{"id":"DEBIAN-CVE-2024-49976","details":"In the Linux kernel, the following vulnerability has been resolved:  tracing/timerlat: Drop interface_lock in stop_kthread()  stop_kthread() is the offline callback for \"trace/osnoise:online\", since commit 5bfbcd1ee57b (\"tracing/timerlat: Add interface_lock around clearing of kthread in stop_kthread()\"), the following ABBA deadlock scenario is introduced:  T1                            | T2 [BP]               | T3 [AP] osnoise_hotplug_workfn()      | work_for_cpu_fn()     | cpuhp_thread_fun()                               |   _cpu_down()         |   osnoise_cpu_die()   mutex_lock(&interface_lock) |                       |     stop_kthread()                               |     cpus_write_lock() |       mutex_lock(&interface_lock)   cpus_read_lock()            |     cpuhp_kick_ap()   |  As the interface_lock here in just for protecting the \"kthread\" field of the osn_var, use xchg() instead to fix this issue. Also use for_each_online_cpu() back in stop_per_cpu_kthreads() as it can take cpu_read_lock() again.","modified":"2026-09-15T09:03:13.113948154Z","published":"2024-10-21T18:15:18.353Z","upstream":["CVE-2024-49976"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2024-49976"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.11.4-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-49976.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.11.4-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-49976.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}