{"cve":"CVE-2023-53023","nvd":{"published":"2025-03-27T17:15:51.847","modified":"2026-06-17T06:44:08.647","status":"Analyzed","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: nfc: Fix use-after-free in local_cleanup()\n\nFix a use-after-free that occurs in kfree_skb() called from\nlocal_cleanup(). This could happen when killing nfc daemon (e.g. neard)\nafter detaching an nfc device.\nWhen detaching an nfc device, local_cleanup() called from\nnfc_llcp_unregister_device() frees local->rx_pending and decreases\nlocal->ref by kref_put() in nfc_llcp_local_put().\nIn the terminating process, nfc daemon releases all sockets and it leads\nto decreasing local->ref. After the last release of local->ref,\nlocal_cleanup() called from local_release() frees local->rx_pending\nagain, which leads to the bug.\n\nSetting local->rx_pending to NULL in local_cleanup() could prevent\nuse-after-free when local_cleanup() is called twice.\n\nFound by a modified version of syzkaller.\n\nBUG: KASAN: use-after-free in kfree_skb()\n\nCall Trace:\ndump_stack_lvl (lib/dump_stack.c:106)\nprint_address_description.constprop.0.cold (mm/kasan/report.c:306)\nkasan_check_range (mm/kasan/generic.c:189)\nkfree_skb (net/core/skbuff.c:955)\nlocal_cleanup (net/nfc/llcp_core.c:159)\nnfc_llcp_local_put.part.0 (net/nfc/llcp_core.c:172)\nnfc_llcp_local_put (net/nfc/llcp_core.c:181)\nllcp_sock_destruct (net/nfc/llcp_sock.c:959)\n__sk_destruct (net/core/sock.c:2133)\nsk_destruct (net/core/sock.c:2181)\n__sk_free (net/core/sock.c:2192)\nsk_free (net/core/sock.c:2203)\nllcp_sock_release (net/nfc/llcp_sock.c:646)\n__sock_release (net/socket.c:650)\nsock_close (net/socket.c:1365)\n__fput (fs/file_table.c:306)\ntask_work_run (kernel/task_work.c:179)\nptrace_notify (kernel/signal.c:2354)\nsyscall_exit_to_user_mode_prepare (kernel/entry/common.c:278)\nsyscall_exit_to_user_mode (kernel/entry/common.c:296)\ndo_syscall_64 (arch/x86/entry/common.c:86)\nentry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:106)\n\nAllocated by task 4719:\nkasan_save_stack (mm/kasan/common.c:45)\n__kasan_slab_alloc (mm/kasan/common.c:325)\nslab_post_alloc_hook (mm/slab.h:766)\nkmem_cache_alloc_node (mm/slub.c:3497)\n__alloc_skb (net/core/skbuff.c:552)\npn533_recv_response (drivers/nfc/pn533/usb.c:65)\n__usb_hcd_giveback_urb (drivers/usb/core/hcd.c:1671)\nusb_giveback_urb_bh (drivers/usb/core/hcd.c:1704)\ntasklet_action_common.isra.0 (kernel/softirq.c:797)\n__do_softirq (kernel/softirq.c:571)\n\nFreed by task 1901:\nkasan_save_stack (mm/kasan/common.c:45)\nkasan_set_track (mm/kasan/common.c:52)\nkasan_save_free_info (mm/kasan/genericdd.c:518)\n__kasan_slab_free (mm/kasan/common.c:236)\nkmem_cache_free (mm/slub.c:3809)\nkfree_skbmem (net/core/skbuff.c:874)\nkfree_skb (net/core/skbuff.c:931)\nlocal_cleanup (net/nfc/llcp_core.c:159)\nnfc_llcp_unregister_device (net/nfc/llcp_core.c:1617)\nnfc_unregister_device (net/nfc/core.c:1179)\npn53x_unregister_nfc (drivers/nfc/pn533/pn533.c:2846)\npn533_usb_disconnect (drivers/nfc/pn533/usb.c:579)\nusb_unbind_interface (drivers/usb/core/driver.c:458)\ndevice_release_driver_internal (drivers/base/dd.c:1279)\nbus_remove_device (drivers/base/bus.c:529)\ndevice_del (drivers/base/core.c:3665)\nusb_disable_device (drivers/usb/core/message.c:1420)\nusb_disconnect (drivers/usb/core.c:2261)\nhub_event (drivers/usb/core/hub.c:5833)\nprocess_one_work (arch/x86/include/asm/jump_label.h:27 include/linux/jump_label.h:212 include/trace/events/workqueue.h:108 kernel/workqueue.c:2281)\nworker_thread (include/linux/list.h:282 kernel/workqueue.c:2423)\nkthread (kernel/kthread.c:319)\nret_from_fork (arch/x86/entry/entry_64.S:301)","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":["CWE-416"],"references":["https://git.kernel.org/stable/c/4bb4db7f3187c6e3de6b229ffc87cdb30a2d22b6","https://git.kernel.org/stable/c/54f7be61584b8ec4c6df405f479495b9397bae4a","https://git.kernel.org/stable/c/7f129927feaf7c10b1c38bbce630172e9a08c834","https://git.kernel.org/stable/c/a59cdbda3714e11aa3ab579132864c4c8c6d54f9","https://git.kernel.org/stable/c/ad1baab3a5c03692d22ce446f38596a126377f6a"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:00:28.034033815+00:00"},"epss":{"cve":"CVE-2023-53023","score":0.00196,"percentile":0.09327,"date":"2026-11-01"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}