{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-40028",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-40028"
  ],
  "published": "2025-10-28T09:32:47Z",
  "summary": "binder: fix double-free in dbitmap",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbinder: fix double-free in dbitmap\n\nA process might fail to allocate a new bitmap when trying to expand its\nproc->dmap. In that case, dbitmap_grow() fails and frees the old bitmap\nvia dbitmap_free(). However, the driver calls dbitmap_free() again when\nthe same process terminates, leading to a double-free error:\n\n  ==================================================================\n  BUG: KASAN: double-free in binder_proc_dec_tmpref+0x2e0/0x55c\n  Free of addr ffff00000b7c1420 by task kworker/9:1/209\n\n  CPU: 9 UID: 0 PID: 209 Comm: kworker/9:1 Not tainted 6.17.0-rc6-dirty #5 PREEMPT\n  Hardware name: linux,dummy-virt (DT)\n  Workqueue: events binder_deferred_func\n  Call trace:\n   kfree+0x164/0x31c\n   binder_proc_dec_tmpref+0x2e0/0x55c\n   binder_deferred_func+0xc24/0x1120\n   process_one_work+0x520/0xba4\n  [...]\n\n  Allocated by task 448:\n   __kmalloc_noprof+0x178/0x3c0\n   bitmap_zalloc+0x24/0x30\n   binder_open+0x14c/0xc10\n  [...]\n\n  Freed by task 449:\n   kfree+0x184/0x31c\n   binder_inc_ref_for_node+0xb44/0xe44\n   binder_transaction+0x29b4/0x7fbc\n   binder_thread_write+0x1708/0x442c\n   binder_ioctl+0x1b50/0x2900\n  [...]\n  ==================================================================\n\nFix this issue by marking proc->map NULL in dbitmap_free().",
  "affected": [
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        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-40028"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c301ec61ce6f16e21a36b99225ca8a20c1591e10"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0390633979969c54c0ce6a198d6f45cdbe2c84b1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b781e5635a3398e2b64440371233c2c5102cd6cb"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3ebcd3460cad351f198c39c6edb4af519a0ed934"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T12:19:11Z"
  }
}