CVE-2022-50243
Estado: ModificadaAlta (7.8)—
In the Linux kernel, the following vulnerability has been resolved:
sctp: handle the error returned from sctp_auth_asoc_init_active_key
When it returns an error from sctp_auth_asoc_init_active_key(), the active_key is actually not updated. The old sh_key will be freeed while it's still used as active key in asoc. Then an use-after-free will be triggered when sending patckets, as found by syzbot:
This patch is to fix it by not replacing the sh_key when it returns errors from sctp_auth_asoc_init_active_key() in sctp_auth_set_key(). For sctp_auth_set_active_key(), old active_key_id will be set back to asoc->active_key_id when the same thing happens.
Detalles técnicos trazas, registros y código del informe original
sctp_auth_shkey_hold+0x22/0xa0 net/sctp/auth.c:112 sctp_set_owner_w net/sctp/socket.c:132 [inline] sctp_sendmsg_to_asoc+0xbd5/0x1a20 net/sctp/socket.c:1863 sctp_sendmsg+0x1053/0x1d50 net/sctp/socket.c:2025 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:819 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:734
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: 0.16%
- Percentil entre todas las CVEs puntuadas: 5
- 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 use-after-free (CWE-416) en kernel Linux con acceso local (AV:L) y privilegios (PR:L) sin interacción del usuario. Permite ejecución de código al manipular la clave de autenticación SCTP, escalando privilegios locales.
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
- https://git.kernel.org/stable/c/022152aaebe116a25c39818a07e175a8cd3c1e11
- https://git.kernel.org/stable/c/0f90099d18e3abdc01babf686f41f63fe04939c1
- https://git.kernel.org/stable/c/19d636b663e0e92951bba5fced929ca7fd25c552
- https://git.kernel.org/stable/c/382ff44716603a54f5fd238ddec6a2468e217612
- https://git.kernel.org/stable/c/3b0fcf5e29c0940e1169ce9c44f73edd98bdf12d
- https://git.kernel.org/stable/c/b8fa99a3a11bdd77fef6b4a97f1021eb30b5ba40
- https://git.kernel.org/stable/c/f65955340e0044f5c41ac799a01698ac7dee8a4e
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: handle the error returned from sctp_auth_asoc_init_active_key\n\nWhen it returns an error from sctp_auth_asoc_init_active_key(), the\nactive_key is actually not updated. The old sh_key will be freeed\nwhile it's still used as active key in asoc. Then an use-after-free\nwill be triggered when sending patckets, as found by syzbot:\n\n sctp_auth_shkey_hold+0x22/0xa0 net/sctp/auth.c:112\n sctp_set_owner_w net/sctp/socket.c:132 [inline]\n sctp_sendmsg_to_asoc+0xbd5/0x1a20 net/sctp/socket.c:1863\n sctp_sendmsg+0x1053/0x1d50 net/sctp/socket.c:2025\n inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:819\n sock_sendmsg_nosec net/socket.c:714 [inline]\n sock_sendmsg+0xcf/0x120 net/socket.c:734\n\nThis patch is to fix it by not replacing the sh_key when it returns\nerrors from sctp_auth_asoc_init_active_key() in sctp_auth_set_key().\nFor sctp_auth_set_active_key(), old active_key_id will be set back\nto asoc->active_key_id when the same thing happens."
}
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