CVE-2025-38643

/// Technical description

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:

[<6002ec30>] ? _printk+0x0/0x98

[<6003c2b3>] show_stack+0x10e/0x11a

[<6002ec30>] ? _printk+0x0/0x98

[<60037608>] dump_stack_lvl+0x71/0xb8

[<6063717b>] ? wdev_chandef+0x60/0x165

[<6003766d>] dump_stack

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References