CVE-2026-23167

Local denial of service via rfkill teardown race

Published Feb 14, 2026 · Updated Feb 14, 2026

Race condition in the Linux kernel NFC NCI subsystem allows local users to interrupt kernel availability through rfkill teardown. nci_unregister_device() destroys cmd_wq before unregistering the NFC device's rfkill interface, allowing nci_close_device() to access the destroyed workqueue. A low-privileged local process must race rfkill access against virtual NCI device closure; the published report observed a lockdep warning without a reproducer.

CVSS severity4.7
Medium
EPSS probability0.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in the Linux kernel NFC NCI subsystem allows local users to interrupt kernel availability through rfkill teardown. nci_unregister_device() destroys cmd_wq before unregistering the NFC device's rfkill interface, allowing nci_close_device() to access the destroyed workqueue. A low-privileged local process must race rfkill access against virtual NCI device closure; the published report observed a lockdep warning without a reproducer.

The record

CVE
CVE-2026-23167
Published
Feb 14, 2026
Updated
Feb 14, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-362, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.2
  2. Affected versionversion=6a2968aaf50c7a22fced77a5e24aa636281efca8 <126cd30cad37bc7c2c85fe2df2a522d4edf0a5c5
  3. Affected versionversion=6a2968aaf50c7a22fced77a5e24aa636281efca8 <546eba0b10989de9ccc7fd619e874a30561e2b88
  4. Affected versionversion=6a2968aaf50c7a22fced77a5e24aa636281efca8 <8ea4d96419fb20f15a52ce657d49f1e7c91eb7ac
  5. Affected versionversion=6a2968aaf50c7a22fced77a5e24aa636281efca8 <c3369fc5e6120a72169e71acd72e987907a682af
  6. Affected versionversion=6a2968aaf50c7a22fced77a5e24aa636281efca8 <cd4412d5905ee580e96c48360dc98fcd9e6f3208
  7. Affected versionversion=6a2968aaf50c7a22fced77a5e24aa636281efca8 <d2492688bb9fed6ab6e313682c387ae71a66ebae
  8. Affected versionversion=6a2968aaf50c7a22fced77a5e24aa636281efca8 <eaa5da5130deda26420273d4610cf6e4f794ed75

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3.2; version=6a2968aaf50c7a22fced77a5e24aa636281efca8 <126cd30cad37bc7c2c85fe2df2a522d4edf0a5c5; version=6a2968aaf50c7a22fced77a5e24aa636281efca8 <546eba0b10989de9ccc7fd619e874a30561e2b88; version=6a2968aaf50c7a22fced77a5e24aa636281efca8 <8ea4d96419fb20f15a52ce657d49f1e7c91eb7ac; version=6a2968aaf50c7a22fced77a5e24aa636281efca8 <c3369fc5e6120a72169e71acd72e987907a682af; version=6a2968aaf50c7a22fced77a5e24aa636281efca8 <cd4412d5905ee580e96c48360dc98fcd9e6f3208; version=6a2968aaf50c7a22fced77a5e24aa636281efca8 <d2492688bb9fed6ab6e313682c387ae71a66ebae; version=6a2968aaf50c7a22fced77a5e24aa636281efca8 <eaa5da5130deda26420273d4610cf6e4f794ed75

Published CVSS scores

4.7NIST NVDCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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