CVE-2026-23150
Estado: AnalizadaMedia (5.5)—
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():
Leer descripción completaMostrar menos
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().
Detalles técnicos trazas, registros y código del informe original
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) |
^._________________________________.'
[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---CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.12%
- Percentil entre todas las CVEs puntuadas: 2
- Fecha de la puntuación: 5/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
CWE
- CWE-401
Referencias
- https://git.kernel.org/stable/c/165c34fb6068ff153e3fc99a932a80a9d5755709
- https://git.kernel.org/stable/c/3098e5c8af0f4c8f7eebbb370798df8aa2e12ba5
- https://git.kernel.org/stable/c/61858cbce6ca4bef9ed116c689a4be9520841339
- https://git.kernel.org/stable/c/65e976e1f474ae3bf5681d7abafb8f3fdb34b8cc
- https://git.kernel.org/stable/c/6734ff1ac6beba1d0c22dc9a3dc1849b773b511f
- https://git.kernel.org/stable/c/ab660cb8e17aa93426d1e821c2cce60e4b9bc56a
- https://git.kernel.org/stable/c/f8d002626d434f5fea9085e2557711c16a15cec6
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-23150",
"cveTags": [],
"metrics": {
"cvssMetricV31": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 5.5,
"attackVector": "LOCAL",
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"integrityImpact": "NONE",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "LOW",
"confidentialityImpact": "NONE"
},
"impactScore": 3.6,
"exploitabilityScore": 1.8
}
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{
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},
{
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}
],
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"net/nfc/llcp_core.c"
],
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}
]
}
],
"published": "2026-02-14T16:15:55.123",
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"tags": [
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],
"vulnStatus": "Analyzed",
"weaknesses": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"description": [
{
"lang": "en",
"value": "CWE-401"
}
]
}
],
"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---"
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnfc: llcp: Corrección de fuga de memoria en nfc_llcp_send_ui_frame().\n\nsyzbot informó de varias fugas de memoria relacionadas con NFC, struct\nnfc_llcp_sock, sk_buff, nfc_dev, etc. [0]\n\nEl registro principal sugirió que nfc_llcp_send_ui_frame() falló\nal asignar skb debido a que sock_error(sk) era -ENXIO.\n\nENXIO es establecido por nfc_llcp_socket_release() cuando struct\nnfc_llcp_local es destruido por local_cleanup().\n\nEl problema es que no hay sincronización entre\nnfc_llcp_send_ui_frame() y local_cleanup(), y skb\npodría ser puesto en local->tx_queue después de que fuera purgado en\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() es llamado para struct nfc_llcp_local solo\ndespués de que nfc_llcp_remove_local() lo desvincula de llcp_devices.\n\nSi mantenemos local->tx_queue.lock entonces, podemos sincronizar\nel hilo y nfc_llcp_send_ui_frame().\n\nHagamos eso y verifiquemos list_empty(&local->list) antes\nde encolar skb en local->tx_queue en 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---tru"
}
],
"lastModified": "2026-06-17T10:20:59.510",
"configurations": [
{
"nodes": [
{
"negate": false,
"cpeMatch": [
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