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CVE-2024-54683

Estado: ModificadaMedia (5.5)—

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

netfilter: IDLETIMER: Fix for possible ABBA deadlock

Deletion of the last rule referencing a given idletimer may happen at the same time as a read of its file in sysfs:

| ====================================================== | WARNING: possible circular locking dependency detected | 6.12.0-rc7-01692-g5e9a28f41134-dirty #594 Not tainted | ------------------------------------------------------ | iptables/3303 is trying to acquire lock: | ffff8881057e04b8 (kn->active#48){++++}-{0:0}, at: __kernfs_remove+0x20 | | but task is already holding lock: | ffffffffa0249068 (list_mutex){+.+.}-{3:3}, at: idletimer_tg_destroy_v] | | which lock already depends on the new lock.

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A simple reproducer is:

| #!/bin/bash | | while true; do | iptables -A INPUT -i foo -j IDLETIMER --timeout 10 --label "testme" | iptables -D INPUT -i foo -j IDLETIMER --timeout 10 --label "testme" | done & | while true; do | cat /sys/class/xt_idletimer/timers/testme >/dev/null | done

Avoid this by freeing list_mutex right after deleting the element from the list, then continuing with the teardown.

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).

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\nnetfilter: IDLETIMER: Fix for possible ABBA deadlock\n\nDeletion of the last rule referencing a given idletimer may happen at\nthe same time as a read of its file in sysfs:\n\n| ======================================================\n| WARNING: possible circular locking dependency detected\n| 6.12.0-rc7-01692-g5e9a28f41134-dirty #594 Not tainted\n| ------------------------------------------------------\n| iptables/3303 is trying to acquire lock:\n| ffff8881057e04b8 (kn->active#48){++++}-{0:0}, at: __kernfs_remove+0x20\n|\n| but task is already holding lock:\n| ffffffffa0249068 (list_mutex){+.+.}-{3:3}, at: idletimer_tg_destroy_v]\n|\n| which lock already depends on the new lock.\n\nA simple reproducer is:\n\n| #!/bin/bash\n|\n| while true; do\n|         iptables -A INPUT -i foo -j IDLETIMER --timeout 10 --label \"testme\"\n|         iptables -D INPUT -i foo -j IDLETIMER --timeout 10 --label \"testme\"\n| done &\n| while true; do\n|         cat /sys/class/xt_idletimer/timers/testme >/dev/null\n| done\n\nAvoid this by freeing list_mutex right after deleting the element from\nthe list, then continuing with the teardown."
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      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: netfilter: IDLETIMER: Corrección de un posible bloqueo de ABBA La eliminación de la última regla que hace referencia a un temporizador inactivo determinado puede ocurrir al mismo tiempo que una lectura de su archivo en sysfs: | ======================================================== | ADVERTENCIA: se detectó una posible dependencia de bloqueo circular | 6.12.0-rc7-01692-g5e9a28f41134-dirty #594 No contaminado | ------------------------------------------------------ | iptables/3303 está intentando adquirir el bloqueo: | ffff8881057e04b8 (kn->active#48){++++}-{0:0}, at: __kernfs_remove+0x20 | | pero la tarea ya tiene el bloqueo: | ffffffffa0249068 (list_mutex){+.+.}-{3:3}, at: idletimer_tg_destroy_v] | | cuyo bloqueo ya depende del nuevo bloqueo. Un reproductor simple es: | #!/bin/bash | | mientras es verdadero; hacer | iptables -A INPUT -i foo -j IDLETIMER --timeout 10 --label \"testme\" | iptables -D INPUT -i foo -j IDLETIMER --timeout 10 --label \"testme\" | hecho & | mientras es verdadero; hacer | cat /sys/class/xt_idletimer/timers/testme >/dev/null | Evite esto liberando list_mutex inmediatamente después de eliminar el elemento de la lista y luego continúe con el desmontaje."
    }
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  "lastModified": "2026-06-17T08:10:38.287",
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