CVE-2025-71079

MEDIUM EPSS 0.5%
Published Jan 13, 20265mo ago · Modified Jun 17, 20262w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Jan 13, 2026 5mo ago
Last Modified Jun 17, 2026 2w ago

Description

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 Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
0.5% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-667

Affected Products 20

VendorProductVersionRange
linuxlinux_kernel*≥4.4.293  –  <4.5
linuxlinux_kernel*≥4.9.291  –  <4.10
linuxlinux_kernel*≥4.14.256  –  <4.15
linuxlinux_kernel*≥4.19.218  –  <4.20
linuxlinux_kernel*≥5.4.162  –  <5.5
linuxlinux_kernel*≥5.10.82  –  <5.10.248
linuxlinux_kernel*≥5.15.5  –  <5.15.198
linuxlinux_kernel*≥5.16.1  –  <6.1.160
linuxlinux_kernel*≥6.2  –  <6.6.120
linuxlinux_kernel*≥6.7  –  <6.12.64
linuxlinux_kernel*≥6.13  –  <6.18.4
linuxlinux_kernel5.16any
linuxlinux_kernel6.19any
linuxlinux_kernel6.19any
linuxlinux_kernel6.19any
linuxlinux_kernel6.19any
linuxlinux_kernel6.19any
linuxlinux_kernel6.19any
linuxlinux_kernel6.19any
linuxlinux_kernel6.19any

References 7

  • git.kernel.org https://git.kernel.org/stable/c/1ab526d97a57e44d26fadcc0e9adeb9c0c0182f5
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/2e0831e9fc46a06daa6d4d8d57a2738e343130c3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6b93c8ab6f6cda8818983a4ae3fcf84b023037b4
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8fc4632fb508432895430cd02b38086bdd649083
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e02a1c33f10a0ed3aba855ab8ae2b6c4c5be8012
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ee41f4f3ccf8cd6ba3732e867abbec7e6d8d12e5
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f3a8a7c1aa278f2378b2f3a10500c6674dffdfda
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/1ab526d97a57e44d26fadcc0e9adeb9c0c0182f5
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/2e0831e9fc46a06daa6d4d8d57a2738e343130c3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6b93c8ab6f6cda8818983a4ae3fcf84b023037b4
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8fc4632fb508432895430cd02b38086bdd649083
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e02a1c33f10a0ed3aba855ab8ae2b6c4c5be8012
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ee41f4f3ccf8cd6ba3732e867abbec7e6d8d12e5
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f3a8a7c1aa278f2378b2f3a10500c6674dffdfda
    Patch