{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-39683",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2025-39683"
  ],
  "published": "2025-09-05T17:22:05Z",
  "summary": "tracing: Limit access to parser->buffer when trace_get_user failed",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Limit access to parser->buffer 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->buffer to 0.\nThen an OOB access will be triggered in ftrace_regex_release->\nftrace_process_regex->strsep->strpbrk. We can solve this problem by\nlimiting access to parser->buffer when trace_get_user failed.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-39683"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b842ef39c2ad6156c13afdec25ecc6792a9b67b9"
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      "url": "https://git.kernel.org/stable/c/41b838420457802f21918df66764b6fbf829d330"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/418b448e1d7470da9d4d4797f71782595ee69c49"
    },
    {
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      "url": "https://git.kernel.org/stable/c/58ff8064cb4c7eddac4da1a59da039ead586950a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d0c68045b8b0f3737ed7bd6b8c83b7887014adee"
    },
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      "url": "https://git.kernel.org/stable/c/3079517a5ba80901fe828a06998da64b9b8749be"
    },
    {
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      "url": "https://git.kernel.org/stable/c/6a909ea83f226803ea0e718f6e88613df9234d58"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T12:19:11Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - Exploitation requires local access to write and then close the tracefs file /sys/kernel/tracing/set_ftrace_filter (or set_ftrace_notrace / set_graph_function); there is no remote or adjacent-network path to trace_get_user().\nAC:L - A single deterministic sequence \u2014 open the filter file, write one token longer than FTRACE_BUFF_MAX (670), close it \u2014 always leaves the parser buffer unterminated and drives strsep() past the allocation; the heap slack that determines how far the over-read runs is itself groomable by the attacker via ordinary kmalloc-1024 spray/free.\nPR:L - The kernel imposes no capability check on ftrace_regex_open/write/release \u2014 access is gated purely by tracefs file permissions, and real deployments grant them to unprivileged users (Android chowns the ftrace filter files to the shell user for \"atrace -k\", and embedded/automotive/ChromeOS images mount tracefs with gid= for a tracing group).\nUI:N - The attacker triggers everything itself; the OOB access happens in ftrace_regex_release() during the attacker's own close()/exit, with no victim action required.\nS:U - The over-read and NUL over-write stay within kernel slab memory in the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - strpbrk() reads an unbounded amount of heap memory past the 670-byte allocation until it happens to hit a ':' or NUL, and the bytes it traverses influence the subsequent command strcmp/dispatch, so this is an unbounded out-of-bounds read of adjacent slab objects rather than a strictly bounded few-byte over-read.\nI:H - When the ':' delimiter is located outside the allocation, strsep() executes *end++ = '\\0', writing a NUL byte out of bounds into a neighbouring heap object at an offset the attacker can influence through heap grooming \u2014 a classic single-null-byte heap-corruption primitive usable to corrupt adjacent object metadata.\nA:H - The unterminated-string walk produces a KASAN slab-out-of-bounds report (panic under panic_on_warn) and can run off the end of the slab page into unmapped memory, causing a kernel oops; the resulting adjacent-object corruption can also crash the kernel later."
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}