CVE-2025-39683 (GCVE-0-2025-39683)
Vulnerability from cvelistv5
Published
2025-09-05 17:20
Modified
2025-11-03 17:42
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 634684d79733124f7470b226b0f42aada4426b07
Version: 8c9af478c06bb1ab1422f90d8ecbc53defd44bc3
Version: 8c9af478c06bb1ab1422f90d8ecbc53defd44bc3
Version: 8c9af478c06bb1ab1422f90d8ecbc53defd44bc3
Version: 8c9af478c06bb1ab1422f90d8ecbc53defd44bc3
Version: 8c9af478c06bb1ab1422f90d8ecbc53defd44bc3
Version: 8c9af478c06bb1ab1422f90d8ecbc53defd44bc3
Version: 24cd31752f47699b89b4b3471155c8e599a1a23a
Version: e9cb474de7ff7a970c2a3951c12ec7e3113c0c35
Version: 6ab671191f64b0da7d547e2ad4dc199ca7e5b558
Version: 3d9281a4ac7171c808f9507f0937eb236b353905
Version: 0b641b25870f02e2423e494365fc5243cc1e2759
Version: ffd51dbfd2900e50c71b5c069fe407957e52d61f
Version: cdd107d7f18158d966c2bc136204fe826dac445c
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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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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39683",
    "datePublished": "2025-09-05T17:20:49.821Z",
    "dateReserved": "2025-04-16T07:20:57.113Z",
    "dateUpdated": "2025-11-03T17:42:15.575Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-39683\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-05T18:15:44.810\",\"lastModified\":\"2025-11-03T18:16:39.083\",\"vulnStatus\":\"Awaiting Analysis\",\"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\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3079517a5ba80901fe828a06998da64b9b8749be\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/418b448e1d7470da9d4d4797f71782595ee69c49\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/41b838420457802f21918df66764b6fbf829d330\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/58ff8064cb4c7eddac4da1a59da039ead586950a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6a909ea83f226803ea0e718f6e88613df9234d58\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b842ef39c2ad6156c13afdec25ecc6792a9b67b9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d0c68045b8b0f3737ed7bd6b8c83b7887014adee\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}"
  }
}


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