CVE-2024-54683
Full vulnerability record from the local CVENow database.
Description
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. 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.
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-01-11 13:15:27.490000
Last modified
2026-10-30 13:17:46.267000
View original CVE JSON
{
"id": "CVE-2024-54683",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-01-11T13:15:27.490",
"lastModified": "2026-10-30T13:17:46.267",
"vulnStatus": "Modified",
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{
"lang": "en",
"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."
},
{
"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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