CVE-2025-38052
Estado: ModificadaAlta (7.8)—
In the Linux kernel, the following vulnerability has been resolved:
net/tipc: fix slab-use-after-free Read in tipc_aead_encrypt_done
Syzbot reported a slab-use-after-free with the following call trace:
After freed the tipc_crypto tx by delete namespace, tipc_aead_encrypt_done may still visit it in cryptd_queue_worker workqueue.
The key of reproduction is that, simd_aead_encrypt is interrupted, leading to crypto_simd_usable() return false. Thus, the cryptd_queue_worker is triggered, and the tipc_crypto tx will be visited.
Fix this by holding net reference count before encrypt.
Detalles técnicos trazas, registros y código del informe original
==================================================================
BUG: KASAN: slab-use-after-free in tipc_aead_encrypt_done+0x4bd/0x510 net/tipc/crypto.c:840
Read of size 8 at addr ffff88807a733000 by task kworker/1:0/25
Call Trace:
kasan_report+0xd9/0x110 mm/kasan/report.c:601
tipc_aead_encrypt_done+0x4bd/0x510 net/tipc/crypto.c:840
crypto_request_complete include/crypto/algapi.h:266
aead_request_complete include/crypto/internal/aead.h:85
cryptd_aead_crypt+0x3b8/0x750 crypto/cryptd.c:772
crypto_request_complete include/crypto/algapi.h:266
cryptd_queue_worker+0x131/0x200 crypto/cryptd.c:181
process_one_work+0x9fb/0x1b60 kernel/workqueue.c:3231
Allocated by task 8355:
kzalloc_noprof include/linux/slab.h:778
tipc_crypto_start+0xcc/0x9e0 net/tipc/crypto.c:1466
tipc_init_net+0x2dd/0x430 net/tipc/core.c:72
ops_init+0xb9/0x650 net/core/net_namespace.c:139
setup_net+0x435/0xb40 net/core/net_namespace.c:343
copy_net_ns+0x2f0/0x670 net/core/net_namespace.c:508
create_new_namespaces+0x3ea/0xb10 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0xc0/0x1f0 kernel/nsproxy.c:228
ksys_unshare+0x419/0x970 kernel/fork.c:3323
__do_sys_unshare kernel/fork.c:3394
Freed by task 63:
kfree+0x12a/0x3b0 mm/slub.c:4557
tipc_crypto_stop+0x23c/0x500 net/tipc/crypto.c:1539
tipc_exit_net+0x8c/0x110 net/tipc/core.c:119
ops_exit_list+0xb0/0x180 net/core/net_namespace.c:173
cleanup_net+0x5b7/0xbf0 net/core/net_namespace.c:640
process_one_work+0x9fb/0x1b60 kernel/workqueue.c:3231
I reproduce this issue by:
ip netns add ns1
ip link add veth1 type veth peer name veth2
ip link set veth1 netns ns1
ip netns exec ns1 tipc bearer enable media eth dev veth1
ip netns exec ns1 tipc node set key this_is_a_master_key master
ip netns exec ns1 tipc bearer disable media eth dev veth1
ip netns del ns1
tipc_disc_timeout
tipc_bearer_xmit_skb
tipc_crypto_xmit
tipc_aead_encrypt
crypto_aead_encrypt
// encrypt()
simd_aead_encrypt
// crypto_simd_usable() is false
child = &ctx->cryptd_tfm->base;
simd_aead_encrypt
crypto_aead_encrypt
// encrypt()
cryptd_aead_encrypt_enqueue
cryptd_aead_enqueue
cryptd_enqueue_request
// trigger cryptd_queue_worker
queue_work_on(smp_processor_id(), cryptd_wq, &cpu_queue->work)CVSS
- 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: 0.54%
- Percentil entre todas las CVEs puntuadas: 44
- 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 escalation85 % - Impacto principal
T1059Command and Scripting Interpreterexecution75 %
Vulnerabilidad de use-after-free (CWE-416) en el kernel Linux explotable localmente por usuario sin privilegios (PR:L) que causa corrupción de memoria. El atacante puede lograr ejecución de código arbitrario al manipular el flujo de trabajo criptográfico TIPC y activar el worker queue tras liberar e
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 (2)
CWE
- CWE-416
Referencias
- https://git.kernel.org/stable/c/4a0fddc2c0d5c28aec8c262ad4603be0bef1938c
- https://git.kernel.org/stable/c/689a205cd968a1572ab561b0c4c2d50a10e9d3b0
- https://git.kernel.org/stable/c/b19fc1d0be3c3397e5968fe2627f22e7f84673b1
- https://git.kernel.org/stable/c/b8fcae6d2e93c54cacb8f579a77d827c1c643eb5
- https://git.kernel.org/stable/c/d42ed4de6aba232d946d20653a70f79158a6535b
- https://git.kernel.org/stable/c/e279024617134c94fd3e37470156534d5f2b3472
- https://git.kernel.org/stable/c/f5c2c4eaaa5a8e7e0685ec031d480e588e263e59
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/tipc: fix slab-use-after-free Read in tipc_aead_encrypt_done\n\nSyzbot reported a slab-use-after-free with the following call trace:\n\n ==================================================================\n BUG: KASAN: slab-use-after-free in tipc_aead_encrypt_done+0x4bd/0x510 net/tipc/crypto.c:840\n Read of size 8 at addr ffff88807a733000 by task kworker/1:0/25\n\n Call Trace:\n kasan_report+0xd9/0x110 mm/kasan/report.c:601\n tipc_aead_encrypt_done+0x4bd/0x510 net/tipc/crypto.c:840\n crypto_request_complete include/crypto/algapi.h:266\n aead_request_complete include/crypto/internal/aead.h:85\n cryptd_aead_crypt+0x3b8/0x750 crypto/cryptd.c:772\n crypto_request_complete include/crypto/algapi.h:266\n cryptd_queue_worker+0x131/0x200 crypto/cryptd.c:181\n process_one_work+0x9fb/0x1b60 kernel/workqueue.c:3231\n\n Allocated by task 8355:\n kzalloc_noprof include/linux/slab.h:778\n tipc_crypto_start+0xcc/0x9e0 net/tipc/crypto.c:1466\n tipc_init_net+0x2dd/0x430 net/tipc/core.c:72\n ops_init+0xb9/0x650 net/core/net_namespace.c:139\n setup_net+0x435/0xb40 net/core/net_namespace.c:343\n copy_net_ns+0x2f0/0x670 net/core/net_namespace.c:508\n create_new_namespaces+0x3ea/0xb10 kernel/nsproxy.c:110\n unshare_nsproxy_namespaces+0xc0/0x1f0 kernel/nsproxy.c:228\n ksys_unshare+0x419/0x970 kernel/fork.c:3323\n __do_sys_unshare kernel/fork.c:3394\n\n Freed by task 63:\n kfree+0x12a/0x3b0 mm/slub.c:4557\n tipc_crypto_stop+0x23c/0x500 net/tipc/crypto.c:1539\n tipc_exit_net+0x8c/0x110 net/tipc/core.c:119\n ops_exit_list+0xb0/0x180 net/core/net_namespace.c:173\n cleanup_net+0x5b7/0xbf0 net/core/net_namespace.c:640\n process_one_work+0x9fb/0x1b60 kernel/workqueue.c:3231\n\nAfter freed the tipc_crypto tx by delete namespace, tipc_aead_encrypt_done\nmay still visit it in cryptd_queue_worker workqueue.\n\nI reproduce this issue by:\n ip netns add ns1\n ip link add veth1 type veth peer name veth2\n ip link set veth1 netns ns1\n ip netns exec ns1 tipc bearer enable media eth dev veth1\n ip netns exec ns1 tipc node set key this_is_a_master_key master\n ip netns exec ns1 tipc bearer disable media eth dev veth1\n ip netns del ns1\n\nThe key of reproduction is that, simd_aead_encrypt is interrupted, leading\nto crypto_simd_usable() return false. Thus, the cryptd_queue_worker is\ntriggered, and the tipc_crypto tx will be visited.\n\n tipc_disc_timeout\n tipc_bearer_xmit_skb\n tipc_crypto_xmit\n tipc_aead_encrypt\n crypto_aead_encrypt\n // encrypt()\n simd_aead_encrypt\n // crypto_simd_usable() is false\n child = &ctx->cryptd_tfm->base;\n\n simd_aead_encrypt\n crypto_aead_encrypt\n // encrypt()\n cryptd_aead_encrypt_enqueue\n cryptd_aead_enqueue\n cryptd_enqueue_request\n // trigger cryptd_queue_worker\n queue_work_on(smp_processor_id(), cryptd_wq, &cpu_queue->work)\n\nFix this by holding net reference count before encrypt."
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/tipc: corrección de lectura slab-use-after-free en tipc_aead_encrypt_done Syzbot informó de una lectura slab-use-after-free con el siguiente seguimiento de llamada: ======================================================================= ERROR: KASAN: slab-use-after-free en tipc_aead_encrypt_done+0x4bd/0x510 net/tipc/crypto.c:840 Lectura de tamaño 8 en la dirección ffff88807a733000 por la tarea kworker/1:0/25 Seguimiento de llamada: kasan_report+0xd9/0x110 mm/kasan/report.c:601 tipc_aead_encrypt_done+0x4bd/0x510 net/tipc/crypto.c:840 crypto_request_complete include/crypto/algapi.h:266 aead_request_complete include/crypto/internal/aead.h:85 cryptd_aead_crypt+0x3b8/0x750 crypto/cryptd.c:772 crypto_request_complete include/crypto/algapi.h:266 cryptd_queue_worker+0x131/0x200 crypto/cryptd.c:181 process_one_work+0x9fb/0x1b60 kernel/workqueue.c:3231 Asignado por la tarea 8355: kzalloc_noprof include/linux/slab.h:778 tipc_crypto_start+0xcc/0x9e0 net/tipc/crypto.c:1466 tipc_init_net+0x2dd/0x430 net/tipc/core.c:72 ops_init+0xb9/0x650 net/core/net_namespace.c:139 setup_net+0x435/0xb40 net/core/net_namespace.c:343 copy_net_ns+0x2f0/0x670 net/core/net_namespace.c:508 create_new_namespaces+0x3ea/0xb10 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xc0/0x1f0 kernel/nsproxy.c:228 ksys_unshare+0x419/0x970 kernel/fork.c:3323 __do_sys_unshare kernel/fork.c:3394 Liberado por la tarea 63: kfree+0x12a/0x3b0 mm/slub.c:4557 tipc_crypto_stop+0x23c/0x500 net/tipc/crypto.c:1539 tipc_exit_net+0x8c/0x110 net/tipc/core.c:119 ops_exit_list+0xb0/0x180 net/core/net_namespace.c:173 cleanup_net+0x5b7/0xbf0 net/core/net_namespace.c:640 process_one_work+0x9fb/0x1b60 kernel/workqueue.c:3231 Después de liberar la transacción tipc_crypto al eliminar el espacio de nombres, tipc_aead_encrypt_done aún puede visitarla en cryptd_queue_worker workqueue. Reproduzco este problema mediante: ip netns add ns1 ip link add veth1 type veth peer name veth2 ip link set veth1 netns ns1 ip netns exec ns1 tipc bearer enable media eth dev veth1 ip netns exec ns1 tipc node set key this_is_a_master_key master ip netns exec ns1 tipc bearer disabled media eth dev veth1 ip netns del ns1 La clave de reproducción es que simd_aead_encrypt se interrumpe, lo que lleva a que crypto_simd_usable() devuelva falso. Por lo tanto, se activa cryptd_queue_worker y se visita la transacción tipc_crypto. tipc_disc_timeout tipc_bearer_xmit_skb tipc_crypto_xmit tipc_aead_encrypt crypto_aead_encrypt // cifrar() simd_aead_encrypt // crypto_simd_usable() es falso child = &ctx->cryptd_tfm->base; simd_aead_encrypt crypto_aead_encrypt // cifrar() cryptd_aead_encrypt_enqueue cryptd_aead_enqueue cryptd_enqueue_request // desencadenador cryptd_queue_worker queue_work_on(smp_processor_id(), cryptd_wq, &cpu_queue->work) Solucione esto manteniendo el recuento de referencias de red antes de cifrar."
}
],
"lastModified": "2026-07-30T06:22:46.767",
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