CVE-2025-71079 (GCVE-0-2025-71079)

Vulnerability from cvelistv5 – Published: 2026-01-13 15:34 – Updated: 2026-01-13 15:34
VLAI?
Title
net: nfc: fix deadlock between nfc_unregister_device and rfkill_fop_write
Summary
In the Linux kernel, the following vulnerability has been resolved: net: nfc: fix deadlock between nfc_unregister_device and rfkill_fop_write A deadlock can occur between nfc_unregister_device() and rfkill_fop_write() due to lock ordering inversion between device_lock and rfkill_global_mutex. The problematic lock order is: Thread A (rfkill_fop_write): rfkill_fop_write() mutex_lock(&rfkill_global_mutex) rfkill_set_block() nfc_rfkill_set_block() nfc_dev_down() device_lock(&dev->dev) <- waits for device_lock Thread B (nfc_unregister_device): nfc_unregister_device() device_lock(&dev->dev) rfkill_unregister() mutex_lock(&rfkill_global_mutex) <- waits for rfkill_global_mutex This creates a classic ABBA deadlock scenario. Fix this by moving rfkill_unregister() and rfkill_destroy() outside the device_lock critical section. Store the rfkill pointer in a local variable before releasing the lock, then call rfkill_unregister() after releasing device_lock. This change is safe because rfkill_fop_write() holds rfkill_global_mutex while calling the rfkill callbacks, and rfkill_unregister() also acquires rfkill_global_mutex before cleanup. Therefore, rfkill_unregister() will wait for any ongoing callback to complete before proceeding, and device_del() is only called after rfkill_unregister() returns, preventing any use-after-free. The similar lock ordering in nfc_register_device() (device_lock -> rfkill_global_mutex via rfkill_register) is safe because during registration the device is not yet in rfkill_list, so no concurrent rfkill operations can occur on this device.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 3e3b5dfcd16a3e254aab61bd1e8c417dd4503102 , < ee41f4f3ccf8cd6ba3732e867abbec7e6d8d12e5 (git)
Affected: 3e3b5dfcd16a3e254aab61bd1e8c417dd4503102 , < 6b93c8ab6f6cda8818983a4ae3fcf84b023037b4 (git)
Affected: 3e3b5dfcd16a3e254aab61bd1e8c417dd4503102 , < 8fc4632fb508432895430cd02b38086bdd649083 (git)
Affected: 3e3b5dfcd16a3e254aab61bd1e8c417dd4503102 , < f3a8a7c1aa278f2378b2f3a10500c6674dffdfda (git)
Affected: 3e3b5dfcd16a3e254aab61bd1e8c417dd4503102 , < 1ab526d97a57e44d26fadcc0e9adeb9c0c0182f5 (git)
Affected: 5ef16d2d172ee56714cff37cd005b98aba08ef5a (git)
Affected: ff169909eac9e00bf1aa0af739ba6ddfb1b1d135 (git)
Affected: 47244ac0b65bd74cc70007d8e1bac68bd2baad19 (git)
Affected: c45cea83e13699bdfd47842e04d09dd43af4c371 (git)
Affected: 307d2e6cebfca9d92f86c8e2c8e3dd4a8be46ba6 (git)
Affected: 73a0d12114b4bc1a9def79a623264754b9df698e (git)
Affected: 8a9c61c3ef187d8891225f9b932390670a43a0d3 (git)
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    Linux Linux Affected: 5.16
Unaffected: 0 , < 5.16 (semver)
Unaffected: 6.1.160 , ≤ 6.1.* (semver)
Unaffected: 6.6.120 , ≤ 6.6.* (semver)
Unaffected: 6.12.64 , ≤ 6.12.* (semver)
Unaffected: 6.18.4 , ≤ 6.18.* (semver)
Unaffected: 6.19-rc4 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: nfc: fix deadlock between nfc_unregister_device and rfkill_fop_write\n\nA deadlock can occur between nfc_unregister_device() and rfkill_fop_write()\ndue to lock ordering inversion between device_lock and rfkill_global_mutex.\n\nThe problematic lock order is:\n\nThread A (rfkill_fop_write):\n  rfkill_fop_write()\n    mutex_lock(\u0026rfkill_global_mutex)\n      rfkill_set_block()\n        nfc_rfkill_set_block()\n          nfc_dev_down()\n            device_lock(\u0026dev-\u003edev)    \u003c- waits for device_lock\n\nThread B (nfc_unregister_device):\n  nfc_unregister_device()\n    device_lock(\u0026dev-\u003edev)\n      rfkill_unregister()\n        mutex_lock(\u0026rfkill_global_mutex)  \u003c- waits for rfkill_global_mutex\n\nThis creates a classic ABBA deadlock scenario.\n\nFix this by moving rfkill_unregister() and rfkill_destroy() outside the\ndevice_lock critical section. Store the rfkill pointer in a local variable\nbefore releasing the lock, then call rfkill_unregister() after releasing\ndevice_lock.\n\nThis change is safe because rfkill_fop_write() holds rfkill_global_mutex\nwhile calling the rfkill callbacks, and rfkill_unregister() also acquires\nrfkill_global_mutex before cleanup. Therefore, rfkill_unregister() will\nwait for any ongoing callback to complete before proceeding, and\ndevice_del() is only called after rfkill_unregister() returns, preventing\nany use-after-free.\n\nThe similar lock ordering in nfc_register_device() (device_lock -\u003e\nrfkill_global_mutex via rfkill_register) is safe because during\nregistration the device is not yet in rfkill_list, so no concurrent\nrfkill operations can occur on this device."
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        "dateUpdated": "2026-01-13T15:34:44.136Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/1ab526d97a57e44d26fadcc0e9adeb9c0c0182f5"
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      "title": "net: nfc: fix deadlock between nfc_unregister_device and rfkill_fop_write",
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    "cveId": "CVE-2025-71079",
    "datePublished": "2026-01-13T15:34:44.136Z",
    "dateReserved": "2026-01-13T15:30:19.648Z",
    "dateUpdated": "2026-01-13T15:34:44.136Z",
    "state": "PUBLISHED"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-71079\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-01-13T16:16:07.433\",\"lastModified\":\"2026-01-13T16:16:07.433\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: nfc: fix deadlock between nfc_unregister_device and rfkill_fop_write\\n\\nA deadlock can occur between nfc_unregister_device() and rfkill_fop_write()\\ndue to lock ordering inversion between device_lock and rfkill_global_mutex.\\n\\nThe problematic lock order is:\\n\\nThread A (rfkill_fop_write):\\n  rfkill_fop_write()\\n    mutex_lock(\u0026rfkill_global_mutex)\\n      rfkill_set_block()\\n        nfc_rfkill_set_block()\\n          nfc_dev_down()\\n            device_lock(\u0026dev-\u003edev)    \u003c- waits for device_lock\\n\\nThread B (nfc_unregister_device):\\n  nfc_unregister_device()\\n    device_lock(\u0026dev-\u003edev)\\n      rfkill_unregister()\\n        mutex_lock(\u0026rfkill_global_mutex)  \u003c- waits for rfkill_global_mutex\\n\\nThis creates a classic ABBA deadlock scenario.\\n\\nFix this by moving rfkill_unregister() and rfkill_destroy() outside the\\ndevice_lock critical section. Store the rfkill pointer in a local variable\\nbefore releasing the lock, then call rfkill_unregister() after releasing\\ndevice_lock.\\n\\nThis change is safe because rfkill_fop_write() holds rfkill_global_mutex\\nwhile calling the rfkill callbacks, and rfkill_unregister() also acquires\\nrfkill_global_mutex before cleanup. Therefore, rfkill_unregister() will\\nwait for any ongoing callback to complete before proceeding, and\\ndevice_del() is only called after rfkill_unregister() returns, preventing\\nany use-after-free.\\n\\nThe similar lock ordering in nfc_register_device() (device_lock -\u003e\\nrfkill_global_mutex via rfkill_register) is safe because during\\nregistration the device is not yet in rfkill_list, so no concurrent\\nrfkill operations can occur on this device.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1ab526d97a57e44d26fadcc0e9adeb9c0c0182f5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6b93c8ab6f6cda8818983a4ae3fcf84b023037b4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8fc4632fb508432895430cd02b38086bdd649083\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ee41f4f3ccf8cd6ba3732e867abbec7e6d8d12e5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f3a8a7c1aa278f2378b2f3a10500c6674dffdfda\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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