{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-68187",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-68187"
  ],
  "published": "2026-08-10T12:08:00Z",
  "summary": "exec: fix unsigned loop counter wrap in transfer_args_to_stack()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nexec: fix unsigned loop counter wrap in transfer_args_to_stack()\n\nThe stop value is derived from bprm->p >> PAGE_SHIFT. The index variable\nis an unsigned long. If bprm->p drops below PAGE_SIZE and stop becomes\nzero the loop condition index >= stop is always true.\n\nAfter the index == 0 iteration the decrement wraps to ULONG_MAX and\nbprm->page[ULONG_MAX] reads sizeof(void *) bytes in front of the array.\nThe pointer has wrapped to -1. That garbage pointer is then passed to\nkmap_local_page() and PAGE_SIZE bytes are copied from wherever that\nlands into the stack of the process being created. And the loop doesn't\nterminate either...\n\nGetting there only requires bprm->p < PAGE_SIZE. On !MMU\nbprm_set_stack_limit() and bprm_hit_stack_limit() are empty. So the only\nconstraint on how far bprm->p is pushed down is valid_arg_len(), i.e.\nthat each individual string still fits in what is left.\n\nbprm->p starts at PAGE_SIZE * MAX_ARG_PAGES - sizeof(void *) so a\nsingle argument or environment string of a little over 31 pages leaves\nit in the first page:\n\n  Oops - load access fault [#1]\n  CPU: 0 UID: 0 PID: 1 Comm: victim Not tainted 7.2.0-rc4 #1\n  epc : __memcpy+0xd4/0xf8\n   ra : transfer_args_to_stack+0xaa/0xae\n   s4 : ffffffffffffffff   s2 : 0000000000000000\n   a1 : ffffffdc98000000   a2 : 0000000000001000\n  status: 0000000a00001880 badaddr: ffffffdc98000000 cause: 0000000000000005\n  [<801a5324>] __memcpy+0xd4/0xf8\n  [<800d5f6a>] load_flat_binary+0x43a/0x65e\n  [<800a2de4>] bprm_execve+0x1d4/0x316\n  [<800a351a>] do_execveat_common+0x12e/0x138\n  [<800a3d44>] __riscv_sys_execve+0x38/0x4e\n  Kernel panic - not syncing: Fatal exception in interrupt\n\nThis is an arcane bug but we should still fix it.\n\nCount down from MAX_ARG_PAGES so the loop ends when index reaches stop,\nstop == 0 included. The iterations performed are unchanged for every\nother value of stop.\n\nOnly CONFIG_MMU=n builds are affected, transfer_args_to_stack() is used\nby binfmt_flat and binfmt_elf_fdpic on nommu only.\n\nThe loop predates git history. commit 7e7ec6a93434\n(\"elf_fdpic_transfer_args_to_stack(): make it generic\") only moved it\nfrom binfmt_elf_fdpic.c into fs/exec.c and narrowed the copy to the used\npart of the first page. The condition and the decrement are unchanged\nfrom 2.6.12-rc2.",
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}