CVE-2026-23072
Estado: AnalizadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
l2tp: Fix memleak in l2tp_udp_encap_recv().
syzbot reported memleak of struct l2tp_session, l2tp_tunnel, sock, etc. [0]
The cited commit moved down the validation of the protocol version in l2tp_udp_encap_recv().
The new place requires an extra error handling to avoid the memleak.
Let's call l2tp_session_put() there.
Detalles técnicos trazas, registros y código del informe original
[0]:
BUG: memory leak
unreferenced object 0xffff88810a290200 (size 512):
comm "syz.0.17", pid 6086, jiffies 4294944299
hex dump (first 32 bytes):
7d eb 04 0c 00 00 00 00 01 00 00 00 00 00 00 00 }...............
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace (crc babb6a4f):
kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
slab_post_alloc_hook mm/slub.c:4958 [inline]
slab_alloc_node mm/slub.c:5263 [inline]
__do_kmalloc_node mm/slub.c:5656 [inline]
__kmalloc_noprof+0x3e0/0x660 mm/slub.c:5669
kmalloc_noprof include/linux/slab.h:961 [inline]
kzalloc_noprof include/linux/slab.h:1094 [inline]
l2tp_session_create+0x3a/0x3b0 net/l2tp/l2tp_core.c:1778
pppol2tp_connect+0x48b/0x920 net/l2tp/l2tp_ppp.c:755
__sys_connect_file+0x7a/0xb0 net/socket.c:2089
__sys_connect+0xde/0x110 net/socket.c:2108
__do_sys_connect net/socket.c:2114 [inline]
__se_sys_connect net/socket.c:2111 [inline]
__x64_sys_connect+0x1c/0x30 net/socket.c:2111
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7fCVSS
- 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: 0.14%
- Percentil entre todas las CVEs puntuadas: 3
- Fecha de la puntuación: 6/10/2026
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
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nl2tp: Fix memleak in l2tp_udp_encap_recv().\n\nsyzbot reported memleak of struct l2tp_session, l2tp_tunnel,\nsock, etc. [0]\n\nThe cited commit moved down the validation of the protocol\nversion in l2tp_udp_encap_recv().\n\nThe new place requires an extra error handling to avoid the\nmemleak.\n\nLet's call l2tp_session_put() there.\n\n[0]:\nBUG: memory leak\nunreferenced object 0xffff88810a290200 (size 512):\n comm \"syz.0.17\", pid 6086, jiffies 4294944299\n hex dump (first 32 bytes):\n 7d eb 04 0c 00 00 00 00 01 00 00 00 00 00 00 00 }...............\n 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................\n backtrace (crc babb6a4f):\n kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]\n slab_post_alloc_hook mm/slub.c:4958 [inline]\n slab_alloc_node mm/slub.c:5263 [inline]\n __do_kmalloc_node mm/slub.c:5656 [inline]\n __kmalloc_noprof+0x3e0/0x660 mm/slub.c:5669\n kmalloc_noprof include/linux/slab.h:961 [inline]\n kzalloc_noprof include/linux/slab.h:1094 [inline]\n l2tp_session_create+0x3a/0x3b0 net/l2tp/l2tp_core.c:1778\n pppol2tp_connect+0x48b/0x920 net/l2tp/l2tp_ppp.c:755\n __sys_connect_file+0x7a/0xb0 net/socket.c:2089\n __sys_connect+0xde/0x110 net/socket.c:2108\n __do_sys_connect net/socket.c:2114 [inline]\n __se_sys_connect net/socket.c:2111 [inline]\n __x64_sys_connect+0x1c/0x30 net/socket.c:2111\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f"
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"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nl2tp: Solucionar fuga de memoria en l2tp_udp_encap_recv().\n\nsyzbot informó una fuga de memoria de struct l2tp_session, l2tp_tunnel, sock, etc. [0]\n\nEl commit citado movió hacia abajo la validación de la versión del protocolo en l2tp_udp_encap_recv().\n\nEl nuevo lugar requiere un manejo de errores adicional para evitar la fuga de memoria.\n\nLlamemos a l2tp_session_put() allí.\n\n[0]:\nERROR: fuga de memoria\nobjeto sin referencia 0xffff88810a290200 (tamaño 512):\n comm 'syz.0.17', pid 6086, jiffies 4294944299\n volcado hexadecimal (primeros 32 bytes):\n 7d eb 04 0c 00 00 00 00 01 00 00 00 00 00 00 00 }...............\n 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................\n rastreo de pila (crc babb6a4f):\n kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]\n slab_post_alloc_hook mm/slub.c:4958 [inline]\n slab_alloc_node mm/slub.c:5263 [inline]\n __do_kmalloc_node mm/slub.c:5656 [inline]\n __kmalloc_noprof+0x3e0/0x660 mm/slub.c:5669\n kmalloc_noprof include/linux/slab.h:961 [inline]\n kzalloc_noprof include/linux/slab.h:1094 [inline]\n l2tp_session_create+0x3a/0x3b0 net/l2tp/l2tp_core.c:1778\n pppol2tp_connect+0x48b/0x920 net/l2tp/l2tp_ppp.c:755\n __sys_connect_file+0x7a/0xb0 net/socket.c:2089\n __sys_connect+0xde/0x110 net/socket.c:2108\n __do_sys_connect net/socket.c:2114 [inline]\n __se_sys_connect net/socket.c:2111 [inline]\n __x64_sys_connect+0x1c/0x30 net/socket.c:2111\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f"
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"lastModified": "2026-06-17T10:20:48.840",
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