net: nfc: fix deadlock between nfc_unregister_device and rfkill_fop_write

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-71079
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-01-13 16:16:07 UTC
Updated2026-07-14 13:18:01 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-667

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 73a0d12114b4bc1a9def79a623264754b9df698e 2e0831e9fc46a06daa6d4d8d57a2738e343130c3 git Not specified
CNA Linux Linux affected 8a9c61c3ef187d8891225f9b932390670a43a0d3 e02a1c33f10a0ed3aba855ab8ae2b6c4c5be8012 git Not specified
CNA Linux Linux affected 3e3b5dfcd16a3e254aab61bd1e8c417dd4503102 ee41f4f3ccf8cd6ba3732e867abbec7e6d8d12e5 git Not specified
CNA Linux Linux affected 3e3b5dfcd16a3e254aab61bd1e8c417dd4503102 6b93c8ab6f6cda8818983a4ae3fcf84b023037b4 git Not specified
CNA Linux Linux affected 3e3b5dfcd16a3e254aab61bd1e8c417dd4503102 8fc4632fb508432895430cd02b38086bdd649083 git Not specified
CNA Linux Linux affected 3e3b5dfcd16a3e254aab61bd1e8c417dd4503102 f3a8a7c1aa278f2378b2f3a10500c6674dffdfda git Not specified
CNA Linux Linux affected 3e3b5dfcd16a3e254aab61bd1e8c417dd4503102 1ab526d97a57e44d26fadcc0e9adeb9c0c0182f5 git Not specified
CNA Linux Linux affected 5ef16d2d172ee56714cff37cd005b98aba08ef5a git Not specified
CNA Linux Linux affected ff169909eac9e00bf1aa0af739ba6ddfb1b1d135 git Not specified
CNA Linux Linux affected 47244ac0b65bd74cc70007d8e1bac68bd2baad19 git Not specified
CNA Linux Linux affected c45cea83e13699bdfd47842e04d09dd43af4c371 git Not specified
CNA Linux Linux affected 307d2e6cebfca9d92f86c8e2c8e3dd4a8be46ba6 git Not specified
CNA Linux Linux affected 5.10.82 5.10.248 semver Not specified
CNA Linux Linux affected 5.15.5 5.15.198 semver Not specified
CNA Linux Linux affected 4.4.293 4.5 semver Not specified
CNA Linux Linux affected 4.9.291 4.10 semver Not specified
CNA Linux Linux affected 4.14.256 4.15 semver Not specified
CNA Linux Linux affected 4.19.218 4.20 semver Not specified
CNA Linux Linux affected 5.4.162 5.5 semver Not specified
CNA Linux Linux affected 5.16 Not specified
CNA Linux Linux unaffected 5.16 semver Not specified
CNA Linux Linux unaffected 5.10.248 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.198 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.160 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.120 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.64 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.4 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19 * original_commit_for_fix Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.6 * custom Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2e0831e9fc46a06daa6d4d8d57a2738e343130c3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
cert-portal.siemens.com/productcert/html/ssa-019113.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/1ab526d97a57e44d26fadcc0e9adeb9c0c0182f5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/6b93c8ab6f6cda8818983a4ae3fcf84b023037b4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/8fc4632fb508432895430cd02b38086bdd649083 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f3a8a7c1aa278f2378b2f3a10500c6674dffdfda 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/e02a1c33f10a0ed3aba855ab8ae2b6c4c5be8012 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/ee41f4f3ccf8cd6ba3732e867abbec7e6d8d12e5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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