{"id":"DEBIAN-CVE-2023-53522","details":"In the Linux kernel, the following vulnerability has been resolved:  cgroup,freezer: hold cpu_hotplug_lock before freezer_mutex  syzbot is reporting circular locking dependency between cpu_hotplug_lock and freezer_mutex, for commit f5d39b020809 (\"freezer,sched: Rewrite core freezer logic\") replaced atomic_inc() in freezer_apply_state() with static_branch_inc() which holds cpu_hotplug_lock.  cpu_hotplug_lock =\u003e cgroup_threadgroup_rwsem =\u003e freezer_mutex    cgroup_file_write() {     cgroup_procs_write() {       __cgroup_procs_write() {         cgroup_procs_write_start() {           cgroup_attach_lock() {             cpus_read_lock() {               percpu_down_read(&cpu_hotplug_lock);             }             percpu_down_write(&cgroup_threadgroup_rwsem);           }         }         cgroup_attach_task() {           cgroup_migrate() {             cgroup_migrate_execute() {               freezer_attach() {                 mutex_lock(&freezer_mutex);                 (...snipped...)               }             }           }         }         (...snipped...)       }     }   }  freezer_mutex =\u003e cpu_hotplug_lock    cgroup_file_write() {     freezer_write() {       freezer_change_state() {         mutex_lock(&freezer_mutex);         freezer_apply_state() {           static_branch_inc(&freezer_active) {             static_key_slow_inc() {               cpus_read_lock();               static_key_slow_inc_cpuslocked();               cpus_read_unlock();             }           }         }         mutex_unlock(&freezer_mutex);       }     }   }  Swap locking order by moving cpus_read_lock() in freezer_apply_state() to before mutex_lock(&freezer_mutex) in freezer_change_state().","modified":"2026-09-01T20:05:16.048152231Z","published":"2025-10-01T12:15:56.617Z","upstream":["CVE-2023-53522"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2023-53522"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.25-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-53522.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.25-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-53522.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.25-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-53522.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:H/I:H/A:H"}]}