FKIE_CVE-2023-53522

Vulnerability from fkie_nvd - Published: 2025-10-01 12:15 - Updated: 2026-01-26 20:04
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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().
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/34fbb7b45bae20b551dda24337c7761ca13ce69dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3756171b97c307d9df8b8ded1d883eec30172085Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/57dcd64c7e036299ef526b400a8d12b8a2352f26Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.3
linux linux_kernel 6.3
linux linux_kernel 6.3
linux linux_kernel 6.3
linux linux_kernel 6.3
linux linux_kernel 6.3
To clipboard 

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    {
      "lang": "en",
      "value": "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()."
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  "id": "CVE-2023-53522",
  "lastModified": "2026-01-26T20:04:05.777",
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          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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}


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