CVE-2024-50151
Estado: ModificadaAlta (7.8)—
In the Linux kernel, the following vulnerability has been resolved:
smb: client: fix OOBs when building SMB2_IOCTL request
When using encryption, either enforced by the server or when using 'seal' mount option, the client will squash all compound request buffers down for encryption into a single iov in smb2_set_next_command().
SMB2_ioctl_init() allocates a small buffer (448 bytes) to hold the SMB2_IOCTL request in the first iov, and if the user passes an input buffer that is greater than 328 bytes, smb2_set_next_command() will end up writing off the end of @rqst->iov[0].iov_base as shown below:
Detalles técnicos trazas, registros y código del informe original
mount.cifs //srv/share /mnt -o ...,seal
ln -s $(perl -e "print('a')for 1..1024") /mnt/link
BUG: KASAN: slab-out-of-bounds in
smb2_set_next_command.cold+0x1d6/0x24c [cifs]
Write of size 4116 at addr ffff8881148fcab8 by task ln/859
CPU: 1 UID: 0 PID: 859 Comm: ln Not tainted 6.12.0-rc3 #1
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS
1.16.3-2.fc40 04/01/2014
Call Trace:
<TASK>
dump_stack_lvl+0x5d/0x80
? smb2_set_next_command.cold+0x1d6/0x24c [cifs]
print_report+0x156/0x4d9
? smb2_set_next_command.cold+0x1d6/0x24c [cifs]
? __virt_addr_valid+0x145/0x310
? __phys_addr+0x46/0x90
? smb2_set_next_command.cold+0x1d6/0x24c [cifs]
kasan_report+0xda/0x110
? smb2_set_next_command.cold+0x1d6/0x24c [cifs]
kasan_check_range+0x10f/0x1f0
__asan_memcpy+0x3c/0x60
smb2_set_next_command.cold+0x1d6/0x24c [cifs]
smb2_compound_op+0x238c/0x3840 [cifs]
? kasan_save_track+0x14/0x30
? kasan_save_free_info+0x3b/0x70
? vfs_symlink+0x1a1/0x2c0
? do_symlinkat+0x108/0x1c0
? __pfx_smb2_compound_op+0x10/0x10 [cifs]
? kmem_cache_free+0x118/0x3e0
? cifs_get_writable_path+0xeb/0x1a0 [cifs]
smb2_get_reparse_inode+0x423/0x540 [cifs]
? __pfx_smb2_get_reparse_inode+0x10/0x10 [cifs]
? rcu_is_watching+0x20/0x50
? __kmalloc_noprof+0x37c/0x480
? smb2_create_reparse_symlink+0x257/0x490 [cifs]
? smb2_create_reparse_symlink+0x38f/0x490 [cifs]
smb2_create_reparse_symlink+0x38f/0x490 [cifs]
? __pfx_smb2_create_reparse_symlink+0x10/0x10 [cifs]
? find_held_lock+0x8a/0xa0
? hlock_class+0x32/0xb0
? __build_path_from_dentry_optional_prefix+0x19d/0x2e0 [cifs]
cifs_symlink+0x24f/0x960 [cifs]
? __pfx_make_vfsuid+0x10/0x10
? __pfx_cifs_symlink+0x10/0x10 [cifs]
? make_vfsgid+0x6b/0xc0
? generic_permission+0x96/0x2d0
vfs_symlink+0x1a1/0x2c0
do_symlinkat+0x108/0x1c0
? __pfx_do_symlinkat+0x10/0x10
? strncpy_from_user+0xaa/0x160
__x64_sys_symlinkat+0xb9/0xf0
do_syscall_64+0xbb/0x1d0
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f08d75c13bbCVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Puntuación base: 7.8
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.28%
- Percentil entre todas las CVEs puntuadas: 19
- 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).
🎯 Técnicas ATT&CK
Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
- Explotación
T1068Exploitation for Privilege Escalationprivilege escalation90 % - Impacto principal
T1059Command and Scripting Interpreterexecution85 %
Vulnerabilidad de buffer overflow (CWE-787) en kernel Linux con acceso local sin interacción (AV:L, PR:L, UI:N). Permite ejecutar código arbitrario con privilegios elevados mediante petición SMB2_IOCTL malformada.
Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas
Tecnologías afectadas (1)
CWE
- CWE-787
- CWE-787
Referencias
- https://git.kernel.org/stable/c/1ab60323c5201bef25f2a3dc0ccc404d9aca77f1
- https://git.kernel.org/stable/c/2ef632bfb888d1a14f81c1703817951e0bec5531
- https://git.kernel.org/stable/c/6f0516ef1290da24b85461ed08a0938af7415e49
- https://git.kernel.org/stable/c/b209c3a0bc3ac172265c7fa8309e5d00654f2510
- https://git.kernel.org/stable/c/e07d05b7f5ad9a503d9cab0afde2ab867bb65470
- https://git.kernel.org/stable/c/ed31aba8ce93472d9e16f5cff844ae7c94e9601d
- https://git.kernel.org/stable/c/fe92ddc1c32d4474e605e3a31a4afcd0e7d765ec
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
- https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html
JSON original (NVD)
Mostrar
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{
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"affectedData": [
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"tags": [
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},
{
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"source": "af854a3a-2127-422b-91ae-364da2661108"
},
{
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"source": "af854a3a-2127-422b-91ae-364da2661108"
},
{
"url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html",
"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"
}
],
"vulnStatus": "Modified",
"weaknesses": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"description": [
{
"lang": "en",
"value": "CWE-787"
}
]
},
{
"type": "Secondary",
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"description": [
{
"lang": "en",
"value": "CWE-787"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix OOBs when building SMB2_IOCTL request\n\nWhen using encryption, either enforced by the server or when using\n'seal' mount option, the client will squash all compound request buffers\ndown for encryption into a single iov in smb2_set_next_command().\n\nSMB2_ioctl_init() allocates a small buffer (448 bytes) to hold the\nSMB2_IOCTL request in the first iov, and if the user passes an input\nbuffer that is greater than 328 bytes, smb2_set_next_command() will\nend up writing off the end of @rqst->iov[0].iov_base as shown below:\n\n mount.cifs //srv/share /mnt -o ...,seal\n ln -s $(perl -e \"print('a')for 1..1024\") /mnt/link\n\n BUG: KASAN: slab-out-of-bounds in\n smb2_set_next_command.cold+0x1d6/0x24c [cifs]\n Write of size 4116 at addr ffff8881148fcab8 by task ln/859\n\n CPU: 1 UID: 0 PID: 859 Comm: ln Not tainted 6.12.0-rc3 #1\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS\n 1.16.3-2.fc40 04/01/2014\n Call Trace:\n <TASK>\n dump_stack_lvl+0x5d/0x80\n ? smb2_set_next_command.cold+0x1d6/0x24c [cifs]\n print_report+0x156/0x4d9\n ? smb2_set_next_command.cold+0x1d6/0x24c [cifs]\n ? __virt_addr_valid+0x145/0x310\n ? __phys_addr+0x46/0x90\n ? smb2_set_next_command.cold+0x1d6/0x24c [cifs]\n kasan_report+0xda/0x110\n ? smb2_set_next_command.cold+0x1d6/0x24c [cifs]\n kasan_check_range+0x10f/0x1f0\n __asan_memcpy+0x3c/0x60\n smb2_set_next_command.cold+0x1d6/0x24c [cifs]\n smb2_compound_op+0x238c/0x3840 [cifs]\n ? kasan_save_track+0x14/0x30\n ? kasan_save_free_info+0x3b/0x70\n ? vfs_symlink+0x1a1/0x2c0\n ? do_symlinkat+0x108/0x1c0\n ? __pfx_smb2_compound_op+0x10/0x10 [cifs]\n ? kmem_cache_free+0x118/0x3e0\n ? cifs_get_writable_path+0xeb/0x1a0 [cifs]\n smb2_get_reparse_inode+0x423/0x540 [cifs]\n ? __pfx_smb2_get_reparse_inode+0x10/0x10 [cifs]\n ? rcu_is_watching+0x20/0x50\n ? __kmalloc_noprof+0x37c/0x480\n ? smb2_create_reparse_symlink+0x257/0x490 [cifs]\n ? smb2_create_reparse_symlink+0x38f/0x490 [cifs]\n smb2_create_reparse_symlink+0x38f/0x490 [cifs]\n ? __pfx_smb2_create_reparse_symlink+0x10/0x10 [cifs]\n ? find_held_lock+0x8a/0xa0\n ? hlock_class+0x32/0xb0\n ? __build_path_from_dentry_optional_prefix+0x19d/0x2e0 [cifs]\n cifs_symlink+0x24f/0x960 [cifs]\n ? __pfx_make_vfsuid+0x10/0x10\n ? __pfx_cifs_symlink+0x10/0x10 [cifs]\n ? make_vfsgid+0x6b/0xc0\n ? generic_permission+0x96/0x2d0\n vfs_symlink+0x1a1/0x2c0\n do_symlinkat+0x108/0x1c0\n ? __pfx_do_symlinkat+0x10/0x10\n ? strncpy_from_user+0xaa/0x160\n __x64_sys_symlinkat+0xb9/0xf0\n do_syscall_64+0xbb/0x1d0\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n RIP: 0033:0x7f08d75c13bb"
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: smb: cliente: corregir OOB al crear una solicitud SMB2_IOCTL Al usar cifrado, ya sea aplicado por el servidor o al usar la opción de montaje 'seal', el cliente comprimirá todos los buffers de solicitud compuestos para el cifrado en un solo iov en smb2_set_next_command(). SMB2_ioctl_init() asigna un pequeño búfer (448 bytes) para contener la solicitud SMB2_IOCTL en el primer iov, y si el usuario pasa un búfer de entrada que es mayor a 328 bytes, smb2_set_next_command() terminará escribiendo el final de @rqst->iov[0].iov_base como se muestra a continuación: mount.cifs //srv/share /mnt -o ...,seal ln -s $(perl -e \"print('a')for 1..1024\") /mnt/link ERROR: KASAN: slab-out-of-bounds en smb2_set_next_command.cold+0x1d6/0x24c [cifs] Escritura de tamaño 4116 en la dirección ffff8881148fcab8 por tarea ln/859 CPU: 1 UID: 0 PID: 859 Comm: ln No contaminado 6.12.0-rc3 #1 Nombre del hardware: PC estándar QEMU (Q35 + ICH9, 2009), BIOS 1.16.3-2.fc40 01/04/2014 Seguimiento de llamadas: dump_stack_lvl+0x5d/0x80 ? smb2_set_next_command.cold+0x1d6/0x24c [cifs] print_report+0x156/0x4d9 ? smb2_set_next_command.cold+0x1d6/0x24c [cifs] ? __virt_addr_valid+0x145/0x310 ? __phys_addr+0x46/0x90 ? vfs_symlink+0x1a1/0x2c0 ? __pfx_smb2_compound_op+0x10/0x10 [cifs] ? kmem_cache_free+0x118/0x3e0 ? cifs_get_writable_path+0xeb/0x1a0 [cifs] ? smb2_get_reparse_inode+0x423/0x540 [cifs] ? __pfx_smb2_get_reparse_inode+0x10/0x10 [cifs] ? rcu_is_watching+0x20/0x50 ? __kmalloc_noprof+0x37c/0x480 ? smb2_create_reparse_symlink+0x257/0x490 [cifs] ? __pfx_smb2_create_reparse_symlink+0x10/0x10 [cifs] ? __pfx_smb2_create_reparse_symlink+0x10/0x10 [cifs] ? __buscar_bloqueo_mantenido+0x8a/0xa0 ? __hlock_class+0x32/0xb0 ? __ruta_de_compilación_desde_dentry_prefijo_opcional+0x19d/0x2e0 [cifs] ? __pfx_make_vfsuid+0x10/0x10 ? __pfx_cifs_symlink+0x10/0x10 [cifs] ? make_vfsgid+0x6b/0xc0 ? permiso_genérico+0x96/0x2d0 vfs_symlink+0x1a1/0x2c0 do_symlinkat+0x108/0x1c0 ? __pfx_do_symlinkat+0x10/0x10 ? strncpy_from_user+0xaa/0x160 __x64_sys_symlinkat+0xb9/0xf0 do_syscall_64+0xbb/0x1d0 entrada_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f08d75c13bb"
}
],
"lastModified": "2026-06-17T08:03:43.410",
"configurations": [
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
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"matchCriteriaId": "624D9A7E-BE56-498C-AB49-4DF81EB85011",
"versionEndExcluding": "5.4.285",
"versionStartIncluding": "5.0"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"matchCriteriaId": "1A03CABE-9B43-4E7F-951F-10DEEADAA426",
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"versionStartIncluding": "5.5"
},
{
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"vulnerable": true,
"matchCriteriaId": "A9BA1C73-2D2E-45E3-937B-276A28AEB5FC",
"versionEndExcluding": "5.15.170",
"versionStartIncluding": "5.11"
},
{
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