{"schema_version":"1.9.0","id":"CVE-2023-53234","published":"2025-09-15T14:22:07.219Z","modified":"2026-08-12T03:51:31.188521679Z","related":["SUSE-SU-2025:03615-1","SUSE-SU-2025:03628-1","SUSE-SU-2025:3716-1","SUSE-SU-2025:3761-1"],"summary":"watchdog: Fix kmemleak in watchdog_cdev_register","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nwatchdog: Fix kmemleak in watchdog_cdev_register\n\nkmemleak reports memory leaks in watchdog_dev_register, as follows:\nunreferenced object 0xffff888116233000 (size 2048):\n  comm \"\"modprobe\"\", pid 28147, jiffies 4353426116 (age 61.741s)\n  hex dump (first 32 bytes):\n    80 fa b9 05 81 88 ff ff 08 30 23 16 81 88 ff ff  .........0#.....\n    08 30 23 16 81 88 ff ff 00 00 00 00 00 00 00 00  .0#.............\n  backtrace:\n    [<000000007f001ffd>] __kmem_cache_alloc_node+0x157/0x220\n    [<000000006a389304>] kmalloc_trace+0x21/0x110\n    [<000000008d640eea>] watchdog_dev_register+0x4e/0x780 [watchdog]\n    [<0000000053c9f248>] __watchdog_register_device+0x4f0/0x680 [watchdog]\n    [<00000000b2979824>] watchdog_register_device+0xd2/0x110 [watchdog]\n    [<000000001f730178>] 0xffffffffc10880ae\n    [<000000007a1a8bcc>] do_one_initcall+0xcb/0x4d0\n    [<00000000b98be325>] do_init_module+0x1ca/0x5f0\n    [<0000000046d08e7c>] load_module+0x6133/0x70f0\n    ...\n\nunreferenced object 0xffff888105b9fa80 (size 16):\n  comm \"\"modprobe\"\", pid 28147, jiffies 4353426116 (age 61.741s)\n  hex dump (first 16 bytes):\n    77 61 74 63 68 64 6f 67 31 00 b9 05 81 88 ff ff  watchdog1.......\n  backtrace:\n    [<000000007f001ffd>] __kmem_cache_alloc_node+0x157/0x220\n    [<00000000486ab89b>] __kmalloc_node_track_caller+0x44/0x1b0\n    [<000000005a39aab0>] kvasprintf+0xb5/0x140\n    [<0000000024806f85>] kvasprintf_const+0x55/0x180\n    [<000000009276cb7f>] kobject_set_name_vargs+0x56/0x150\n    [<00000000a92e820b>] dev_set_name+0xab/0xe0\n    [<00000000cec812c6>] watchdog_dev_register+0x285/0x780 [watchdog]\n    [<0000000053c9f248>] __watchdog_register_device+0x4f0/0x680 [watchdog]\n    [<00000000b2979824>] watchdog_register_device+0xd2/0x110 [watchdog]\n    [<000000001f730178>] 0xffffffffc10880ae\n    [<000000007a1a8bcc>] do_one_initcall+0xcb/0x4d0\n    [<00000000b98be325>] do_init_module+0x1ca/0x5f0\n    [<0000000046d08e7c>] load_module+0x6133/0x70f0\n    ...\n\nThe reason is that put_device is not be called if cdev_device_add fails\nand wdd->id != 0.\n\nwatchdog_cdev_register\n  wd_data = kzalloc                             [1]\n  err = dev_set_name                            [2]\n  ..\n  err = cdev_device_add\n  if (err) {\n    if (wdd->id == 0) {  // wdd->id != 0\n      ..\n    }\n    return err;  // [1],[2] would be leaked\n\nTo fix it, call put_device in all wdd->id 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