5.5

CVE-2025-71079: net: nfc: fix deadlock between nfc_unregister_device and rfkill_fop_write

Modified
AliasesUBUNTU-CVE-2025-71079DEBIAN-CVE-2025-71079
Published 13-01-2026Last modified 15-10-2026

Vulnerability summary

CVE-2025-71079 is a medium (CVSS 5.5) Improper Locking vulnerability in linux. EPSS estimates a 0.11% chance of exploitation in the next 30 days, higher than 1.1% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.11%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 46 · Related 42
DLA-4475-1DLA-4476-1DSA-6126-1DSA-6127-1MGASA-2026-0017MGASA-2026-0018

Timeline

  1. 13-01-2026
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

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 metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.11%

Chance of exploitation in the next 30 days

Percentile

1%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.10% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu156 products
  • linuxAll versions (No fix recorded) | < 5.15.0-173.183 | < 6.8.0-110.110 | < 6.17.0-22.22
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1103.110 | < 6.8.0-1052.55 | < 6.17.0-1012.12
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 73a0d12114b4bc1a9def79a623264754b9df698e, < 2e0831e9fc46a06daa6d4d8d57a2738e343130c3 | ≥ 8a9c61c3ef187d8891225f9b932390670a43a0d3, < e02a1c33f10a0ed3aba855ab8ae2b6c4c5be8012 | ≥ 3e3b5dfcd16a3e254aab61bd1e8c417dd4503102, < ee41f4f3ccf8cd6ba3732e867abbec7e6d8d12e5 | ≥ 3e3b5dfcd16a3e254aab61bd1e8c417dd4503102, < 6b93c8ab6f6cda8818983a4ae3fcf84b023037b4 | ≥ 3e3b5dfcd16a3e254aab61bd1e8c417dd4503102, < 8fc4632fb508432895430cd02b38086bdd649083 | ≥ 3e3b5dfcd16a3e254aab61bd1e8c417dd4503102, < f3a8a7c1aa278f2378b2f3a10500c6674dffdfda | ≥ 3e3b5dfcd16a3e254aab61bd1e8c417dd4503102, < 1ab526d97a57e44d26fadcc0e9adeb9c0c0182f5 | 5ef16d2d172ee56714cff37cd005b98aba08ef5a | ff169909eac9e00bf1aa0af739ba6ddfb1b1d135 | 47244ac0b65bd74cc70007d8e1bac68bd2baad19 | c45cea83e13699bdfd47842e04d09dd43af4c371 | 307d2e6cebfca9d92f86c8e2c8e3dd4a8be46ba6 | ≥ 5.10.82, < 5.10.248 | ≥ 5.15.5, < 5.15.198 | ≥ 4.4.293, < 4.5 | ≥ 4.9.291, < 4.10 | ≥ 4.14.256, < 4.15 | ≥ 4.19.218, < 4.20 | ≥ 5.4.162, < 5.5 | 5.16
  • linux_kernelEOL≥ 4.4.293, < 4.5 | ≥ 4.9.291, < 4.10 | ≥ 4.14.256, < 4.15 | ≥ 4.19.218, < 4.20 | ≥ 5.4.162, < 5.5 | ≥ 5.10.82, < 5.10.248 | ≥ 5.15.5, < 5.15.198 | ≥ 5.16.1, < 6.1.160 | ≥ 6.2, < 6.6.120 | ≥ 6.7, < 6.12.64 | ≥ 6.13, < 6.18.4 | 5.16 | 6.19:rc1 | 6.19:rc2 | 6.19:rc3 | 6.19:rc4 | 6.19:rc5 | 6.19:rc6 | 6.19:rc7 | 6.19:rc8
Debian1 product
  • linux< 6.1.162-1 | < 6.12.69-1 | < 6.18.5-1

3 vendors · 159 products

References

44 links
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