CVE-2026-23150 (GCVE-0-2026-23150)
Vulnerability from cvelistv5
Published
2026-02-14 16:01
Modified
2026-02-14 16:01
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: nfc: llcp: Fix memleak in nfc_llcp_send_ui_frame(). syzbot reported various memory leaks related to NFC, struct nfc_llcp_sock, sk_buff, nfc_dev, etc. [0] The leading log hinted that nfc_llcp_send_ui_frame() failed to allocate skb due to sock_error(sk) being -ENXIO. ENXIO is set by nfc_llcp_socket_release() when struct nfc_llcp_local is destroyed by local_cleanup(). The problem is that there is no synchronisation between nfc_llcp_send_ui_frame() and local_cleanup(), and skb could be put into local->tx_queue after it was purged in local_cleanup(): CPU1 CPU2 ---- ---- nfc_llcp_send_ui_frame() local_cleanup() |- do { ' |- pdu = nfc_alloc_send_skb(..., &err) | . | |- nfc_llcp_socket_release(local, false, ENXIO); | |- skb_queue_purge(&local->tx_queue); | | ' | |- skb_queue_tail(&local->tx_queue, pdu); | ... | |- pdu = nfc_alloc_send_skb(..., &err) | ^._________________________________.' local_cleanup() is called for struct nfc_llcp_local only after nfc_llcp_remove_local() unlinks it from llcp_devices. If we hold local->tx_queue.lock then, we can synchronise the thread and nfc_llcp_send_ui_frame(). Let's do that and check list_empty(&local->list) before queuing skb to local->tx_queue in nfc_llcp_send_ui_frame(). [0]: [ 56.074943][ T6096] llcp: nfc_llcp_send_ui_frame: Could not allocate PDU (error=-6) [ 64.318868][ T5813] kmemleak: 6 new suspected memory leaks (see /sys/kernel/debug/kmemleak) BUG: memory leak unreferenced object 0xffff8881272f6800 (size 1024): comm "syz.0.17", pid 6096, jiffies 4294942766 hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 27 00 03 40 00 00 00 00 00 00 00 00 00 00 00 00 '..@............ backtrace (crc da58d84d): kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] slab_post_alloc_hook mm/slub.c:4979 [inline] slab_alloc_node mm/slub.c:5284 [inline] __do_kmalloc_node mm/slub.c:5645 [inline] __kmalloc_noprof+0x3e3/0x6b0 mm/slub.c:5658 kmalloc_noprof include/linux/slab.h:961 [inline] sk_prot_alloc+0x11a/0x1b0 net/core/sock.c:2239 sk_alloc+0x36/0x360 net/core/sock.c:2295 nfc_llcp_sock_alloc+0x37/0x130 net/nfc/llcp_sock.c:979 llcp_sock_create+0x71/0xd0 net/nfc/llcp_sock.c:1044 nfc_sock_create+0xc9/0xf0 net/nfc/af_nfc.c:31 __sock_create+0x1a9/0x340 net/socket.c:1605 sock_create net/socket.c:1663 [inline] __sys_socket_create net/socket.c:1700 [inline] __sys_socket+0xb9/0x1a0 net/socket.c:1747 __do_sys_socket net/socket.c:1761 [inline] __se_sys_socket net/socket.c:1759 [inline] __x64_sys_socket+0x1b/0x30 net/socket.c:1759 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xa4/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f BUG: memory leak unreferenced object 0xffff88810fbd9800 (size 240): comm "syz.0.17", pid 6096, jiffies 4294942850 hex dump (first 32 bytes): 68 f0 ff 08 81 88 ff ff 68 f0 ff 08 81 88 ff ff h.......h....... 00 00 00 00 00 00 00 00 00 68 2f 27 81 88 ff ff .........h/'.... backtrace (crc 6cc652b1): kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] slab_post_alloc_hook mm/slub.c:4979 [inline] slab_alloc_node mm/slub.c:5284 [inline] kmem_cache_alloc_node_noprof+0x36f/0x5e0 mm/slub.c:5336 __alloc_skb+0x203/0x240 net/core/skbuff.c:660 alloc_skb include/linux/skbuff.h:1383 [inline] alloc_skb_with_frags+0x69/0x3f0 net/core/sk ---truncated---
References
Impacted products
Vendor Product Version
Linux Linux Version: 94f418a206648c9be6fd84d6681d6956b8f8b106
Version: 94f418a206648c9be6fd84d6681d6956b8f8b106
Version: 94f418a206648c9be6fd84d6681d6956b8f8b106
Version: 94f418a206648c9be6fd84d6681d6956b8f8b106
Version: 94f418a206648c9be6fd84d6681d6956b8f8b106
Version: 94f418a206648c9be6fd84d6681d6956b8f8b106
Version: 94f418a206648c9be6fd84d6681d6956b8f8b106
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/nfc/llcp_commands.c",
            "net/nfc/llcp_core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/nfc/llcp_commands.c",
            "net/nfc/llcp_core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.8"
            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.249",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.199",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.162",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.123",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.69",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.19",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.249",
                  "versionStartIncluding": "3.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.199",
                  "versionStartIncluding": "3.8",
                  "vulnerable": true
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                  "versionEndExcluding": "6.6.123",
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                },
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                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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-\u003etx_queue after it was purged in\nlocal_cleanup():\n\n  CPU1                          CPU2\n  ----                          ----\n  nfc_llcp_send_ui_frame()      local_cleanup()\n  |- do {                       \u0027\n     |- pdu = nfc_alloc_send_skb(..., \u0026err)\n     |                          .\n     |                          |- nfc_llcp_socket_release(local, false, ENXIO);\n     |                          |- skb_queue_purge(\u0026local-\u003etx_queue);      |\n     |                          \u0027                                          |\n     |- skb_queue_tail(\u0026local-\u003etx_queue, pdu);                             |\n    ...                                                                    |\n     |- pdu = nfc_alloc_send_skb(..., \u0026err)                                |\n                                       ^._________________________________.\u0027\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-\u003etx_queue.lock then, we can synchronise\nthe thread and nfc_llcp_send_ui_frame().\n\nLet\u0027s do that and check list_empty(\u0026local-\u003elist) before\nqueuing skb to local-\u003etx_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  \u0027..@............\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/\u0027....\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---"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-02-14T16:01:18.968Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23150",
    "datePublished": "2026-02-14T16:01:18.968Z",
    "dateReserved": "2026-01-13T15:37:45.976Z",
    "dateUpdated": "2026-02-14T16:01:18.968Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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