CVE-2025-71079net: nfc: fix deadlock between nfc_unregister_device and rfkill_fop_write
Updated under an hour ago ()
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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.
- CVSS
- 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 73a0d12114b4bc1a9def79a623264754b9df698e builds before 2e0831e9fc46a06daa6d4d8d57a2738e343130c3; from 8a9c61c3ef187d8891225f9b932390670a43a0d3 before e02a1c33f10a0ed3aba855ab8ae2b6c4c5be8012; from 3e3b5dfcd16a3e254aab61bd1e8c417dd4503102 before ee41f4f3ccf8cd6ba3732e867abbec7e6d8d12e5; from 3e3b5dfcd16a3e254aab61bd1e8c417dd4503102 before 6b93c8ab6f6cda8818983a4ae3fcf84b023037b4; from 3e3b5dfcd16a3e254aab61bd1e8c417dd4503102 before 8fc4632fb508432895430cd02b38086bdd649083; from 3e3b5dfcd16a3e254aab61bd1e8c417dd4503102 before f3a8a7c1aa278f2378b2f3a10500c6674dffdfda; 3e3b5dfcd16a3e254aab61bd1e8c417dd4503102 builds before 1ab526d97a57e44d26fadcc0e9adeb9c0c0182f5; 5ef16d2d172ee56714cff37cd005b98aba08ef5a; and 11 more ranges | CNA record |
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
linux linux_kernel linux:linux_kernel | from 4.4.293 before 4.5; from 4.9.291 before 4.10; from 4.14.256 before 4.15; from 4.19.218 before 4.20; from 5.4.162 before 5.5; from 5.10.82 before 5.10.248; from 5.15.5 before 5.15.198; from 5.16.1 before 6.1.160; and 12 more ranges | NVD |
References
- https://git.kernel.org/stable/c/2e0831e9fc46a06daa6d4d8d57a2738e343130c3patch
- https://git.kernel.org/stable/c/e02a1c33f10a0ed3aba855ab8ae2b6c4c5be8012patch
- https://git.kernel.org/stable/c/ee41f4f3ccf8cd6ba3732e867abbec7e6d8d12e5patch
- https://git.kernel.org/stable/c/6b93c8ab6f6cda8818983a4ae3fcf84b023037b4patch
- https://git.kernel.org/stable/c/8fc4632fb508432895430cd02b38086bdd649083patch
- https://git.kernel.org/stable/c/f3a8a7c1aa278f2378b2f3a10500c6674dffdfdapatch
- https://git.kernel.org/stable/c/1ab526d97a57e44d26fadcc0e9adeb9c0c0182f5patch
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.