CVE-2025-39683 (GCVE-0-2025-39683)

Vulnerability from cvelistv5 – Published: 2025-09-05 17:20 – Updated: 2026-05-12 12:06
VLAI?
Title
tracing: Limit access to parser->buffer when trace_get_user failed
Summary
In the Linux kernel, the following vulnerability has been resolved: tracing: Limit access to parser->buffer when trace_get_user failed When the length of the string written to set_ftrace_filter exceeds FTRACE_BUFF_MAX, the following KASAN alarm will be triggered: BUG: KASAN: slab-out-of-bounds in strsep+0x18c/0x1b0 Read of size 1 at addr ffff0000d00bd5ba by task ash/165 CPU: 1 UID: 0 PID: 165 Comm: ash Not tainted 6.16.0-g6bcdbd62bd56-dirty Hardware name: linux,dummy-virt (DT) Call trace: show_stack+0x34/0x50 (C) dump_stack_lvl+0xa0/0x158 print_address_description.constprop.0+0x88/0x398 print_report+0xb0/0x280 kasan_report+0xa4/0xf0 __asan_report_load1_noabort+0x20/0x30 strsep+0x18c/0x1b0 ftrace_process_regex.isra.0+0x100/0x2d8 ftrace_regex_release+0x484/0x618 __fput+0x364/0xa58 ____fput+0x28/0x40 task_work_run+0x154/0x278 do_notify_resume+0x1f0/0x220 el0_svc+0xec/0xf0 el0t_64_sync_handler+0xa0/0xe8 el0t_64_sync+0x1ac/0x1b0 The reason is that trace_get_user will fail when processing a string longer than FTRACE_BUFF_MAX, but not set the end of parser->buffer to 0. Then an OOB access will be triggered in ftrace_regex_release-> ftrace_process_regex->strsep->strpbrk. We can solve this problem by limiting access to parser->buffer when trace_get_user failed.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 634684d79733124f7470b226b0f42aada4426b07 , < b842ef39c2ad6156c13afdec25ecc6792a9b67b9 (git)
Affected: 8c9af478c06bb1ab1422f90d8ecbc53defd44bc3 , < 41b838420457802f21918df66764b6fbf829d330 (git)
Affected: 8c9af478c06bb1ab1422f90d8ecbc53defd44bc3 , < 418b448e1d7470da9d4d4797f71782595ee69c49 (git)
Affected: 8c9af478c06bb1ab1422f90d8ecbc53defd44bc3 , < 58ff8064cb4c7eddac4da1a59da039ead586950a (git)
Affected: 8c9af478c06bb1ab1422f90d8ecbc53defd44bc3 , < d0c68045b8b0f3737ed7bd6b8c83b7887014adee (git)
Affected: 8c9af478c06bb1ab1422f90d8ecbc53defd44bc3 , < 3079517a5ba80901fe828a06998da64b9b8749be (git)
Affected: 8c9af478c06bb1ab1422f90d8ecbc53defd44bc3 , < 6a909ea83f226803ea0e718f6e88613df9234d58 (git)
Affected: 24cd31752f47699b89b4b3471155c8e599a1a23a (git)
Affected: e9cb474de7ff7a970c2a3951c12ec7e3113c0c35 (git)
Affected: 6ab671191f64b0da7d547e2ad4dc199ca7e5b558 (git)
Affected: 3d9281a4ac7171c808f9507f0937eb236b353905 (git)
Affected: 0b641b25870f02e2423e494365fc5243cc1e2759 (git)
Affected: ffd51dbfd2900e50c71b5c069fe407957e52d61f (git)
Affected: cdd107d7f18158d966c2bc136204fe826dac445c (git)
Create a notification for this product.
Linux Linux Affected: 5.13
Unaffected: 0 , < 5.13 (semver)
Unaffected: 5.10.241 , ≤ 5.10.* (semver)
Unaffected: 5.15.190 , ≤ 5.15.* (semver)
Unaffected: 6.1.149 , ≤ 6.1.* (semver)
Unaffected: 6.6.103 , ≤ 6.6.* (semver)
Unaffected: 6.12.44 , ≤ 6.12.* (semver)
Unaffected: 6.16.4 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Limit access to parser-\u003ebuffer when trace_get_user failed\n\nWhen the length of the string written to set_ftrace_filter exceeds\nFTRACE_BUFF_MAX, the following KASAN alarm will be triggered:\n\nBUG: KASAN: slab-out-of-bounds in strsep+0x18c/0x1b0\nRead of size 1 at addr ffff0000d00bd5ba by task ash/165\n\nCPU: 1 UID: 0 PID: 165 Comm: ash Not tainted 6.16.0-g6bcdbd62bd56-dirty\nHardware name: linux,dummy-virt (DT)\nCall trace:\n show_stack+0x34/0x50 (C)\n dump_stack_lvl+0xa0/0x158\n print_address_description.constprop.0+0x88/0x398\n print_report+0xb0/0x280\n kasan_report+0xa4/0xf0\n __asan_report_load1_noabort+0x20/0x30\n strsep+0x18c/0x1b0\n ftrace_process_regex.isra.0+0x100/0x2d8\n ftrace_regex_release+0x484/0x618\n __fput+0x364/0xa58\n ____fput+0x28/0x40\n task_work_run+0x154/0x278\n do_notify_resume+0x1f0/0x220\n el0_svc+0xec/0xf0\n el0t_64_sync_handler+0xa0/0xe8\n el0t_64_sync+0x1ac/0x1b0\n\nThe reason is that trace_get_user will fail when processing a string\nlonger than FTRACE_BUFF_MAX, but not set the end of parser-\u003ebuffer to 0.\nThen an OOB access will be triggered in ftrace_regex_release-\u003e\nftrace_process_regex-\u003estrsep-\u003estrpbrk. We can solve this problem by\nlimiting access to parser-\u003ebuffer when trace_get_user failed."
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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-39683\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-05T18:15:44.810\",\"lastModified\":\"2026-05-12T13:17:04.540\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ntracing: Limit access to parser-\u003ebuffer when trace_get_user failed\\n\\nWhen the length of the string written to set_ftrace_filter exceeds\\nFTRACE_BUFF_MAX, the following KASAN alarm will be triggered:\\n\\nBUG: KASAN: slab-out-of-bounds in strsep+0x18c/0x1b0\\nRead of size 1 at addr ffff0000d00bd5ba by task ash/165\\n\\nCPU: 1 UID: 0 PID: 165 Comm: ash Not tainted 6.16.0-g6bcdbd62bd56-dirty\\nHardware name: linux,dummy-virt (DT)\\nCall trace:\\n show_stack+0x34/0x50 (C)\\n dump_stack_lvl+0xa0/0x158\\n print_address_description.constprop.0+0x88/0x398\\n print_report+0xb0/0x280\\n kasan_report+0xa4/0xf0\\n __asan_report_load1_noabort+0x20/0x30\\n strsep+0x18c/0x1b0\\n ftrace_process_regex.isra.0+0x100/0x2d8\\n ftrace_regex_release+0x484/0x618\\n __fput+0x364/0xa58\\n ____fput+0x28/0x40\\n task_work_run+0x154/0x278\\n do_notify_resume+0x1f0/0x220\\n el0_svc+0xec/0xf0\\n el0t_64_sync_handler+0xa0/0xe8\\n el0t_64_sync+0x1ac/0x1b0\\n\\nThe reason is that trace_get_user will fail when processing a string\\nlonger than FTRACE_BUFF_MAX, but not set the end of parser-\u003ebuffer to 0.\\nThen an OOB access will be triggered in ftrace_regex_release-\u003e\\nftrace_process_regex-\u003estrsep-\u003estrpbrk. We can solve this problem by\\nlimiting access to parser-\u003ebuffer when trace_get_user failed.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H\",\"baseScore\":7.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.2}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-125\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.4.269\",\"versionEndExcluding\":\"4.5\",\"matchCriteriaId\":\"1A17D1FB-0B85-43ED-87BE-7BB15922086E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.9.269\",\"versionEndExcluding\":\"4.10\",\"matchCriteriaId\":\"5DA6B5DF-C354-4293-AF20-6294DC3DFAC0\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.14.233\",\"versionEndExcluding\":\"4.15\",\"matchCriteriaId\":\"FC28E42D-3C4C-4E0A-A1A4-FB2471BB20B0\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.19.191\",\"versionEndExcluding\":\"4.20\",\"matchCriteriaId\":\"FEB61259-1CF1-4791-8D81-F5ED7CEBE348\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.4.118\",\"versionEndExcluding\":\"5.5\",\"matchCriteriaId\":\"D7B7175E-AD40-460B-A504-676A7F85F2BD\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.10.36\",\"versionEndExcluding\":\"5.10.241\",\"matchCriteriaId\":\"253602A1-BDF5-4DC3-A3F0-D06592A0F936\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11.20\",\"versionEndExcluding\":\"5.12\",\"matchCriteriaId\":\"CC8679E8-F4E0-4BBF-8682-F0CDCBC99C1E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.12.3\",\"versionEndExcluding\":\"5.15.190\",\"matchCriteriaId\":\"DCD56E21-B3AB-4991-B8CC-53E096B575BC\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.149\",\"matchCriteriaId\":\"FDBE8280-8983-4D2D-943D-2E6D0104E2D8\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.103\",\"matchCriteriaId\":\"F2293654-7169-49B5-8D0D-EE51EF8B8E48\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.44\",\"matchCriteriaId\":\"12351F24-1133-4775-960C-F2B47E81298B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.16.4\",\"matchCriteriaId\":\"AFC28995-B8C3-4B68-8CB6-78E792B6629D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"327D22EF-390B-454C-BD31-2ED23C998A1C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"C730CD9A-D969-4A8E-9522-162AAF7C0EE9\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"FA6FEEC2-9F11-4643-8827-749718254FED\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3079517a5ba80901fe828a06998da64b9b8749be\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/418b448e1d7470da9d4d4797f71782595ee69c49\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/41b838420457802f21918df66764b6fbf829d330\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/58ff8064cb4c7eddac4da1a59da039ead586950a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/6a909ea83f226803ea0e718f6e88613df9234d58\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b842ef39c2ad6156c13afdec25ecc6792a9b67b9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d0c68045b8b0f3737ed7bd6b8c83b7887014adee\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-032379.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-082556.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"}]}}"
  }
}


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Tags
Taxonomy of the tags.




Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

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.