{
  "cveId": "CVE-2023-53138",
  "url": "https://patchblox.com/security/cve/CVE-2023-53138",
  "summary": "CVE-2023-53138 is fixed in linux on 1 platform, first by DEBIAN-CVE-2023-53138, released May 2, 2025. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  net: caif: Fix use-after-free in cfusbl_device_n...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  net: caif: Fix use-after-free in cfusbl_device_notify()  syzbot reported use-after-free in cfusbl_device_notify() [1].  This causes a stack trace like below:  BUG: KASAN: use-after-free in cfusbl_device_notify\u002B0x7c9/0x870 net/caif/caif_usb.c:138 Read of size 8 at addr ffff88807ac4e6f0 by task kworker/u4:6/1214  CPU: 0 PID: 1214 Comm: kworker/u4:6 Not tainted 5.19.0-rc3-syzkaller-00146-g92f20ff72066 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net Call Trace:  \u003CTASK\u003E  __dump_stack lib/dump_stack.c:88 [inline]  dump_stack_lvl\u002B0xcd/0x134 lib/dump_stack.c:106  print_address_description.constprop.0.cold\u002B0xeb/0x467 mm/kasan/report.c:313  print_report mm/kasan/report.c:429 [inline]  kasan_report.cold\u002B0xf4/0x1c6 mm/kasan/report.c:491  cfusbl_device_notify\u002B0x7c9/0x870 net/caif/caif_usb.c:138  notifier_call_chain\u002B0xb5/0x200 kernel/notifier.c:87  call_netdevice_notifiers_info\u002B0xb5/0x130 net/core/dev.c:1945  call_netdevice_notifiers_extack net/core/dev.c:1983 [inline]  call_netdevice_notifiers net/core/dev.c:1997 [inline]  netdev_wait_allrefs_any net/core/dev.c:10227 [inline]  netdev_run_todo\u002B0xbc0/0x10f0 net/core/dev.c:10341  default_device_exit_batch\u002B0x44e/0x590 net/core/dev.c:11334  ops_exit_list\u002B0x125/0x170 net/core/net_namespace.c:167  cleanup_net\u002B0x4ea/0xb00 net/core/net_namespace.c:594  process_one_work\u002B0x996/0x1610 kernel/workqueue.c:2289  worker_thread\u002B0x665/0x1080 kernel/workqueue.c:2436  kthread\u002B0x2e9/0x3a0 kernel/kthread.c:376  ret_from_fork\u002B0x1f/0x30 arch/x86/entry/entry_64.S:302  \u003C/TASK\u003E  When unregistering a net device, unregister_netdevice_many_notify() sets the device\u0027s reg_state to NETREG_UNREGISTERING, calls notifiers with NETDEV_UNREGISTER, and adds the device to the todo list.  Later on, devices in the todo list are processed by netdev_run_todo(). netdev_run_todo() waits devices\u0027 reference count become 1 while rebdoadcasting NETDEV_UNREGISTER notification.  When cfusbl_device_notify() is called with NETDEV_UNREGISTER multiple times, the parent device might be freed.  This could cause UAF. Processing NETDEV_UNREGISTER multiple times also causes inbalance of reference count for the module.  This patch fixes the issue by accepting only first NETDEV_UNREGISTER notification.",
  "published": "2025-05-02T16:15:32Z",
  "severity": "high",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00193,
  "epssPercentile": 0.09046,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.1.20-1",
      "fix": "DEBIAN-CVE-2023-53138",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-53138",
      "released": "2025-05-02T16:15:32Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.1.20-1",
      "fix": "DEBIAN-CVE-2023-53138",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-53138",
      "released": "2025-05-02T16:15:32Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.1.20-1",
      "fix": "DEBIAN-CVE-2023-53138",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-53138",
      "released": "2025-05-02T16:15:32Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}