{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-21943",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-21943"
  ],
  "published": "2025-04-01T15:40:16Z",
  "summary": "gpio: aggregator: protect driver attr handlers against module unload",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ngpio: aggregator: protect driver attr handlers against module unload\n\nBoth new_device_store and delete_device_store touch module global\nresources (e.g. gpio_aggregator_lock). To prevent race conditions with\nmodule unload, a reference needs to be held.\n\nAdd try_module_get() in these handlers.\n\nFor new_device_store, this eliminates what appears to be the most dangerous\nscenario: if an id is allocated from gpio_aggregator_idr but\nplatform_device_register has not yet been called or completed, a concurrent\nmodule unload could fail to unregister/delete the device, leaving behind a\ndangling platform device/GPIO forwarder. This can result in various issues.\nThe following simple reproducer demonstrates these problems:\n\n  #!/bin/bash\n  while :; do\n    # note: whether 'gpiochip0 0' exists or not does not matter.\n    echo 'gpiochip0 0' > /sys/bus/platform/drivers/gpio-aggregator/new_device\n  done &\n  while :; do\n    modprobe gpio-aggregator\n    modprobe -r gpio-aggregator\n  done &\n  wait\n\n  Starting with the following warning, several kinds of warnings will appear\n  and the system may become unstable:\n\n  ------------[ cut here ]------------\n  list_del corruption, ffff888103e2e980->next is LIST_POISON1 (dead000000000100)\n  WARNING: CPU: 1 PID: 1327 at lib/list_debug.c:56 __list_del_entry_valid_or_report+0xa3/0x120\n  [...]\n  RIP: 0010:__list_del_entry_valid_or_report+0xa3/0x120\n  [...]\n  Call Trace:\n   <TASK>\n   ? __list_del_entry_valid_or_report+0xa3/0x120\n   ? __warn.cold+0x93/0xf2\n   ? __list_del_entry_valid_or_report+0xa3/0x120\n   ? report_bug+0xe6/0x170\n   ? __irq_work_queue_local+0x39/0xe0\n   ? handle_bug+0x58/0x90\n   ? exc_invalid_op+0x13/0x60\n   ? asm_exc_invalid_op+0x16/0x20\n   ? __list_del_entry_valid_or_report+0xa3/0x120\n   gpiod_remove_lookup_table+0x22/0x60\n   new_device_store+0x315/0x350 [gpio_aggregator]\n   kernfs_fop_write_iter+0x137/0x1f0\n   vfs_write+0x262/0x430\n   ksys_write+0x60/0xd0\n   do_syscall_64+0x6c/0x180\n   entry_SYSCALL_64_after_hwframe+0x76/0x7e\n   [...]\n   </TASK>\n  ---[ end trace 0000000000000000 ]---",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.131",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-21943"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fd6aa1f8cbe0979eb66ac32ebc231bf0b10a2117"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/807789018186cf508ceb3a1f8f02935cd195717b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9334c88fc2fbc6836b307d269fcc1744c69701c0"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d99dc8f7ea01ee1b21306e0eda8eb18a4af80db6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8fb07fb1bba91d45846ed8605c3097fe67a7d54c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/56281a76b805b5ac61feb5d580139695a22f87f0"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/12f65d1203507f7db3ba59930fe29a3b8eee9945"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}