{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-43900",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2024-43900"
  ],
  "published": "2024-08-26T10:22:19Z",
  "summary": "media: xc2028: avoid use-after-free in load_firmware_cb()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: xc2028: avoid use-after-free in load_firmware_cb()\n\nsyzkaller reported use-after-free in load_firmware_cb() [1].\nThe reason is because the module allocated a struct tuner in tuner_probe(),\nand then the module initialization failed, the struct tuner was released.\nA worker which created during module initialization accesses this struct\ntuner later, it caused use-after-free.\n\nThe process is as follows:\n\ntask-6504           worker_thread\ntuner_probe                             <= alloc dvb_frontend [2]\n...\nrequest_firmware_nowait                 <= create a worker\n...\ntuner_remove                            <= free dvb_frontend\n...\n                    request_firmware_work_func  <= the firmware is ready\n                    load_firmware_cb    <= but now the dvb_frontend has been freed\n\nTo fix the issue, check the dvd_frontend in load_firmware_cb(), if it is\nnull, report a warning and just return.\n\n[1]:\n    ==================================================================\n     BUG: KASAN: use-after-free in load_firmware_cb+0x1310/0x17a0\n     Read of size 8 at addr ffff8000d7ca2308 by task kworker/2:3/6504\n\n     Call trace:\n      load_firmware_cb+0x1310/0x17a0\n      request_firmware_work_func+0x128/0x220\n      process_one_work+0x770/0x1824\n      worker_thread+0x488/0xea0\n      kthread+0x300/0x430\n      ret_from_fork+0x10/0x20\n\n     Allocated by task 6504:\n      kzalloc\n      tuner_probe+0xb0/0x1430\n      i2c_device_probe+0x92c/0xaf0\n      really_probe+0x678/0xcd0\n      driver_probe_device+0x280/0x370\n      __device_attach_driver+0x220/0x330\n      bus_for_each_drv+0x134/0x1c0\n      __device_attach+0x1f4/0x410\n      device_initial_probe+0x20/0x30\n      bus_probe_device+0x184/0x200\n      device_add+0x924/0x12c0\n      device_register+0x24/0x30\n      i2c_new_device+0x4e0/0xc44\n      v4l2_i2c_new_subdev_board+0xbc/0x290\n      v4l2_i2c_new_subdev+0xc8/0x104\n      em28xx_v4l2_init+0x1dd0/0x3770\n\n     Freed by task 6504:\n      kfree+0x238/0x4e4\n      tuner_remove+0x144/0x1c0\n      i2c_device_remove+0xc8/0x290\n      __device_release_driver+0x314/0x5fc\n      device_release_driver+0x30/0x44\n      bus_remove_device+0x244/0x490\n      device_del+0x350/0x900\n      device_unregister+0x28/0xd0\n      i2c_unregister_device+0x174/0x1d0\n      v4l2_device_unregister+0x224/0x380\n      em28xx_v4l2_init+0x1d90/0x3770\n\n     The buggy address belongs to the object at ffff8000d7ca2000\n      which belongs to the cache kmalloc-2k of size 2048\n     The buggy address is located 776 bytes inside of\n      2048-byte region [ffff8000d7ca2000, ffff8000d7ca2800)\n     The buggy address belongs to the page:\n     page:ffff7fe00035f280 count:1 mapcount:0 mapping:ffff8000c001f000 index:0x0\n     flags: 0x7ff800000000100(slab)\n     raw: 07ff800000000100 ffff7fe00049d880 0000000300000003 ffff8000c001f000\n     raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000\n     page dumped because: kasan: bad access detected\n\n     Memory state around the buggy address:\n      ffff8000d7ca2200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n      ffff8000d7ca2280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n     >ffff8000d7ca2300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n                           ^\n      ffff8000d7ca2380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n      ffff8000d7ca2400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n     ==================================================================\n\n[2]\n    Actually, it is allocated for struct tuner, and dvb_frontend is inside.",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
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        "1:6.1.47-1+rpt2",
        "1:6.1.47-1+rpt4",
        "1:6.1.54-1+rpt2",
        "1:6.1.58-1+rpt2",
        "1:6.1.63-1+rpt1",
        "1:6.1.73-1+rpt1",
        "1:6.6.20-1+rpt1",
        "1:6.6.28-1+rpt1",
        "1:6.6.31-1+rpt1"
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      "ecosystem_specific": {
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            "assessment": "commit ancestry (strak rule)",
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            "assessment": "upstream version (no usable Linux commit)",
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          },
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            "assessment": "upstream version (no usable Linux commit)",
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          },
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-43900"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ef517bdfc01818419f7bd426969a0c86b14f3e0e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/850304152d367f104d21c77cfbcc05806504218b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/208deb6d8c3cb8c3acb1f41eb31cf68ea08726d5"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/68594cec291ff9523b9feb3f43fd853dcddd1f60"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}