{"id":"CVE-2024-49976","summary":"tracing/timerlat: Drop interface_lock in stop_kthread()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ntracing/timerlat: Drop interface_lock in stop_kthread()\n\nstop_kthread() is the offline callback for \"trace/osnoise:online\", since\ncommit 5bfbcd1ee57b (\"tracing/timerlat: Add interface_lock around clearing\nof kthread in stop_kthread()\"), the following ABBA deadlock scenario is\nintroduced:\n\nT1                            | T2 [BP]               | T3 [AP]\nosnoise_hotplug_workfn()      | work_for_cpu_fn()     | cpuhp_thread_fun()\n                              |   _cpu_down()         |   osnoise_cpu_die()\n  mutex_lock(&interface_lock) |                       |     stop_kthread()\n                              |     cpus_write_lock() |       mutex_lock(&interface_lock)\n  cpus_read_lock()            |     cpuhp_kick_ap()   |\n\nAs the interface_lock here in just for protecting the \"kthread\" field of\nthe osn_var, use xchg() instead to fix this issue. Also use\nfor_each_online_cpu() back in stop_per_cpu_kthreads() as it can take\ncpu_read_lock() again.","modified":"2026-04-16T04:30:23.113903879Z","published":"2024-10-21T18:02:23.774Z","related":["SUSE-SU-2024:4314-1","SUSE-SU-2024:4316-1","SUSE-SU-2024:4318-1","SUSE-SU-2024:4387-1","SUSE-SU-2025:20163-1","SUSE-SU-2025:20164-1","SUSE-SU-2025:20246-1","SUSE-SU-2025:20247-1","USN-7276-1","USN-7277-1","openSUSE-SU-2024:14500-1","openSUSE-SU-2025:14705-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/49xxx/CVE-2024-49976.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/09cb44cc3d3df7ade2cebc939d6257a2fa8afc7a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a4a05ceffe8fad68b45de38fe2311bda619e76e2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b484a02c9cedf8703eff8f0756f94618004bd165"},{"type":"WEB","url":"https://git.kernel.org/stable/c/db8571a9a098086608c11a15856ff585789e67e8"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/49xxx/CVE-2024-49976.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-49976"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"b4fdabffae14cca2c80d99bd81f3f27239ac7f5e"},{"fixed":"a4a05ceffe8fad68b45de38fe2311bda619e76e2"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4679272d5252720746fd9c5465352cbc5665f230"},{"fixed":"09cb44cc3d3df7ade2cebc939d6257a2fa8afc7a"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5bfbcd1ee57b607fd29e4645c7f350dd385dd9ad"},{"fixed":"db8571a9a098086608c11a15856ff585789e67e8"},{"fixed":"b484a02c9cedf8703eff8f0756f94618004bd165"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-49976.json"}}],"schema_version":"1.7.5"}