CVE-2026-22977
Estado: ModificadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
net: sock: fix hardened usercopy panic in sock_recv_errqueue
skbuff_fclone_cache was created without defining a usercopy region, [1] unlike skbuff_head_cache which properly whitelists the cb[] field. [2] This causes a usercopy BUG() when CONFIG_HARDENED_USERCOPY is enabled and the kernel attempts to copy sk_buff.cb data to userspace via sock_recv_errqueue() -> put_cmsg().
The crash occurs when: 1. TCP allocates an skb using alloc_skb_fclone() (from skbuff_fclone_cache) [1] 2. The skb is cloned via skb_clone() using the pre-allocated fclone [3] 3.
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The cloned skb is queued to sk_error_queue for timestamp reporting 4. Userspace reads the error queue via recvmsg(MSG_ERRQUEUE) 5. sock_recv_errqueue() calls put_cmsg() to copy serr->ee from skb->cb [4] 6. __check_heap_object() fails because skbuff_fclone_cache has no usercopy whitelist [5]
When cloned skbs allocated from skbuff_fclone_cache are used in the socket error queue, accessing the sock_exterr_skb structure in skb->cb via put_cmsg() triggers a usercopy hardening violation:
This patch uses a local stack variable as a bounce buffer to avoid the hardened usercopy check failure.
[1] https://elixir.bootlin.com/linux/v6.12.62/source/net/ipv4/tcp.c#L885 [2] https://elixir.bootlin.com/linux/v6.12.62/source/net/core/skbuff.c#L5104 [3] https://elixir.bootlin.com/linux/v6.12.62/source/net/core/skbuff.c#L5566 [4] https://elixir.bootlin.com/linux/v6.12.62/source/net/core/skbuff.c#L5491 [5] https://elixir.bootlin.com/linux/v6.12.62/source/mm/slub.c#L5719
Detalles técnicos trazas, registros y código del informe original
[ 5.379589] usercopy: Kernel memory exposure attempt detected from SLUB object 'skbuff_fclone_cache' (offset 296, size 16)! [ 5.382796] kernel BUG at mm/usercopy.c:102! [ 5.383923] Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI [ 5.384903] CPU: 1 UID: 0 PID: 138 Comm: poc_put_cmsg Not tainted 6.12.57 #7 [ 5.384903] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 5.384903] RIP: 0010:usercopy_abort+0x6c/0x80 [ 5.384903] Code: 1a 86 51 48 c7 c2 40 15 1a 86 41 52 48 c7 c7 c0 15 1a 86 48 0f 45 d6 48 c7 c6 80 15 1a 86 48 89 c1 49 0f 45 f3 e8 84 27 88 ff <0f> 0b 490 [ 5.384903] RSP: 0018:ffffc900006f77a8 EFLAGS: 00010246 [ 5.384903] RAX: 000000000000006f RBX: ffff88800f0ad2a8 RCX: 1ffffffff0f72e74 [ 5.384903] RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffff87b973a0 [ 5.384903] RBP: 0000000000000010 R08: 0000000000000000 R09: fffffbfff0f72e74 [ 5.384903] R10: 0000000000000003 R11: 79706f6372657375 R12: 0000000000000001 [ 5.384903] R13: ffff88800f0ad2b8 R14: ffffea00003c2b40 R15: ffffea00003c2b00 [ 5.384903] FS: 0000000011bc4380(0000) GS:ffff8880bf100000(0000) knlGS:0000000000000000 [ 5.384903] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 5.384903] CR2: 000056aa3b8e5fe4 CR3: 000000000ea26004 CR4: 0000000000770ef0 [ 5.384903] PKRU: 55555554 [ 5.384903] Call Trace: [ 5.384903] <TASK> [ 5.384903] __check_heap_object+0x9a/0xd0 [ 5.384903] __check_object_size+0x46c/0x690 [ 5.384903] put_cmsg+0x129/0x5e0 [ 5.384903] sock_recv_errqueue+0x22f/0x380 [ 5.384903] tls_sw_recvmsg+0x7ed/0x1960 [ 5.384903] ? srso_alias_return_thunk+0x5/0xfbef5 [ 5.384903] ? schedule+0x6d/0x270 [ 5.384903] ? srso_alias_return_thunk+0x5/0xfbef5 [ 5.384903] ? mutex_unlock+0x81/0xd0 [ 5.384903] ? __pfx_mutex_unlock+0x10/0x10 [ 5.384903] ? __pfx_tls_sw_recvmsg+0x10/0x10 [ 5.384903] ? _raw_spin_lock_irqsave+0x8f/0xf0 [ 5.384903] ? _raw_read_unlock_irqrestore+0x20/0x40 [ 5.384903] ? srso_alias_return_thunk+0x5/0xfbef5 The crash offset 296 corresponds to skb2->cb within skbuff_fclones: - sizeof(struct sk_buff) = 232 - offsetof(struct sk_buff, cb) = 40 - offset of skb2.cb in fclones = 232 + 40 = 272 - crash offset 296 = 272 + 24 (inside sock_exterr_skb.ee)
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: 0.14%
- Percentil entre todas las CVEs puntuadas: 3
- 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-476
Referencias
- https://git.kernel.org/stable/c/005671c60fcf1dbdb8bddf12a62568fd5e4ec391
- https://git.kernel.org/stable/c/2a71a1a8d0ed718b1c7a9ac61f07e5755c47ae20
- https://git.kernel.org/stable/c/582a5e922a9652fcbb7d0165c95d5b20aa37575d
- https://git.kernel.org/stable/c/88dd6be7ebb3153b662c2cebcb06e032a92857f5
- https://git.kernel.org/stable/c/8c6901aa29626e35045130bac09b75f791acca85
- https://git.kernel.org/stable/c/c655d2167bf014d4c61b4faeca59b60ff9b9f6b1
- https://git.kernel.org/stable/c/e00b169eaac5f7cdbf710c354c8fa76d02009115
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-253495.html
JSON original (NVD)
Mostrar
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"published": "2026-01-21T14:16:06.853",
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"vulnStatus": "Modified",
"weaknesses": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"description": [
{
"lang": "en",
"value": "CWE-476"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: sock: fix hardened usercopy panic in sock_recv_errqueue\n\nskbuff_fclone_cache was created without defining a usercopy region,\n[1] unlike skbuff_head_cache which properly whitelists the cb[] field.\n[2] This causes a usercopy BUG() when CONFIG_HARDENED_USERCOPY is\nenabled and the kernel attempts to copy sk_buff.cb data to userspace\nvia sock_recv_errqueue() -> put_cmsg().\n\nThe crash occurs when: 1. TCP allocates an skb using alloc_skb_fclone()\n (from skbuff_fclone_cache) [1]\n2. The skb is cloned via skb_clone() using the pre-allocated fclone\n[3] 3. The cloned skb is queued to sk_error_queue for timestamp\nreporting 4. Userspace reads the error queue via recvmsg(MSG_ERRQUEUE)\n5. sock_recv_errqueue() calls put_cmsg() to copy serr->ee from skb->cb\n[4] 6. __check_heap_object() fails because skbuff_fclone_cache has no\n usercopy whitelist [5]\n\nWhen cloned skbs allocated from skbuff_fclone_cache are used in the\nsocket error queue, accessing the sock_exterr_skb structure in skb->cb\nvia put_cmsg() triggers a usercopy hardening violation:\n\n[ 5.379589] usercopy: Kernel memory exposure attempt detected from SLUB object 'skbuff_fclone_cache' (offset 296, size 16)!\n[ 5.382796] kernel BUG at mm/usercopy.c:102!\n[ 5.383923] Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI\n[ 5.384903] CPU: 1 UID: 0 PID: 138 Comm: poc_put_cmsg Not tainted 6.12.57 #7\n[ 5.384903] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014\n[ 5.384903] RIP: 0010:usercopy_abort+0x6c/0x80\n[ 5.384903] Code: 1a 86 51 48 c7 c2 40 15 1a 86 41 52 48 c7 c7 c0 15 1a 86 48 0f 45 d6 48 c7 c6 80 15 1a 86 48 89 c1 49 0f 45 f3 e8 84 27 88 ff <0f> 0b 490\n[ 5.384903] RSP: 0018:ffffc900006f77a8 EFLAGS: 00010246\n[ 5.384903] RAX: 000000000000006f RBX: ffff88800f0ad2a8 RCX: 1ffffffff0f72e74\n[ 5.384903] RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffff87b973a0\n[ 5.384903] RBP: 0000000000000010 R08: 0000000000000000 R09: fffffbfff0f72e74\n[ 5.384903] R10: 0000000000000003 R11: 79706f6372657375 R12: 0000000000000001\n[ 5.384903] R13: ffff88800f0ad2b8 R14: ffffea00003c2b40 R15: ffffea00003c2b00\n[ 5.384903] FS: 0000000011bc4380(0000) GS:ffff8880bf100000(0000) knlGS:0000000000000000\n[ 5.384903] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ 5.384903] CR2: 000056aa3b8e5fe4 CR3: 000000000ea26004 CR4: 0000000000770ef0\n[ 5.384903] PKRU: 55555554\n[ 5.384903] Call Trace:\n[ 5.384903] <TASK>\n[ 5.384903] __check_heap_object+0x9a/0xd0\n[ 5.384903] __check_object_size+0x46c/0x690\n[ 5.384903] put_cmsg+0x129/0x5e0\n[ 5.384903] sock_recv_errqueue+0x22f/0x380\n[ 5.384903] tls_sw_recvmsg+0x7ed/0x1960\n[ 5.384903] ? srso_alias_return_thunk+0x5/0xfbef5\n[ 5.384903] ? schedule+0x6d/0x270\n[ 5.384903] ? srso_alias_return_thunk+0x5/0xfbef5\n[ 5.384903] ? mutex_unlock+0x81/0xd0\n[ 5.384903] ? __pfx_mutex_unlock+0x10/0x10\n[ 5.384903] ? __pfx_tls_sw_recvmsg+0x10/0x10\n[ 5.384903] ? _raw_spin_lock_irqsave+0x8f/0xf0\n[ 5.384903] ? _raw_read_unlock_irqrestore+0x20/0x40\n[ 5.384903] ? srso_alias_return_thunk+0x5/0xfbef5\n\nThe crash offset 296 corresponds to skb2->cb within skbuff_fclones:\n - sizeof(struct sk_buff) = 232 - offsetof(struct sk_buff, cb) = 40 -\n offset of skb2.cb in fclones = 232 + 40 = 272 - crash offset 296 =\n 272 + 24 (inside sock_exterr_skb.ee)\n\nThis patch uses a local stack variable as a bounce buffer to avoid the hardened usercopy check failure.\n\n[1] https://elixir.bootlin.com/linux/v6.12.62/source/net/ipv4/tcp.c#L885\n[2] https://elixir.bootlin.com/linux/v6.12.62/source/net/core/skbuff.c#L5104\n[3] https://elixir.bootlin.com/linux/v6.12.62/source/net/core/skbuff.c#L5566\n[4] https://elixir.bootlin.com/linux/v6.12.62/source/net/core/skbuff.c#L5491\n[5] https://elixir.bootlin.com/linux/v6.12.62/source/mm/slub.c#L5719"
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet: sock: soluciona el pánico de usercopy endurecido en sock_recv_errqueue\n\nskbuff_fclone_cache fue creada sin definir una región de usercopy,\n[1] a diferencia de skbuff_head_cache que incluye correctamente en la lista blanca el campo cb[].\n[2] Esto causa un BUG() de usercopy cuando CONFIG_HARDENED_USERCOPY está\nhabilitado y el kernel intenta copiar datos de sk_buff.cb al espacio de usuario\na través de sock_recv_errqueue() -> put_cmsg().\n\nEl fallo ocurre cuando: 1. TCP asigna un skb usando alloc_skb_fclone()\n (de skbuff_fclone_cache) [1]\n2. El skb es clonado a través de skb_clone() usando el fclone preasignado\n[3] 3. El skb clonado se encola en sk_error_queue para el reporte de marca de tiempo\n4. El espacio de usuario lee la cola de errores a través de recvmsg(MSG_ERRQUEUE)\n5. sock_recv_errqueue() llama a put_cmsg() para copiar serr->ee de skb->cb\n[4] 6. __check_heap_object() falla porque skbuff_fclone_cache no tiene una\n lista blanca de usercopy [5]\n\nCuando los skbs clonados asignados de skbuff_fclone_cache se usan en la\ncola de errores del socket, acceder a la estructura sock_exterr_skb en skb->cb\na través de put_cmsg() desencadena una violación de endurecimiento de usercopy:\n\n[ 5.379589] usercopy: Intento de exposición de memoria del kernel detectado desde el objeto SLUB 'skbuff_fclone_cache' (desplazamiento 296, tamaño 16)!\n[ 5.382796] kernel BUG at mm/usercopy.c:102!\n[ 5.383923] Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI\n[ 5.384903] CPU: 1 UID: 0 PID: 138 Comm: poc_put_cmsg Not tainted 6.12.57 #7\n[ 5.384903] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014\n[ 5.384903] RIP: 0010:usercopy_abort+0x6c/0x80\n[ 5.384903] Code: 1a 86 51 48 c7 c2 40 15 1a 86 41 52 48 c7 c7 c0 15 1a 86 48 0f 45 d6 48 c7 c6 80 15 1a 86 48 89 c1 49 0f 45 f3 e8 84 27 88 ff <0f> 0b 490\n[ 5.384903] RSP: 0018:ffffc900006f77a8 EFLAGS: 00010246\n[ 5.384903] RAX: 000000000000006f RBX: ffff88800f0ad2a8 RCX: 1ffffffff0f72e74\n[ 5.384903] RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffff87b973a0\n[ 5.384903] RBP: 0000000000000010 R08: 0000000000000000 R09: fffffbfff0f72e74\n[ 5.384903] R10: 0000000000000003 R11: 79706f6372657375 R12: 0000000000000001\n[ 5.384903] R13: ffff88800f0ad2b8 R14: ffffea00003c2b40 R15: ffffea00003c2b00\n[ 5.384903] FS: 0000000011bc4380(0000) GS:ffff8880bf100000(0000) knlGS:0000000000000000\n[ 5.384903] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ 5.384903] CR2: 000056aa3b8e5fe4 CR3: 000000000ea26004 CR4: 0000000000770ef0\n[ 5.384903] PKRU: 55555554\n[ 5.384903] Call Trace:\n[ 5.384903] \n[ 5.384903] __check_heap_object+0x9a/0xd0\n[ 5.384903] __check_object_size+0x46c/0x690\n[ 5.384903] put_cmsg+0x129/0x5e0\n[ 5.384903] sock_recv_errqueue+0x22f/0x380\n[ 5.384903] tls_sw_recvmsg+0x7ed/0x1960\n[ 5.384903] ? srso_alias_return_thunk+0x5/0xfbef5\n[ 5.384903] ? schedule+0x6d/0x270\n[ 5.384903] ? srso_alias_return_thunk+0x5/0xfbef5\n[ 5.384903] ? mutex_unlock+0x81/0xd0\n[ 5.384903] ? __pfx_mutex_unlock+0x10/0x10\n[ 5.384903] ? __pfx_tls_sw_recvmsg+0x10/0x10\n[ 5.384903] ? _raw_spin_lock_irqsave+0x8f/0xf0\n[ 5.384903] ? _raw_read_unlock_irqrestore+0x20/0x40\n[ 5.384903] ? srso_alias_return_thunk+0x5/0xfbef5\n\nEl desplazamiento de fallo 296 corresponde a skb2->cb dentro de skbuff_fclones:\n - sizeof(struct sk_buff) = 232 - offsetof(struct sk_buff, cb) = 40 -\n desplazamiento de skb2.cb en fclones = 232 + 40 = 272 - desplazamiento de fallo 296 =\n 272 + 24 (dentro de sock_exterr_skb.ee)\n\nEste parche utiliza una variable de pila local como un búfer de rebote para evitar el fallo de la comprobación de usercopy endurecido.\n\n[1] https://elixir.bootlin.com/linux/v6.12.62/source/net/ipv4/tcp.c#L885\n[2] https://elixir.bootlin.com/linux/v6.12.62/source/net/core/skbuff.c#L5104"
}
],
"lastModified": "2026-07-14T13:18:20.810",
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