ghsa-p96p-6mvh-mgpr
Vulnerability from github
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 => cgroup_threadgroup_rwsem => 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 => 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().
{
"affected": [],
"aliases": [
"CVE-2023-53522"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-10-01T12:15:56Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncgroup,freezer: hold cpu_hotplug_lock before freezer_mutex\n\nsyzbot is reporting circular locking dependency between cpu_hotplug_lock\nand freezer_mutex, for commit f5d39b020809 (\"freezer,sched: Rewrite core\nfreezer logic\") replaced atomic_inc() in freezer_apply_state() with\nstatic_branch_inc() which holds cpu_hotplug_lock.\n\ncpu_hotplug_lock =\u003e cgroup_threadgroup_rwsem =\u003e freezer_mutex\n\n cgroup_file_write() {\n cgroup_procs_write() {\n __cgroup_procs_write() {\n cgroup_procs_write_start() {\n cgroup_attach_lock() {\n cpus_read_lock() {\n percpu_down_read(\u0026cpu_hotplug_lock);\n }\n percpu_down_write(\u0026cgroup_threadgroup_rwsem);\n }\n }\n cgroup_attach_task() {\n cgroup_migrate() {\n cgroup_migrate_execute() {\n freezer_attach() {\n mutex_lock(\u0026freezer_mutex);\n (...snipped...)\n }\n }\n }\n }\n (...snipped...)\n }\n }\n }\n\nfreezer_mutex =\u003e cpu_hotplug_lock\n\n cgroup_file_write() {\n freezer_write() {\n freezer_change_state() {\n mutex_lock(\u0026freezer_mutex);\n freezer_apply_state() {\n static_branch_inc(\u0026freezer_active) {\n static_key_slow_inc() {\n cpus_read_lock();\n static_key_slow_inc_cpuslocked();\n cpus_read_unlock();\n }\n }\n }\n mutex_unlock(\u0026freezer_mutex);\n }\n }\n }\n\nSwap locking order by moving cpus_read_lock() in freezer_apply_state()\nto before mutex_lock(\u0026freezer_mutex) in freezer_change_state().",
"id": "GHSA-p96p-6mvh-mgpr",
"modified": "2025-10-01T12:30:31Z",
"published": "2025-10-01T12:30:31Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-53522"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/34fbb7b45bae20b551dda24337c7761ca13ce69d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3756171b97c307d9df8b8ded1d883eec30172085"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/57dcd64c7e036299ef526b400a8d12b8a2352f26"
}
],
"schema_version": "1.4.0",
"severity": []
}
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