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Vulnerabilities

Vulnerability · CVE-2025-38643

In the Linux kernel, the following vulnerability has been resolved: wifi: cfg80211: Add missing lock in cfg80211_check_and_end_cac() Callers of wdev_chandef() must hold the wiphy m

Published Aug 22, 2025 · catalog updated Oct 15, 2026 · Linux Linux

Check if you run it

No confirmed exploitation is on record for CVE-2025-38643. EPSS is 0.18%. Act only if a listed version of Linux Linux is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.18%
Remediation
Advisory link
Affected products
cpe linux/linux kernel · vendor Linux Linux patch: 6.16.1

In the Linux kernel, the following vulnerability has been resolved: wifi: cfg80211: Add missing lock in cfg80211_check_and_end_cac() Callers of wdev_chandef() must hold the wiphy mutex. But the worker cfg80211_propagate_cac_done_wk() never takes the lock. Which triggers the warning below with the mesh_peer_connected_dfs test from hostapd and not (yet) released mac80211 code changes: WARNING: CPU: 0 PID: 495 at net/wireless/chan.c:1552 wdev_chandef+0x60/0x165 Modules linked in: CPU: 0 UID: 0 PID: 495 Comm: kworker/u4:2 Not tainted 6.14.0-rc5-wt-g03960e6f9d47 #33 13c287eeabfe1efea01c0bcc863723ab082e17cf Workqueue: cfg80211 cfg80211_propagate_cac_done_wk Stack: 00000000 00000001 ffffff00 6093267c 00000000 6002ec30 6d577c50 60037608 00000000 67e8d108 6063717b 00000000 Call Trace: [ ] ? _printk+0x0/0x98 [ ] show_stack+0x10e/0x11a [ ] ? _printk+0x0/0x98 [ ] dump_stack_lvl+0x71/0xb8 [ ] ? wdev_chandef+0x60/0x165 [ ] dump_stack+0x1e/0x20 [ ] __warn+0x101/0x20f [ ] warn_slowpath_fmt+0xe3/0x15d [ ] ? mark_lock.part.0+0x0/0x4ec [ ] ? __this_cpu_preempt_check+0x0/0x16 [ ] ? mark_held_locks+0x5a/0x6e [ ] ? warn_slowpath_fmt+0x0/0x15d [ ] ? unblock_signals+0x3a/0xe7 [ ] ? um_set_signals+0x2d/0x43 [ ] ? __this_cpu_preempt_check+0x0/0x16 [ ] ? lock_is_held_type+0x207/0x21f [ ] wdev_chandef+0x60/0x165 [ ] regulatory_propagate_dfs_state+0x247/0x43f [ ] ? um_set_signals+0x0/0x43 [ ] cfg80211_propagate_cac_done_wk+0x3a/0x4a [ ] process_scheduled_works+0x3bc/0x60e [ ] ? move_linked_works+0x4d/0x81 [ ] ? assign_work+0x0/0xaa [ ] worker_thread+0x220/0x2dc [ ] ? set_pf_worker+0x0/0x57 [ ] ? to_kthread+0x0/0x43 [ ] kthread+0x2d3/0x2e2 [ ] ? worker_thread+0x0/0x2dc [ ] ? calculate_sigpending+0x0/0x56 [ ] new_thread_handler+0x4a/0x64 irq event stamp: 614611 hardirqs last enabled at (614621): [ ] __up_console_sem+0x82/0xaf hardirqs last disabled at (614630): [ ] __up_console_sem+0x43/0xaf softirqs last enabled at (614268): [ ] __ieee80211_wake_queue+0x933/0x985 softirqs last disabled at (61426

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe linux/linux kernel5.5
  • vendor Linux Linux patch: 6.16.1patch: 6.16.1

How to fix CVE-2025-38643

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-38643. EPSS is 0.18%. Act only if a listed version of Linux Linux is installed.

Which versions are affected?

Compare what you have installed with linux/linux kernel 5.5; Linux Linux patch: 6.16.1 patch: 6.16.1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-667. EPSS 0.18%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Aug 22, 2025 · NIST NVD

    Detected

    In the Linux kernel, the following vulnerability has been resolved: wifi: cfg80211: Add missing lock in cfg80211_check_and_end_cac() Callers of wdev_chandef() must hold the wiphy mutex. But the worker cfg80211_propagate_cac_done_wk() never takes the lock. Which triggers the warning below with the mesh_peer_connected_dfs test from hostapd and not (yet) released mac80211 code changes: WARNING: CPU:

  2. Oct 15, 2026 · NIST NVD

    Updated

    In the Linux kernel, the following vulnerability has been resolved: wifi: cfg80211: Add missing lock in cfg80211_check_and_end_cac() Callers of wdev_chandef() must hold the wiphy mutex. But the worker cfg80211_propagate_cac_done_wk() never takes the lock. Which triggers the warning below with the mesh_peer_connected_dfs test from hostapd and not (yet) released mac80211 code changes: WARNING: CPU:

Sources

  • CVE.orgVulnerability recordCVE-2025-38643

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-38643

    30-day exploitation probability 0.2%

    first.org
  • EUVDVulnerability recordEUVD-2025-25559

    In the Linux kernel, the following vulnerability has been resolved: wifi: cfg80211: Add missing lock in cfg80211_check_and_end_cac() Callers of wdev_chandef() must hold the wiphy mutex. But the worker cfg80211_propagate_cac_done_wk() never takes the lock. Which triggers the warni

    euvd.enisa.europa.eu
  • NIST NVDVulnerability recordCVE-2025-38643

    In the Linux kernel, the following vulnerability has been resolved: wifi: cfg80211: Add missing lock in cfg80211_check_and_end_cac() Callers of wdev_chandef() must hold the wiphy mutex. But the worker cfg80211_propagate_cac_done_wk() never takes the lock. Which triggers the wa

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.