CVE-2024-40998
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: ext4: fix uninitialized ratelimit_state->lock access in __ext4_fill_super() In the following concurrency we will access the uninitialized rs->lock: ext4_fill_super ext4_register_sysfs // sysfs registered msg_ratelimit_interval_ms // Other processes modify rs->interval to // non-zero via msg_ratelimit_interval_ms ext4_orphan_cleanup ext4_msg(sb, KERN_INFO, "Errors on filesystem, " __ext4_msg ___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state) if (!rs->interval) // do nothing if interval is 0 return 1; raw_spin_trylock_irqsave(&rs->lock, flags) raw_spin_trylock(lock) _raw_spin_trylock __raw_spin_trylock spin_acquire(&lock->dep_map, 0, 1, _RET_IP_) lock_acquire __lock_acquire register_lock_class assign_lock_key dump_stack(); ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10); raw_spin_lock_init(&rs->lock); // init rs->lock here and get the following dump_stack: ========================================================= INFO: trying to register non-static key. The code is fine but needs lockdep annotation, or maybe you didn't initialize this object before use? turning off the locking correctness validator. CPU: 12 PID: 753 Comm: mount Tainted: G E 6.7.0-rc6-next-20231222 #504 [...] Call Trace: dump_stack_lvl+0xc5/0x170 dump_stack+0x18/0x30 register_lock_class+0x740/0x7c0 __lock_acquire+0x69/0x13a0 lock_acquire+0x120/0x450 _raw_spin_trylock+0x98/0xd0 ___ratelimit+0xf6/0x220 __ext4_msg+0x7f/0x160 [ext4] ext4_orphan_cleanup+0x665/0x740 [ext4] __ext4_fill_super+0x21ea/0x2b10 [ext4] ext4_fill_super+0x14d/0x360 [ext4] [...] ========================================================= Normally interval is 0 until s_msg_ratelimit_state is initialized, so ___ratelimit() does nothing. But registering sysfs precedes initializing rs->lock, so it is possible to change rs->interval to a non-zero value via the msg_ratelimit_interval_ms interface of sysfs while rs->lock is uninitialized, and then a call to ext4_msg triggers the problem by accessing an uninitialized rs->lock. Therefore register sysfs after all initializations are complete to avoid such problems.
View original CVE JSON
{
"id": "CVE-2024-40998",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2024-07-12T13:15:20.857",
"lastModified": "2026-10-30T13:17:30.080",
"vulnStatus": "Modified",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix uninitialized ratelimit_state->lock access in __ext4_fill_super()\n\nIn the following concurrency we will access the uninitialized rs->lock:\n\next4_fill_super\n ext4_register_sysfs\n // sysfs registered msg_ratelimit_interval_ms\n // Other processes modify rs->interval to\n // non-zero via msg_ratelimit_interval_ms\n ext4_orphan_cleanup\n ext4_msg(sb, KERN_INFO, \"Errors on filesystem, \"\n __ext4_msg\n ___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state)\n if (!rs->interval) // do nothing if interval is 0\n return 1;\n raw_spin_trylock_irqsave(&rs->lock, flags)\n raw_spin_trylock(lock)\n _raw_spin_trylock\n __raw_spin_trylock\n spin_acquire(&lock->dep_map, 0, 1, _RET_IP_)\n lock_acquire\n __lock_acquire\n register_lock_class\n assign_lock_key\n dump_stack();\n ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);\n raw_spin_lock_init(&rs->lock);\n // init rs->lock here\n\nand get the following dump_stack:\n\n=========================================================\nINFO: trying to register non-static key.\nThe code is fine but needs lockdep annotation, or maybe\nyou didn't initialize this object before use?\nturning off the locking correctness validator.\nCPU: 12 PID: 753 Comm: mount Tainted: G E 6.7.0-rc6-next-20231222 #504\n[...]\nCall Trace:\n dump_stack_lvl+0xc5/0x170\n dump_stack+0x18/0x30\n register_lock_class+0x740/0x7c0\n __lock_acquire+0x69/0x13a0\n lock_acquire+0x120/0x450\n _raw_spin_trylock+0x98/0xd0\n ___ratelimit+0xf6/0x220\n __ext4_msg+0x7f/0x160 [ext4]\n ext4_orphan_cleanup+0x665/0x740 [ext4]\n __ext4_fill_super+0x21ea/0x2b10 [ext4]\n ext4_fill_super+0x14d/0x360 [ext4]\n[...]\n=========================================================\n\nNormally interval is 0 until s_msg_ratelimit_state is initialized, so\n___ratelimit() does nothing. But registering sysfs precedes initializing\nrs->lock, so it is possible to change rs->interval to a non-zero value\nvia the msg_ratelimit_interval_ms interface of sysfs while rs->lock is\nuninitialized, and then a call to ext4_msg triggers the problem by\naccessing an uninitialized rs->lock. Therefore register sysfs after all\ninitializations are complete to avoid such problems."
},
{
"lang": "es",
"value": "En el kernel de Linux se ha resuelto la siguiente vulnerabilidad: ext4: arreglar ratelimit_state no inicializado->bloquear acceso en __ext4_fill_super() En la siguiente concurrencia accederemos al rs->lock no inicializado: ext4_fill_super ext4_register_sysfs // sysfs registrado msg_ratelimit_interval_ms // Otros procesos modificar rs->interval a // distinto de cero a través de msg_ratelimit_interval_ms ext4_orphan_cleanup ext4_msg(sb, KERN_INFO, \"Errores en el sistema de archivos, \" __ext4_msg ___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state) if (!rs->interval) // hacer nada si el intervalo es 0 devuelve 1; ->s_msg_ratelimit_state , 5 * HZ, 10); raw_spin_lock_init(&rs->lock); // inicia rs->lock aquí y obtiene el siguiente dump_stack: ==================== ===================================== INFORMACIÓN: intentando registrar una clave no estática. El código está bien pero necesita una anotación de bloqueo, ¿o tal vez no inicializó este objeto antes de usarlo? apagando el validador de corrección de bloqueo. CPU: 12 PID: 753 Comunicaciones: montaje contaminado: GE 6.7.0-rc6-next-20231222 #504 [...] Seguimiento de llamadas: dump_stack_lvl+0xc5/0x170 dump_stack+0x18/0x30 Register_lock_class+0x740/0x7c0 __lock_acquire+0x69/ 0x13a0 lock_acquire+0x120/0x450 _raw_spin_trylock+0x98/0xd0 ___ratelimit+0xf6/0x220 __ext4_msg+0x7f/0x160 [ext4] ext4_orphan_cleanup+0x665/0x740 [ext4] 0x2b10 [ext4] text4_fill_super+0x14d/0x360 [ext4] [. ..] ================================================= ========== Normalmente el intervalo es 0 hasta que se inicializa s_msg_ratelimit_state, por lo que ___ratelimit() no hace nada. Pero el registro de sysfs precede a la inicialización de rs->lock, por lo que es posible cambiar rs->interval a un valor distinto de cero a través de la interfaz msg_ratelimit_interval_ms de sysfs mientras rs->lock no está inicializado, y luego una llamada a ext4_msg desencadena el problema al accediendo a un rs->lock no inicializado. Por lo tanto, registre sysfs después de que se completen todas las inicializaciones para evitar este tipo de problemas."
}
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"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"attackVector": "LOCAL",
"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"availabilityImpact": "HIGH"
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"id": "CVE-2024-40998",
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"source": "[email protected]",
"type": "Primary",
"description": [
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