CVE-2025-38643

In the Linux kernel, the following vulnerability has been resolved:

wifi: cfg80211: Add missing lock in cfg80211checkandendcac()

Callers of wdev_chandef() must hold the wiphy mutex.

But the worker cfg80211propagatecacdonewk() never takes the lock. Which triggers the warning below with the meshpeerconnected_dfs test from hostapd and not (yet) released mac80211 code changes:

WARNING: CPU: 0 PID: 495 at net/wireless/chan.c:1552 wdevchandef+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 cfg80211propagatecacdonewk Stack: 00000000 00000001 ffffff00 6093267c 00000000 6002ec30 6d577c50 60037608 00000000 67e8d108 6063717b 00000000 Call Trace: [<6002ec30>] ? _printk+0x0/0x98 [<6003c2b3>] showstack+0x10e/0x11a [<6002ec30>] ? printk+0x0/0x98 [<60037608>] dumpstacklvl+0x71/0xb8 [<6063717b>] ? wdevchandef+0x60/0x165 [<6003766d>] dumpstack+0x1e/0x20 [<6005d1b7>] _warn+0x101/0x20f [<6005d3a8>] warnslowpathfmt+0xe3/0x15d [<600b0c5c>] ? marklock.part.0+0x0/0x4ec [<60751191>] ? _thiscpupreemptcheck+0x0/0x16 [<600b11a2>] ? markheldlocks+0x5a/0x6e [<6005d2c5>] ? warnslowpathfmt+0x0/0x15d [<60052e53>] ? unblocksignals+0x3a/0xe7 [<60052f2d>] ? umsetsignals+0x2d/0x43 [<60751191>] ? _thiscpupreemptcheck+0x0/0x16 [<607508b2>] ? lockisheldtype+0x207/0x21f [<6063717b>] wdevchandef+0x60/0x165 [<605f89b4>] regulatorypropagatedfsstate+0x247/0x43f [<60052f00>] ? umsetsignals+0x0/0x43 [<605e6bfd>] cfg80211propagatecacdonewk+0x3a/0x4a [<6007e460>] processscheduledworks+0x3bc/0x60e [<6007d0ec>] ? movelinkedworks+0x4d/0x81 [<6007d120>] ? assignwork+0x0/0xaa [<6007f81f>] workerthread+0x220/0x2dc [<600786ef>] ? setpfworker+0x0/0x57 [<60087c96>] ? tokthread+0x0/0x43 [<6008ab3c>] kthread+0x2d3/0x2e2 [<6007f5ff>] ? workerthread+0x0/0x2dc [<6006c05b>] ? calculatesigpending+0x0/0x56 [<6003b37d>] newthreadhandler+0x4a/0x64 irq event stamp: 614611 hardirqs last enabled at (614621): [<00000000600bc96b>] _upconsolesem+0x82/0xaf hardirqs last disabled at (614630): [<00000000600bc92c>] _upconsolesem+0x43/0xaf softirqs last enabled at (614268): [<00000000606c55c6>] _ieee80211wakequeue+0x933/0x985 softirqs last disabled at (614266): [<00000000606c52d6>] _ieee80211wakequeue+0x643/0x985