{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-38320",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-38320"
  ],
  "published": "2025-07-10T08:18:24Z",
  "summary": "arm64/ptrace: Fix stack-out-of-bounds read in regs_get_kernel_stack_nth()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\narm64/ptrace: Fix stack-out-of-bounds read in regs_get_kernel_stack_nth()\n\nKASAN reports a stack-out-of-bounds read in regs_get_kernel_stack_nth().\n\nCall Trace:\n[   97.283505] BUG: KASAN: stack-out-of-bounds in regs_get_kernel_stack_nth+0xa8/0xc8\n[   97.284677] Read of size 8 at addr ffff800089277c10 by task 1.sh/2550\n[   97.285732]\n[   97.286067] CPU: 7 PID: 2550 Comm: 1.sh Not tainted 6.6.0+ #11\n[   97.287032] Hardware name: linux,dummy-virt (DT)\n[   97.287815] Call trace:\n[   97.288279]  dump_backtrace+0xa0/0x128\n[   97.288946]  show_stack+0x20/0x38\n[   97.289551]  dump_stack_lvl+0x78/0xc8\n[   97.290203]  print_address_description.constprop.0+0x84/0x3c8\n[   97.291159]  print_report+0xb0/0x280\n[   97.291792]  kasan_report+0x84/0xd0\n[   97.292421]  __asan_load8+0x9c/0xc0\n[   97.293042]  regs_get_kernel_stack_nth+0xa8/0xc8\n[   97.293835]  process_fetch_insn+0x770/0xa30\n[   97.294562]  kprobe_trace_func+0x254/0x3b0\n[   97.295271]  kprobe_dispatcher+0x98/0xe0\n[   97.295955]  kprobe_breakpoint_handler+0x1b0/0x210\n[   97.296774]  call_break_hook+0xc4/0x100\n[   97.297451]  brk_handler+0x24/0x78\n[   97.298073]  do_debug_exception+0xac/0x178\n[   97.298785]  el1_dbg+0x70/0x90\n[   97.299344]  el1h_64_sync_handler+0xcc/0xe8\n[   97.300066]  el1h_64_sync+0x78/0x80\n[   97.300699]  kernel_clone+0x0/0x500\n[   97.301331]  __arm64_sys_clone+0x70/0x90\n[   97.302084]  invoke_syscall+0x68/0x198\n[   97.302746]  el0_svc_common.constprop.0+0x11c/0x150\n[   97.303569]  do_el0_svc+0x38/0x50\n[   97.304164]  el0_svc+0x44/0x1d8\n[   97.304749]  el0t_64_sync_handler+0x100/0x130\n[   97.305500]  el0t_64_sync+0x188/0x190\n[   97.306151]\n[   97.306475] The buggy address belongs to stack of task 1.sh/2550\n[   97.307461]  and is located at offset 0 in frame:\n[   97.308257]  __se_sys_clone+0x0/0x138\n[   97.308910]\n[   97.309241] This frame has 1 object:\n[   97.309873]  [48, 184) 'args'\n[   97.309876]\n[   97.310749] The buggy address belongs to the virtual mapping at\n[   97.310749]  [ffff800089270000, ffff800089279000) created by:\n[   97.310749]  dup_task_struct+0xc0/0x2e8\n[   97.313347]\n[   97.313674] The buggy address belongs to the physical page:\n[   97.314604] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x14f69a\n[   97.315885] flags: 0x15ffffe00000000(node=1|zone=2|lastcpupid=0xfffff)\n[   97.316957] raw: 015ffffe00000000 0000000000000000 dead000000000122 0000000000000000\n[   97.318207] raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000\n[   97.319445] page dumped because: kasan: bad access detected\n[   97.320371]\n[   97.320694] Memory state around the buggy address:\n[   97.321511]  ffff800089277b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n[   97.322681]  ffff800089277b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n[   97.323846] >ffff800089277c00: 00 00 f1 f1 f1 f1 f1 f1 00 00 00 00 00 00 00 00\n[   97.325023]                          ^\n[   97.325683]  ffff800089277c80: 00 00 00 00 00 00 00 00 00 f3 f3 f3 f3 f3 f3 f3\n[   97.326856]  ffff800089277d00: f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n\nThis issue seems to be related to the behavior of some gcc compilers and\nwas also fixed on the s390 architecture before:\n\n commit d93a855c31b7 (\"s390/ptrace: Avoid KASAN false positives in regs_get_kernel_stack_nth()\")\n\nAs described in that commit, regs_get_kernel_stack_nth() has confirmed that\n`addr` is on the stack, so reading the value at `*addr` should be allowed.\nUse READ_ONCE_NOCHECK() helper to silence the KASAN check for this case.\n\n[will: Use '*addr' as the argument to READ_ONCE_NOCHECK()]",
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-38320"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/64773b3ea09235168a549a195cba43bb867c4a17"
    },
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      "url": "https://git.kernel.org/stable/c/39dfc971e42d886e7df01371cd1bef505076d84c"
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}