CVE-2024-54683Medium· 5.5▾ SunlitIn 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…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 30.3 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the CISA ADP record, not NVD.
Exploit-prediction probability, daily snapshots since Nov 3.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
0.2% → 0.2%
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.
Linux >= 0902b469bd25065aa0688c3cee6f11744c817e7c < 5493d84a40f0e61da74e1b0db640845997836b4eLinux >= 0902b469bd25065aa0688c3cee6f11744c817e7c < 8c2c8445cda8f59c38dec7dc10509bcb23ae26a0Linux >= 0902b469bd25065aa0688c3cee6f11744c817e7c < 45fe76573a2557f632e248cc141342233f422b9aLinux >= 0902b469bd25065aa0688c3cee6f11744c817e7c < f36b01994d68ffc253c8296e2228dfe6e6431c03Linux 2.6.36Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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