CVE-2025-22035 (GCVE-0-2025-22035)

Vulnerability from cvelistv5 – Published: 2025-04-16 14:11 – Updated: 2025-11-03 19:41
VLAI?
Title
tracing: Fix use-after-free in print_graph_function_flags during tracer switching
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/
Severity ?
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 05319d707732c728eb721ac616a50e7978eb499a , < 42561fe62c3628ea3bc9623f64f047605e98857f (git)
Affected: b8205dfed68183dc1470e83863c5ded6d7fa30a9 , < de7b309139f862a44379ecd96e93c9133c69f813 (git)
Affected: ce6e2b14bc094866d9173db6935da2d752f06d8b , < 81a85b12132c8ffe98f5ddbdc185481790aeaa1b (git)
Affected: 2cb0c037c927db4ec928cc927488e52aa359786e , < a2cce54c1748216535dda02e185d07a084be837e (git)
Affected: eecb91b9f98d6427d4af5fdb8f108f52572a39e7 , < 099ef3385800828b74933a96c117574637c3fb3a (git)
Affected: eecb91b9f98d6427d4af5fdb8f108f52572a39e7 , < c85efe6e13743cac6ba4ccf144cb91f44c86231a (git)
Affected: eecb91b9f98d6427d4af5fdb8f108f52572a39e7 , < f14752d66056d0c7bffe5092130409417d3baa70 (git)
Affected: eecb91b9f98d6427d4af5fdb8f108f52572a39e7 , < 70be951bc01e4a0e10d443f3510bb17426f257fb (git)
Affected: eecb91b9f98d6427d4af5fdb8f108f52572a39e7 , < 7f81f27b1093e4895e87b74143c59c055c3b1906 (git)
Affected: d6b35c9a8d51032ed9890431da3ae39fe76c1ae3 (git)
Affected: 5d433eda76b66ab271f5924b26ddfec063eeb454 (git)
Affected: 2242640e9bd94e706acf75c60a2ab1d0e150e0fb (git)
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    Linux Linux Affected: 6.5
Unaffected: 0 , < 6.5 (semver)
Unaffected: 5.4.292 , ≤ 5.4.* (semver)
Unaffected: 5.10.236 , ≤ 5.10.* (semver)
Unaffected: 5.15.180 , ≤ 5.15.* (semver)
Unaffected: 6.1.134 , ≤ 6.1.* (semver)
Unaffected: 6.6.87 , ≤ 6.6.* (semver)
Unaffected: 6.12.23 , ≤ 6.12.* (semver)
Unaffected: 6.13.11 , ≤ 6.13.* (semver)
Unaffected: 6.14.2 , ≤ 6.14.* (semver)
Unaffected: 6.15 , ≤ * (original_commit_for_fix)
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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/"
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    "datePublished": "2025-04-16T14:11:53.958Z",
    "dateReserved": "2024-12-29T08:45:45.809Z",
    "dateUpdated": "2025-11-03T19:41:18.919Z",
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\"lessThan\": \"a2cce54c1748216535dda02e185d07a084be837e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"eecb91b9f98d6427d4af5fdb8f108f52572a39e7\", \"lessThan\": \"099ef3385800828b74933a96c117574637c3fb3a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"eecb91b9f98d6427d4af5fdb8f108f52572a39e7\", \"lessThan\": \"c85efe6e13743cac6ba4ccf144cb91f44c86231a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"eecb91b9f98d6427d4af5fdb8f108f52572a39e7\", \"lessThan\": \"f14752d66056d0c7bffe5092130409417d3baa70\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"eecb91b9f98d6427d4af5fdb8f108f52572a39e7\", \"lessThan\": \"70be951bc01e4a0e10d443f3510bb17426f257fb\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"eecb91b9f98d6427d4af5fdb8f108f52572a39e7\", \"lessThan\": \"7f81f27b1093e4895e87b74143c59c055c3b1906\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d6b35c9a8d51032ed9890431da3ae39fe76c1ae3\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5d433eda76b66ab271f5924b26ddfec063eeb454\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2242640e9bd94e706acf75c60a2ab1d0e150e0fb\", \"versionType\": \"git\"}], \"programFiles\": [\"kernel/trace/trace_functions_graph.c\", \"kernel/trace/trace_irqsoff.c\", \"kernel/trace/trace_sched_wakeup.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.5\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.5\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.4.292\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.236\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.180\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.134\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.87\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.23\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.13.11\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.13.*\"}, {\"status\": \"unaffected\", \"version\": \"6.14.2\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.14.*\"}, {\"status\": \"unaffected\", \"version\": \"6.15\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"kernel/trace/trace_functions_graph.c\", \"kernel/trace/trace_irqsoff.c\", \"kernel/trace/trace_sched_wakeup.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/42561fe62c3628ea3bc9623f64f047605e98857f\"}, {\"url\": \"https://git.kernel.org/stable/c/de7b309139f862a44379ecd96e93c9133c69f813\"}, {\"url\": \"https://git.kernel.org/stable/c/81a85b12132c8ffe98f5ddbdc185481790aeaa1b\"}, {\"url\": \"https://git.kernel.org/stable/c/a2cce54c1748216535dda02e185d07a084be837e\"}, {\"url\": \"https://git.kernel.org/stable/c/099ef3385800828b74933a96c117574637c3fb3a\"}, {\"url\": \"https://git.kernel.org/stable/c/c85efe6e13743cac6ba4ccf144cb91f44c86231a\"}, {\"url\": \"https://git.kernel.org/stable/c/f14752d66056d0c7bffe5092130409417d3baa70\"}, {\"url\": \"https://git.kernel.org/stable/c/70be951bc01e4a0e10d443f3510bb17426f257fb\"}, {\"url\": \"https://git.kernel.org/stable/c/7f81f27b1093e4895e87b74143c59c055c3b1906\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"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/\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.292\", \"versionStartIncluding\": \"5.4.255\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.236\", \"versionStartIncluding\": \"5.10.193\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.180\", \"versionStartIncluding\": \"5.15.129\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.134\", \"versionStartIncluding\": \"6.1.50\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.87\", \"versionStartIncluding\": \"6.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.23\", \"versionStartIncluding\": \"6.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.13.11\", \"versionStartIncluding\": \"6.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.14.2\", \"versionStartIncluding\": \"6.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.15\", \"versionStartIncluding\": \"6.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.14.324\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.19.293\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"6.4.13\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-26T05:17:03.661Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-22035\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-26T05:17:03.661Z\", \"dateReserved\": \"2024-12-29T08:45:45.809Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-04-16T14:11:53.958Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.