CVE-2022-49990

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2022-49990
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. 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.

7.8 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/13cccafe0edcd03bf1c841de8ab8a1c8e34f77d9 Patch
https://git.kernel.org/stable/c/25a95303b9e513cd2978aacc385d06e6fec23d07 Patch
https://git.kernel.org/stable/c/297ae7e87a87a001dd3dfeac1cb26a42fd929708 Patch
https://git.kernel.org/stable/c/8195e065abf3df84eb0ad2987e76a40f21d1791c Patch
https://git.kernel.org/stable/c/cacd522e6652fbc2dc0cc6ae11c4e30782fef14b Patch
https://git.kernel.org/stable/c/fbdc482d43eda40a70de4b0155843d5472f6de62 Patch
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.0:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.0:rc2:*:*:*:*:*:*
History

14 Nov 2025, 18:12

Type Values Removed Values Added
Summary
  • (es) 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.
First Time Linux
Linux linux Kernel
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.0:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.0:rc2:*:*:*:*:*:*
CWE CWE-415
References () https://git.kernel.org/stable/c/13cccafe0edcd03bf1c841de8ab8a1c8e34f77d9 - () https://git.kernel.org/stable/c/13cccafe0edcd03bf1c841de8ab8a1c8e34f77d9 - Patch
References () https://git.kernel.org/stable/c/25a95303b9e513cd2978aacc385d06e6fec23d07 - () https://git.kernel.org/stable/c/25a95303b9e513cd2978aacc385d06e6fec23d07 - Patch
References () https://git.kernel.org/stable/c/297ae7e87a87a001dd3dfeac1cb26a42fd929708 - () https://git.kernel.org/stable/c/297ae7e87a87a001dd3dfeac1cb26a42fd929708 - Patch
References () https://git.kernel.org/stable/c/8195e065abf3df84eb0ad2987e76a40f21d1791c - () https://git.kernel.org/stable/c/8195e065abf3df84eb0ad2987e76a40f21d1791c - Patch
References () https://git.kernel.org/stable/c/cacd522e6652fbc2dc0cc6ae11c4e30782fef14b - () https://git.kernel.org/stable/c/cacd522e6652fbc2dc0cc6ae11c4e30782fef14b - Patch
References () https://git.kernel.org/stable/c/fbdc482d43eda40a70de4b0155843d5472f6de62 - () https://git.kernel.org/stable/c/fbdc482d43eda40a70de4b0155843d5472f6de62 - Patch
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 7.8

18 Jun 2025, 11:15

Type Values Removed Values Added
New CVE
Information

Published : 2025-06-18 11:15

Updated : 2025-11-14 18:12

NVD link : CVE-2022-49990

Mitre link : CVE-2022-49990

CVE.ORG link : CVE-2022-49990

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-415

Double Free