Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 0902b469bd25065aa0688c3cee6f11744c817e7c before 8c2c8445cda8f59c38dec7dc10509bcb23ae26a0; affected 0902b469bd25065aa0688c3cee6f11744c817e7c before 45fe76573a2557f632e248cc141342233f422b9a; affected 0902b469bd25065aa0688c3cee6f11744c817e7c before f36b01994d68ffc253c8296e2228dfe6e6431c03 |
| Linux / Linux | affected 2.6.36; unaffected 0 before 2.6.36; unaffected 6.6.67 through 6.6.*; unaffected 6.12.6 through 6.12.*; unaffected 6.13 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/8c2c8445cda8f59c38dec7dc10509bcb23ae26a0
- https://git.kernel.org/stable/c/45fe76573a2557f632e248cc141342233f422b9a
- https://git.kernel.org/stable/c/f36b01994d68ffc253c8296e2228dfe6e6431c03
ADP enrichment
No English description supplied.
No references supplied.