CVE-2025-39953 (GCVE-0-2025-39953)
Vulnerability from cvelistv5
Published
2025-10-04 07:31
Modified
2025-10-04 07:37
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: cgroup: split cgroup_destroy_wq into 3 workqueues A hung task can occur during [1] LTP cgroup testing when repeatedly mounting/unmounting perf_event and net_prio controllers with systemd.unified_cgroup_hierarchy=1. The hang manifests in cgroup_lock_and_drain_offline() during root destruction. Related case: cgroup_fj_function_perf_event cgroup_fj_function.sh perf_event cgroup_fj_function_net_prio cgroup_fj_function.sh net_prio Call Trace: cgroup_lock_and_drain_offline+0x14c/0x1e8 cgroup_destroy_root+0x3c/0x2c0 css_free_rwork_fn+0x248/0x338 process_one_work+0x16c/0x3b8 worker_thread+0x22c/0x3b0 kthread+0xec/0x100 ret_from_fork+0x10/0x20 Root Cause: CPU0 CPU1 mount perf_event umount net_prio cgroup1_get_tree cgroup_kill_sb rebind_subsystems // root destruction enqueues // cgroup_destroy_wq // kill all perf_event css // one perf_event css A is dying // css A offline enqueues cgroup_destroy_wq // root destruction will be executed first css_free_rwork_fn cgroup_destroy_root cgroup_lock_and_drain_offline // some perf descendants are dying // cgroup_destroy_wq max_active = 1 // waiting for css A to die Problem scenario: 1. CPU0 mounts perf_event (rebind_subsystems) 2. CPU1 unmounts net_prio (cgroup_kill_sb), queuing root destruction work 3. A dying perf_event CSS gets queued for offline after root destruction 4. Root destruction waits for offline completion, but offline work is blocked behind root destruction in cgroup_destroy_wq (max_active=1) Solution: Split cgroup_destroy_wq into three dedicated workqueues: cgroup_offline_wq – Handles CSS offline operations cgroup_release_wq – Manages resource release cgroup_free_wq – Performs final memory deallocation This separation eliminates blocking in the CSS free path while waiting for offline operations to complete. [1] https://github.com/linux-test-project/ltp/blob/master/runtest/controllers
References
Impacted products
Vendor Product Version
Linux Linux Version: 334c3679ec4b2b113c35ebe37d2018b112dd5013
Version: 334c3679ec4b2b113c35ebe37d2018b112dd5013
Version: 334c3679ec4b2b113c35ebe37d2018b112dd5013
Version: 334c3679ec4b2b113c35ebe37d2018b112dd5013
Version: 334c3679ec4b2b113c35ebe37d2018b112dd5013
Version: 334c3679ec4b2b113c35ebe37d2018b112dd5013
Version: 334c3679ec4b2b113c35ebe37d2018b112dd5013
Version: 334c3679ec4b2b113c35ebe37d2018b112dd5013
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{
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          "product": "Linux",
          "programFiles": [
            "kernel/cgroup/cgroup.c"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncgroup: split cgroup_destroy_wq into 3 workqueues\n\nA hung task can occur during [1] LTP cgroup testing when repeatedly\nmounting/unmounting perf_event and net_prio controllers with\nsystemd.unified_cgroup_hierarchy=1. The hang manifests in\ncgroup_lock_and_drain_offline() during root destruction.\n\nRelated case:\ncgroup_fj_function_perf_event cgroup_fj_function.sh perf_event\ncgroup_fj_function_net_prio cgroup_fj_function.sh net_prio\n\nCall Trace:\n\tcgroup_lock_and_drain_offline+0x14c/0x1e8\n\tcgroup_destroy_root+0x3c/0x2c0\n\tcss_free_rwork_fn+0x248/0x338\n\tprocess_one_work+0x16c/0x3b8\n\tworker_thread+0x22c/0x3b0\n\tkthread+0xec/0x100\n\tret_from_fork+0x10/0x20\n\nRoot Cause:\n\nCPU0                            CPU1\nmount perf_event                umount net_prio\ncgroup1_get_tree                cgroup_kill_sb\nrebind_subsystems               // root destruction enqueues\n\t\t\t\t// cgroup_destroy_wq\n// kill all perf_event css\n                                // one perf_event css A is dying\n                                // css A offline enqueues cgroup_destroy_wq\n                                // root destruction will be executed first\n                                css_free_rwork_fn\n                                cgroup_destroy_root\n                                cgroup_lock_and_drain_offline\n                                // some perf descendants are dying\n                                // cgroup_destroy_wq max_active = 1\n                                // waiting for css A to die\n\nProblem scenario:\n1. CPU0 mounts perf_event (rebind_subsystems)\n2. CPU1 unmounts net_prio (cgroup_kill_sb), queuing root destruction work\n3. A dying perf_event CSS gets queued for offline after root destruction\n4. Root destruction waits for offline completion, but offline work is\n   blocked behind root destruction in cgroup_destroy_wq (max_active=1)\n\nSolution:\nSplit cgroup_destroy_wq into three dedicated workqueues:\ncgroup_offline_wq \u2013 Handles CSS offline operations\ncgroup_release_wq \u2013 Manages resource release\ncgroup_free_wq \u2013 Performs final memory deallocation\n\nThis separation eliminates blocking in the CSS free path while waiting for\noffline operations to complete.\n\n[1] https://github.com/linux-test-project/ltp/blob/master/runtest/controllers"
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      "providerMetadata": {
        "dateUpdated": "2025-10-04T07:37:08.557Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/993049c9b1355c78918344a6403427d53f9ee700"
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          "url": "https://git.kernel.org/stable/c/4a1e3ec28e8062cd9f339aa6a942df9c5bcb6811"
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          "url": "https://git.kernel.org/stable/c/ded4d207a3209a834b6831ceec7f39b934c74802"
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          "url": "https://git.kernel.org/stable/c/05e0b03447cf215ec384210441b34b7a3b16e8b0"
        },
        {
          "url": "https://git.kernel.org/stable/c/79f919a89c9d06816dbdbbd168fa41d27411a7f9"
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      ],
      "title": "cgroup: split cgroup_destroy_wq into 3 workqueues",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39953",
    "datePublished": "2025-10-04T07:31:13.237Z",
    "dateReserved": "2025-04-16T07:20:57.149Z",
    "dateUpdated": "2025-10-04T07:37:08.557Z",
    "state": "PUBLISHED"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-39953\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-10-04T08:15:48.627\",\"lastModified\":\"2025-10-06T14:56:47.823\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ncgroup: split cgroup_destroy_wq into 3 workqueues\\n\\nA hung task can occur during [1] LTP cgroup testing when repeatedly\\nmounting/unmounting perf_event and net_prio controllers with\\nsystemd.unified_cgroup_hierarchy=1. The hang manifests in\\ncgroup_lock_and_drain_offline() during root destruction.\\n\\nRelated case:\\ncgroup_fj_function_perf_event cgroup_fj_function.sh perf_event\\ncgroup_fj_function_net_prio cgroup_fj_function.sh net_prio\\n\\nCall Trace:\\n\\tcgroup_lock_and_drain_offline+0x14c/0x1e8\\n\\tcgroup_destroy_root+0x3c/0x2c0\\n\\tcss_free_rwork_fn+0x248/0x338\\n\\tprocess_one_work+0x16c/0x3b8\\n\\tworker_thread+0x22c/0x3b0\\n\\tkthread+0xec/0x100\\n\\tret_from_fork+0x10/0x20\\n\\nRoot Cause:\\n\\nCPU0                            CPU1\\nmount perf_event                umount net_prio\\ncgroup1_get_tree                cgroup_kill_sb\\nrebind_subsystems               // root destruction enqueues\\n\\t\\t\\t\\t// cgroup_destroy_wq\\n// kill all perf_event css\\n                                // one perf_event css A is dying\\n                                // css A offline enqueues cgroup_destroy_wq\\n                                // root destruction will be executed first\\n                                css_free_rwork_fn\\n                                cgroup_destroy_root\\n                                cgroup_lock_and_drain_offline\\n                                // some perf descendants are dying\\n                                // cgroup_destroy_wq max_active = 1\\n                                // waiting for css A to die\\n\\nProblem scenario:\\n1. CPU0 mounts perf_event (rebind_subsystems)\\n2. CPU1 unmounts net_prio (cgroup_kill_sb), queuing root destruction work\\n3. A dying perf_event CSS gets queued for offline after root destruction\\n4. Root destruction waits for offline completion, but offline work is\\n   blocked behind root destruction in cgroup_destroy_wq (max_active=1)\\n\\nSolution:\\nSplit cgroup_destroy_wq into three dedicated workqueues:\\ncgroup_offline_wq \u2013 Handles CSS offline operations\\ncgroup_release_wq \u2013 Manages resource release\\ncgroup_free_wq \u2013 Performs final memory deallocation\\n\\nThis separation eliminates blocking in the CSS free path while waiting for\\noffline operations to complete.\\n\\n[1] https://github.com/linux-test-project/ltp/blob/master/runtest/controllers\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/05e0b03447cf215ec384210441b34b7a3b16e8b0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4a1e3ec28e8062cd9f339aa6a942df9c5bcb6811\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/79f919a89c9d06816dbdbbd168fa41d27411a7f9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/993049c9b1355c78918344a6403427d53f9ee700\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a0c896bda7077aa5005473e2c5b3c27173313b4c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cabadd7fd15f97090f752fd22dd7f876a0dc3dc4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ded4d207a3209a834b6831ceec7f39b934c74802\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f2795d1b92506e3adf52a298f7181032a1525e04\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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