.com/",
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-22035"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/42561fe62c3628ea3bc9623f64f047605e98857f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/de7b309139f862a44379ecd96e93c9133c69f813"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/81a85b12132c8ffe98f5ddbdc185481790aeaa1b"
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      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a2cce54c1748216535dda02e185d07a084be837e"
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      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/099ef3385800828b74933a96c117574637c3fb3a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c85efe6e13743cac6ba4ccf144cb91f44c86231a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f14752d66056d0c7bffe5092130409417d3baa70"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/70be951bc01e4a0e10d443f3510bb17426f257fb"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7f81f27b1093e4895e87b74143c59c055c3b1906"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T12:19:11Z"
  }
}