net: nfc: fix deadlock between nfc_unregister_device and rfkill_fop_write

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.

Timeline

Scores

EPSS (exploitation in 30 days)

0.11% · top 99% of all CVEs (9 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.

Weakness

• CWE-667 (opens in a new tab)All about CWE-667 and its CVEs

Affected products

• Linux · Linux

  • affected 73a0d12114b4bc1a9def79a623264754b9df698e – < 2e0831e9fc46a06daa6d4d8d57a2738e343130c3
  • affected 8a9c61c3ef187d8891225f9b932390670a43a0d3 – < e02a1c33f10a0ed3aba855ab8ae2b6c4c5be8012
  • affected 3e3b5dfcd16a3e254aab61bd1e8c417dd4503102 – < ee41f4f3ccf8cd6ba3732e867abbec7e6d8d12e5
  • affected 3e3b5dfcd16a3e254aab61bd1e8c417dd4503102 – < 6b93c8ab6f6cda8818983a4ae3fcf84b023037b4
  • affected 3e3b5dfcd16a3e254aab61bd1e8c417dd4503102 – < 8fc4632fb508432895430cd02b38086bdd649083
  • affected 3e3b5dfcd16a3e254aab61bd1e8c417dd4503102 – < f3a8a7c1aa278f2378b2f3a10500c6674dffdfda
  • affected 3e3b5dfcd16a3e254aab61bd1e8c417dd4503102 – < 1ab526d97a57e44d26fadcc0e9adeb9c0c0182f5
  • affected 5ef16d2d172ee56714cff37cd005b98aba08ef5a
  • affected ff169909eac9e00bf1aa0af739ba6ddfb1b1d135
  • affected 47244ac0b65bd74cc70007d8e1bac68bd2baad19
  • affected c45cea83e13699bdfd47842e04d09dd43af4c371
  • affected 307d2e6cebfca9d92f86c8e2c8e3dd4a8be46ba6
  • affected 5.10.82 – < 5.10.248
  • affected 5.15.5 – < 5.15.198
  • affected 4.4.293 – < 4.5
  • affected 4.9.291 – < 4.10
  • affected 4.14.256 – < 4.15
  • affected 4.19.218 – < 4.20
  • affected 5.4.162 – < 5.5

• Linux · Linux

  • affected 5.16
  • unaffected < 5.16
  • unaffected 5.10.248 – ≤ 5.10.*
  • unaffected 5.15.198 – ≤ 5.15.*
  • unaffected 6.1.160 – ≤ 6.1.*
  • unaffected 6.6.120 – ≤ 6.6.*
  • unaffected 6.12.64 – ≤ 6.12.*
  • unaffected 6.18.4 – ≤ 6.18.*
  • unaffected 6.19 – ≤ *

References (9)

• https://git.kernel.org/stable/c/2e0831e9fc46a06daa6d4d8d57a2738e343130c3 (opens in a new tab)
• https://git.kernel.org/stable/c/e02a1c33f10a0ed3aba855ab8ae2b6c4c5be8012 (opens in a new tab)
• https://git.kernel.org/stable/c/ee41f4f3ccf8cd6ba3732e867abbec7e6d8d12e5 (opens in a new tab)
• https://git.kernel.org/stable/c/6b93c8ab6f6cda8818983a4ae3fcf84b023037b4 (opens in a new tab)
• https://git.kernel.org/stable/c/8fc4632fb508432895430cd02b38086bdd649083 (opens in a new tab)
• https://git.kernel.org/stable/c/f3a8a7c1aa278f2378b2f3a10500c6674dffdfda (opens in a new tab)
• https://git.kernel.org/stable/c/1ab526d97a57e44d26fadcc0e9adeb9c0c0182f5 (opens in a new tab)
• https://cert-portal.siemens.com/productcert/html/ssa-019113.html (opens in a new tab)
• https://cert-portal.siemens.com/productcert/html/ssa-457936.html (opens in a new tab)

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• EUVD EUVD-2026-2243 (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2025-71079](https://cveledger.app/badge/CVE-2025-71079.svg)](https://cveledger.app/cve/CVE-2025-71079)

Record last updated 15 Oct 2026, 01:10 UTC.