CVE-2026-23292
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: scsi: target: Fix recursive locking in __configfs_open_file() In flush_write_buffer, &p->frag_sem is acquired and then the loaded store function is called, which, here, is target_core_item_dbroot_store(). This function called filp_open(), following which these functions were called (in reverse order), according to the call trace: down_read __configfs_open_file do_dentry_open vfs_open do_open path_openat do_filp_open file_open_name filp_open target_core_item_dbroot_store flush_write_buffer configfs_write_iter target_core_item_dbroot_store() tries to validate the new file path by trying to open the file path provided to it; however, in this case, the bug report shows: db_root: not a directory: /sys/kernel/config/target/dbroot indicating that the same configfs file was tried to be opened, on which it is currently working on. Thus, it is trying to acquire frag_sem semaphore of the same file of which it already holds the semaphore obtained in flush_write_buffer(), leading to acquiring the semaphore in a nested manner and a possibility of recursive locking. Fix this by modifying target_core_item_dbroot_store() to use kern_path() instead of filp_open() to avoid opening the file using filesystem-specific function __configfs_open_file(), and further modifying it to make this fix compatible.
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-03-25 11:16:24.357000
Last modified
2026-11-05 22:18:11.993000
View original CVE JSON
{
"id": "CVE-2026-23292",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-03-25T11:16:24.357",
"lastModified": "2026-11-05T22:18:11.993",
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{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: target: Fix recursive locking in __configfs_open_file()\n\nIn flush_write_buffer, &p->frag_sem is acquired and then the loaded store\nfunction is called, which, here, is target_core_item_dbroot_store(). This\nfunction called filp_open(), following which these functions were called\n(in reverse order), according to the call trace:\n\n down_read\n __configfs_open_file\n do_dentry_open\n vfs_open\n do_open\n path_openat\n do_filp_open\n file_open_name\n filp_open\n target_core_item_dbroot_store\n flush_write_buffer\n configfs_write_iter\n\ntarget_core_item_dbroot_store() tries to validate the new file path by\ntrying to open the file path provided to it; however, in this case, the bug\nreport shows:\n\ndb_root: not a directory: /sys/kernel/config/target/dbroot\n\nindicating that the same configfs file was tried to be opened, on which it\nis currently working on. Thus, it is trying to acquire frag_sem semaphore\nof the same file of which it already holds the semaphore obtained in\nflush_write_buffer(), leading to acquiring the semaphore in a nested manner\nand a possibility of recursive locking.\n\nFix this by modifying target_core_item_dbroot_store() to use kern_path()\ninstead of filp_open() to avoid opening the file using filesystem-specific\nfunction __configfs_open_file(), and further modifying it to make this fix\ncompatible."
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nscsi: target: Corrección de bloqueo recursivo en __configfs_open_file()\n\nEn flush_write_buffer, se adquiere &p->frag_sem y luego se llama a la función de almacenamiento cargada, que, aquí, es target_core_item_dbroot_store(). Esta función llamó a filp_open(), tras lo cual se llamaron a estas funciones (en orden inverso), según el rastro de llamadas:\n\n down_read\n __configfs_open_file\n do_dentry_open\n vfs_open\n do_open\n path_openat\n do_filp_open\n file_open_name\n filp_open\n target_core_item_dbroot_store\n flush_write_buffer\n configfs_write_iter\n\ntarget_core_item_dbroot_store() intenta validar la nueva ruta de archivo intentando abrir la ruta de archivo que se le proporcionó; sin embargo, en este caso, el informe de error muestra:\n\ndb_root: not a directory: /sys/kernel/config/target/dbroot\n\nindicando que se intentó abrir el mismo archivo configfs, en el que está trabajando actualmente. Así, está intentando adquirir el semáforo frag_sem del mismo archivo del que ya posee el semáforo obtenido en flush_write_buffer(), lo que lleva a adquirir el semáforo de forma anidada y una posibilidad de bloqueo recursivo.\n\nSolucione esto modificando target_core_item_dbroot_store() para usar kern_path() en lugar de filp_open() para evitar abrir el archivo usando la función específica del sistema de archivos __configfs_open_file(), y modificándolo aún más para hacer que esta corrección sea compatible."
}
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