{"id":"CVE-2024-54683","title":"netfilter: IDLETIMER: Fix for possible ABBA deadlock","summary":"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…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"adp","vendor":"Linux","product":"Linux","affected":["Linux >= 0902b469bd25065aa0688c3cee6f11744c817e7c < 5493d84a40f0e61da74e1b0db640845997836b4e","Linux >= 0902b469bd25065aa0688c3cee6f11744c817e7c < 8c2c8445cda8f59c38dec7dc10509bcb23ae26a0","Linux >= 0902b469bd25065aa0688c3cee6f11744c817e7c < 45fe76573a2557f632e248cc141342233f422b9a","Linux >= 0902b469bd25065aa0688c3cee6f11744c817e7c < f36b01994d68ffc253c8296e2228dfe6e6431c03","Linux 2.6.36"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2025-10-01T19:55:27.468543Z"},"published":"2025-01-11","updated":"2026-10-30","sourceUpdated":"2026-10-30T12:20:16.039Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2024-54683","references":[{"url":"https://git.kernel.org/stable/c/5493d84a40f0e61da74e1b0db640845997836b4e"},{"url":"https://git.kernel.org/stable/c/8c2c8445cda8f59c38dec7dc10509bcb23ae26a0"},{"url":"https://git.kernel.org/stable/c/45fe76573a2557f632e248cc141342233f422b9a"},{"url":"https://git.kernel.org/stable/c/f36b01994d68ffc253c8296e2228dfe6e6431c03"}],"tags":["cve.org"],"epss":0.00162,"epssPercentile":0.05415,"ingestedAt":"2026-11-03T14:47:02.521Z","slug":"CVE-2024-54683","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= 0902b469bd25065aa0688c3cee6f11744c817e7c < 5493d84a40f0e61da74e1b0db640845997836b4e`\n- `Linux >= 0902b469bd25065aa0688c3cee6f11744c817e7c < 8c2c8445cda8f59c38dec7dc10509bcb23ae26a0`\n- `Linux >= 0902b469bd25065aa0688c3cee6f11744c817e7c < 45fe76573a2557f632e248cc141342233f422b9a`\n- `Linux >= 0902b469bd25065aa0688c3cee6f11744c817e7c < f36b01994d68ffc253c8296e2228dfe6e6431c03`\n- `Linux 2.6.36`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}