CVE-2026-46259
Estado: AnalizadaAlta (7.8)—
In the Linux kernel, the following vulnerability has been resolved:
procfs: fix missing RCU protection when reading real_parent in do_task_stat()
When reading /proc/[pid]/stat, do_task_stat() accesses task->real_parent without proper RCU protection, which leads to:
This patch uses task_ppid_nr_ns() instead of task_tgid_nr_ns() to add proper RCU protection for accessing task->real_parent.
Detalles técnicos trazas, registros y código del informe original
cpu 0 cpu 1
----- -----
do_task_stat
var = task->real_parent
release_task
call_rcu(delayed_put_task_struct)
task_tgid_nr_ns(var)
rcu_read_lock <--- Too late to protect task->real_parent!
task_pid_ptr <--- UAF!
rcu_read_unlockCVSS
- 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: 0.18%
- Percentil entre todas las CVEs puntuadas: 6
- 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).
🎯 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 Interpreterexecution60 %
Vulnerabilidad local (AV:L, PR:L) sin interacción que permite acceso-use-after-free en kernel Linux, explotable para ejecución de código con privilegios elevados (I:H, C:H, A:H).
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
- NVD-CWE-noinfo
Referencias
- https://git.kernel.org/stable/c/0e64bd46a04a4fd61279aca9f53a664e9e5f7e7e
- https://git.kernel.org/stable/c/1c8dc5b5517546c68ffae40b948336122bb61306
- https://git.kernel.org/stable/c/4f9ae386861e280b7631ca252f798d25575627ee
- https://git.kernel.org/stable/c/73ec7c96601d61d52310c659145bb06d933a0fa6
- https://git.kernel.org/stable/c/76149d53502cf17ef3ae454ff384551236fba867
- https://git.kernel.org/stable/c/c93a33f28f915d446eea6fb3f0e1def0b3af1982
- https://git.kernel.org/stable/c/dd8b13cb4ff1a4545a214ed897fdf2bc341155b6
- https://git.kernel.org/stable/c/fefa0fcd78be465b7ad4c497fa6ec90d64194c04
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nprocfs: fix missing RCU protection when reading real_parent in do_task_stat()\n\nWhen reading /proc/[pid]/stat, do_task_stat() accesses task->real_parent\nwithout proper RCU protection, which leads to:\n\n cpu 0 cpu 1\n ----- -----\n do_task_stat\n var = task->real_parent\n release_task\n call_rcu(delayed_put_task_struct)\n task_tgid_nr_ns(var)\n rcu_read_lock <--- Too late to protect task->real_parent!\n task_pid_ptr <--- UAF!\n rcu_read_unlock\n\nThis patch uses task_ppid_nr_ns() instead of task_tgid_nr_ns() to add\nproper RCU protection for accessing task->real_parent."
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nprocfs: corrige la falta de protección RCU al leer real_parent en do_task_stat()\n\nAl leer /proc/[pid]/stat, do_task_stat() accede a task->real_parent sin la protección RCU adecuada, lo que lleva a:\n\n cpu 0 cpu 1\n ----- -----\n do_task_stat\n var = task->real_parent\n release_task\n call_rcu(delayed_put_task_struct)\n task_tgid_nr_ns(var)\n rcu_read_lock <--- ¡Demasiado tarde para proteger task->real_parent!\n task_pid_ptr <--- ¡UAF!\n rcu_read_unlock\n\nEste parche utiliza task_ppid_nr_ns() en lugar de task_tgid_nr_ns() para añadir la protección RCU adecuada para acceder a task->real_parent."
}
],
"lastModified": "2026-07-22T20:10:00.127",
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