{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23150","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-01-13T15:37:45.976Z","datePublished":"2026-02-14T16:01:18.968Z","dateUpdated":"2026-05-11T22:01:10.727Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T22:01:10.727Z"},"descriptions":[{"lang":"en","value":"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---"}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/nfc/llcp_commands.c","net/nfc/llcp_core.c"],"versions":[{"version":"94f418a206648c9be6fd84d6681d6956b8f8b106","lessThan":"ab660cb8e17aa93426d1e821c2cce60e4b9bc56a","status":"affected","versionType":"git"},{"version":"94f418a206648c9be6fd84d6681d6956b8f8b106","lessThan":"65e976e1f474ae3bf5681d7abafb8f3fdb34b8cc","status":"affected","versionType":"git"},{"version":"94f418a206648c9be6fd84d6681d6956b8f8b106","lessThan":"6734ff1ac6beba1d0c22dc9a3dc1849b773b511f","status":"affected","versionType":"git"},{"version":"94f418a206648c9be6fd84d6681d6956b8f8b106","lessThan":"f8d002626d434f5fea9085e2557711c16a15cec6","status":"affected","versionType":"git"},{"version":"94f418a206648c9be6fd84d6681d6956b8f8b106","lessThan":"3098e5c8af0f4c8f7eebbb370798df8aa2e12ba5","status":"affected","versionType":"git"},{"version":"94f418a206648c9be6fd84d6681d6956b8f8b106","lessThan":"61858cbce6ca4bef9ed116c689a4be9520841339","status":"affected","versionType":"git"},{"version":"94f418a206648c9be6fd84d6681d6956b8f8b106","lessThan":"165c34fb6068ff153e3fc99a932a80a9d5755709","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/nfc/llcp_commands.c","net/nfc/llcp_core.c"],"versions":[{"version":"3.8","status":"affected"},{"version":"0","lessThan":"3.8","status":"unaffected","versionType":"semver"},{"version":"5.10.249","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.199","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.162","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.123","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.69","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.9","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"6.19","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.8","versionEndExcluding":"5.10.249"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.8","versionEndExcluding":"5.15.199"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.8","versionEndExcluding":"6.1.162"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.8","versionEndExcluding":"6.6.123"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.8","versionEndExcluding":"6.12.69"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.8","versionEndExcluding":"6.18.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.8","versionEndExcluding":"6.19"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/ab660cb8e17aa93426d1e821c2cce60e4b9bc56a"},{"url":"https://git.kernel.org/stable/c/65e976e1f474ae3bf5681d7abafb8f3fdb34b8cc"},{"url":"https://git.kernel.org/stable/c/6734ff1ac6beba1d0c22dc9a3dc1849b773b511f"},{"url":"https://git.kernel.org/stable/c/f8d002626d434f5fea9085e2557711c16a15cec6"},{"url":"https://git.kernel.org/stable/c/3098e5c8af0f4c8f7eebbb370798df8aa2e12ba5"},{"url":"https://git.kernel.org/stable/c/61858cbce6ca4bef9ed116c689a4be9520841339"},{"url":"https://git.kernel.org/stable/c/165c34fb6068ff153e3fc99a932a80a9d5755709"}],"title":"nfc: llcp: Fix memleak in nfc_llcp_send_ui_frame().","x_generator":{"engine":"bippy-1.2.0"}}}}