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CVE-2024-54683
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CVE-2024-54683
MITRE ATT&CK
Collection
Command and Control
Credential Access
Defense Evasion
Discovery
Execution
Exfiltration
Impact
Initial Access
Lateral Movement
Persistence
Privilege Escalation
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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.
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