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CVE-2022-49990

Estado: ModificadaAlta (7.8)—

In the Linux kernel, the following vulnerability has been resolved:

s390: fix double free of GS and RI CBs on fork() failure

The pointers for guarded storage and runtime instrumentation control blocks are stored in the thread_struct of the associated task. These pointers are initially copied on fork() via arch_dup_task_struct() and then cleared via copy_thread() before fork() returns. If fork() happens to fail after the initial task dup and before copy_thread(), the newly allocated task and associated thread_struct memory are freed via free_task() -> arch_release_task_struct(). This results in a double free of the guarded storage and runtime info structs because the fields in the failed task still refer to memory associated with the source task.

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This problem can manifest as a BUG_ON() in set_freepointer() (with CONFIG_SLAB_FREELIST_HARDENED enabled) or KASAN splat (if enabled) when running trinity syscall fuzz tests on s390x. To avoid this problem, clear the associated pointer fields in arch_dup_task_struct() immediately after the new task is copied. Note that the RI flag is still cleared in copy_thread() because it resides in thread stack memory and that is where stack info is copied.

CVSS

Probabilidad de explotación (EPSS)

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.

Vulnerabilidad local (AV:L/PR:L) que causa double free de estructuras de memoria en fork(), explotable por usuario local para DoS o corrupción; pista sugiere escalada pero el acceso local y fallo de fork apuntan a negación de servicio.

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

Threat Intelligence ProgramFilter Network TrafficExecution PreventionApplication Isolation and SandboxingExploit ProtectionUpdate Software

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390: fix double free of GS and RI CBs on fork() failure\n\nThe pointers for guarded storage and runtime instrumentation control\nblocks are stored in the thread_struct of the associated task. These\npointers are initially copied on fork() via arch_dup_task_struct()\nand then cleared via copy_thread() before fork() returns. If fork()\nhappens to fail after the initial task dup and before copy_thread(),\nthe newly allocated task and associated thread_struct memory are\nfreed via free_task() -> arch_release_task_struct(). This results in\na double free of the guarded storage and runtime info structs\nbecause the fields in the failed task still refer to memory\nassociated with the source task.\n\nThis problem can manifest as a BUG_ON() in set_freepointer() (with\nCONFIG_SLAB_FREELIST_HARDENED enabled) or KASAN splat (if enabled)\nwhen running trinity syscall fuzz tests on s390x. To avoid this\nproblem, clear the associated pointer fields in\narch_dup_task_struct() immediately after the new task is copied.\nNote that the RI flag is still cleared in copy_thread() because it\nresides in thread stack memory and that is where stack info is\ncopied."
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      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: s390: se corrige la doble liberación de los bloques de control de instrumentación de GS y RI en el fallo de fork() Los punteros para los bloques de control de instrumentación de almacenamiento protegido y tiempo de ejecución se almacenan en el thread_struct de la tarea asociada. Estos punteros se copian inicialmente en fork() mediante arch_dup_task_struct() y luego se borran mediante copy_thread() antes de que fork() regrese. Si fork() falla después del dup de la tarea inicial y antes de copy_thread(), la tarea recién asignada y la memoria thread_struct asociada se liberan mediante free_task() -> arch_release_task_struct(). Esto resulta en una doble liberación de las estructuras de información de almacenamiento protegido y tiempo de ejecución porque los campos en la tarea fallida todavía hacen referencia a la memoria asociada con la tarea de origen. Este problema puede manifestarse como un BUG_ON() en set_freepointer() (con CONFIG_SLAB_FREELIST_HARDENED habilitado) o un error de KASAN (si está habilitado) al ejecutar pruebas de fuzzing de llamadas al sistema de Trinity en s390x. Para evitar este problema, borre los campos de puntero asociados en arch_dup_task_struct() inmediatamente después de copiar la nueva tarea. Tenga en cuenta que el indicador RI permanece borrado en copy_thread() porque reside en la memoria de la pila de subprocesos, donde se copia la información de la pila."
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  "lastModified": "2026-08-04T10:18:02.127",
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