{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-23150",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-23150"
  ],
  "published": "2026-02-14T16:05:08Z",
  "summary": "nfc: llcp: Fix memleak in nfc_llcp_send_ui_frame().",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: llcp: Fix memleak in nfc_llcp_send_ui_frame().\n\nsyzbot reported various memory leaks related to NFC, struct\nnfc_llcp_sock, sk_buff, nfc_dev, etc. [0]\n\nThe leading log hinted that nfc_llcp_send_ui_frame() failed\nto allocate skb due to sock_error(sk) being -ENXIO.\n\nENXIO is set by nfc_llcp_socket_release() when struct\nnfc_llcp_local is destroyed by local_cleanup().\n\nThe problem is that there is no synchronisation between\nnfc_llcp_send_ui_frame() and local_cleanup(), and skb\ncould be put into local->tx_queue after it was purged in\nlocal_cleanup():\n\n  CPU1                          CPU2\n  ----                          ----\n  nfc_llcp_send_ui_frame()      local_cleanup()\n  |- do {                       '\n     |- pdu = nfc_alloc_send_skb(..., &err)\n     |                          .\n     |                          |- nfc_llcp_socket_release(local, false, ENXIO);\n     |                          |- skb_queue_purge(&local->tx_queue);      |\n     |                          '                                          |\n     |- skb_queue_tail(&local->tx_queue, pdu);                             |\n    ...                                                                    |\n     |- pdu = nfc_alloc_send_skb(..., &err)                                |\n                                       ^._________________________________.'\n\nlocal_cleanup() is called for struct nfc_llcp_local only\nafter nfc_llcp_remove_local() unlinks it from llcp_devices.\n\nIf we hold local->tx_queue.lock then, we can synchronise\nthe thread and nfc_llcp_send_ui_frame().\n\nLet's do that and check list_empty(&local->list) before\nqueuing skb to local->tx_queue in nfc_llcp_send_ui_frame().\n\n[0]:\n[   56.074943][ T6096] llcp: nfc_llcp_send_ui_frame: Could not allocate PDU (error=-6)\n[   64.318868][ T5813] kmemleak: 6 new suspected memory leaks (see /sys/kernel/debug/kmemleak)\nBUG: memory leak\nunreferenced object 0xffff8881272f6800 (size 1024):\n  comm \"syz.0.17\", pid 6096, jiffies 4294942766\n  hex dump (first 32 bytes):\n    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n    27 00 03 40 00 00 00 00 00 00 00 00 00 00 00 00  '..@............\n  backtrace (crc da58d84d):\n    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]\n    slab_post_alloc_hook mm/slub.c:4979 [inline]\n    slab_alloc_node mm/slub.c:5284 [inline]\n    __do_kmalloc_node mm/slub.c:5645 [inline]\n    __kmalloc_noprof+0x3e3/0x6b0 mm/slub.c:5658\n    kmalloc_noprof include/linux/slab.h:961 [inline]\n    sk_prot_alloc+0x11a/0x1b0 net/core/sock.c:2239\n    sk_alloc+0x36/0x360 net/core/sock.c:2295\n    nfc_llcp_sock_alloc+0x37/0x130 net/nfc/llcp_sock.c:979\n    llcp_sock_create+0x71/0xd0 net/nfc/llcp_sock.c:1044\n    nfc_sock_create+0xc9/0xf0 net/nfc/af_nfc.c:31\n    __sock_create+0x1a9/0x340 net/socket.c:1605\n    sock_create net/socket.c:1663 [inline]\n    __sys_socket_create net/socket.c:1700 [inline]\n    __sys_socket+0xb9/0x1a0 net/socket.c:1747\n    __do_sys_socket net/socket.c:1761 [inline]\n    __se_sys_socket net/socket.c:1759 [inline]\n    __x64_sys_socket+0x1b/0x30 net/socket.c:1759\n    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n    do_syscall_64+0xa4/0xfa0 arch/x86/entry/syscall_64.c:94\n    entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nBUG: memory leak\nunreferenced object 0xffff88810fbd9800 (size 240):\n  comm \"syz.0.17\", pid 6096, jiffies 4294942850\n  hex dump (first 32 bytes):\n    68 f0 ff 08 81 88 ff ff 68 f0 ff 08 81 88 ff ff  h.......h.......\n    00 00 00 00 00 00 00 00 00 68 2f 27 81 88 ff ff  .........h/'....\n  backtrace (crc 6cc652b1):\n    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]\n    slab_post_alloc_hook mm/slub.c:4979 [inline]\n    slab_alloc_node mm/slub.c:5284 [inline]\n    kmem_cache_alloc_node_noprof+0x36f/0x5e0 mm/slub.c:5336\n    __alloc_skb+0x203/0x240 net/core/skbuff.c:660\n    alloc_skb include/linux/skbuff.h:1383 [inline]\n    alloc_skb_with_frags+0x69/0x3f0 net/core/sk\n---truncated---",
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