CVE-2022-49017
Estado: ModificadaAlta (7.8)—
In the Linux kernel, the following vulnerability has been resolved:
tipc: re-fetch skb cb after tipc_msg_validate
As the call trace shows, the original skb was freed in tipc_msg_validate(), and dereferencing the old skb cb would cause an use-after-free crash.
This patch fixes it by re-fetching the skb cb from the new allocated skb after calling tipc_msg_validate().
Detalles técnicos trazas, registros y código del informe original
BUG: KASAN: use-after-free in tipc_crypto_rcv_complete+0x1835/0x2240 [tipc] Call Trace: <IRQ> tipc_crypto_rcv_complete+0x1835/0x2240 [tipc] tipc_crypto_rcv+0xd32/0x1ec0 [tipc] tipc_rcv+0x744/0x1150 [tipc] ... Allocated by task 47078: kmem_cache_alloc_node+0x158/0x4d0 __alloc_skb+0x1c1/0x270 tipc_buf_acquire+0x1e/0xe0 [tipc] tipc_msg_create+0x33/0x1c0 [tipc] tipc_link_build_proto_msg+0x38a/0x2100 [tipc] tipc_link_timeout+0x8b8/0xef0 [tipc] tipc_node_timeout+0x2a1/0x960 [tipc] call_timer_fn+0x2d/0x1c0 ... Freed by task 47078: tipc_msg_validate+0x7b/0x440 [tipc] tipc_crypto_rcv_complete+0x4b5/0x2240 [tipc] tipc_crypto_rcv+0xd32/0x1ec0 [tipc] tipc_rcv+0x744/0x1150 [tipc]
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: 0.64%
- Percentil entre todas las CVEs puntuadas: 49
- 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 %
Vulnerabilidad local (AV:L) sin interacción (UI:N) con privilegios requeridos (PR:L) en kernel Linux; CWE-416 (use-after-free) permitiría ejecución de código con permisos elevados desde proceso con privilegios. El texto confirma crash por dereferencia tras liberación, explotable localmente para esca
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-416
Referencias
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: re-fetch skb cb after tipc_msg_validate\n\nAs the call trace shows, the original skb was freed in tipc_msg_validate(),\nand dereferencing the old skb cb would cause an use-after-free crash.\n\n BUG: KASAN: use-after-free in tipc_crypto_rcv_complete+0x1835/0x2240 [tipc]\n Call Trace:\n <IRQ>\n tipc_crypto_rcv_complete+0x1835/0x2240 [tipc]\n tipc_crypto_rcv+0xd32/0x1ec0 [tipc]\n tipc_rcv+0x744/0x1150 [tipc]\n ...\n Allocated by task 47078:\n kmem_cache_alloc_node+0x158/0x4d0\n __alloc_skb+0x1c1/0x270\n tipc_buf_acquire+0x1e/0xe0 [tipc]\n tipc_msg_create+0x33/0x1c0 [tipc]\n tipc_link_build_proto_msg+0x38a/0x2100 [tipc]\n tipc_link_timeout+0x8b8/0xef0 [tipc]\n tipc_node_timeout+0x2a1/0x960 [tipc]\n call_timer_fn+0x2d/0x1c0\n ...\n Freed by task 47078:\n tipc_msg_validate+0x7b/0x440 [tipc]\n tipc_crypto_rcv_complete+0x4b5/0x2240 [tipc]\n tipc_crypto_rcv+0xd32/0x1ec0 [tipc]\n tipc_rcv+0x744/0x1150 [tipc]\n\nThis patch fixes it by re-fetching the skb cb from the new allocated skb\nafter calling tipc_msg_validate()."
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: tipc: volver a obtener el skb cb después de tipc_msg_validate Como muestra el seguimiento de la llamada, el skb original se liberó en tipc_msg_validate(), y desreferenciar el antiguo skb cb causaría un bloqueo por use after free. ERROR: KASAN: use after free en tipc_crypto_rcv_complete+0x1835/0x2240 [tipc] Seguimiento de llamadas: tipc_crypto_rcv_complete+0x1835/0x2240 [tipc] tipc_crypto_rcv+0xd32/0x1ec0 [tipc] tipc_rcv+0x744/0x1150 [tipc] ... Asignado por la tarea 47078: kmem_cache_alloc_node+0x158/0x4d0 __alloc_skb+0x1c1/0x270 tipc_buf_acquire+0x1e/0xe0 [tipc] tipc_msg_create+0x33/0x1c0 [tipc] tipc_link_build_proto_msg+0x38a/0x2100 [tipc] tipc_link_timeout+0x8b8/0xef0 [tipc] tipc_node_timeout+0x2a1/0x960 [tipc] call_timer_fn+0x2d/0x1c0 ... Liberado por la tarea 47078: tipc_msg_validate+0x7b/0x440 [tipc] tipc_crypto_rcv_complete+0x4b5/0x2240 [tipc] tipc_crypto_rcv+0xd32/0x1ec0 [tipc] tipc_rcv+0x744/0x1150 [tipc] Este parche lo corrige volviendo a obtener el cb skb del nuevo skb asignado después de llamar a tipc_msg_validate()."
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