{"id":"CVE-2025-38643","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: cfg80211: Add missing lock in cfg80211_check_and_end_cac()\n\nCallers of wdev_chandef() must hold the wiphy mutex.\n\nBut the worker cfg80211_propagate_cac_done_wk() …","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: cfg80211: Add missing lock in cfg80211_check_and_end_cac()\n\nCallers of wdev_chandef() must hold the wiphy mutex.\n\nBut the worker cfg80211_propagate_cac_done_wk() …","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-667"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 4.14.170, < 4.15","linux_kernel >= 4.19.102, < 4.20","linux_kernel >= 5.4.18, < 5.5","linux_kernel >= 5.5.1, < 6.6.118","linux_kernel >= 6.7, < 6.12.57","linux_kernel >= 6.13, < 6.15.10","linux_kernel >= 6.16, < 6.16.1","linux_kernel = 5.5"],"patched":["linux_kernel 6.16.1"],"published":"2025-08-22","updated":"2026-10-15","sourceUpdated":"2026-10-15T22:18:48.070","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-38643","references":[{"url":"https://git.kernel.org/stable/c/2c5dee15239f3f3e31aa5c8808f18996c039e2c1","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/4a63523d3541eef4cf504a9682e6fbe94ffe79a6","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7022df2248c08c6f75a01714163ac902333bf3db","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b3d24038eb775f2f7a1dfef58d8e1dc444a12820","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/dbce810607726408f889d3358f4780fd1436861e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/defe9ce121160788547e8e6ec4438ad8a14f40dd","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38643.json"},{"url":"https://access.redhat.com/security/cve/CVE-2025-38643"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2390401"},{"url":"https://www.cve.org/CVERecord?id=CVE-2025-38643"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-38643"},{"url":"https://lore.kernel.org/linux-cve-announce/2025082235-CVE-2025-38643-a281@gregkh/T"}],"tags":["nvd","csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00186,"epssPercentile":0.08173,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-15T21:52:31.279965Z"},"scores":{"nvd":8.8,"vendor":4.1,"cna":8.8},"ingestedAt":"2026-10-15T22:48:25.517Z","slug":"CVE-2025-38643","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nwifi: cfg80211: Add missing lock in cfg80211_check_and_end_cac()\n\nCallers of wdev_chandef() must hold the wiphy mutex.\n\nBut the worker cfg80211_propagate_cac_done_wk() never takes the lock.\nWhich triggers the warning below with the mesh_peer_connected_dfs\ntest from hostapd and not (yet) released mac80211 code changes:\n\nWARNING: CPU: 0 PID: 495 at net/wireless/chan.c:1552 wdev_chandef+0x60/0x165\nModules linked in:\nCPU: 0 UID: 0 PID: 495 Comm: kworker/u4:2 Not tainted 6.14.0-rc5-wt-g03960e6f9d47 #33 13c287eeabfe1efea01c0bcc863723ab082e17cf\nWorkqueue: cfg80211 cfg80211_propagate_cac_done_wk\nStack:\n 00000000 00000001 ffffff00 6093267c\n 00000000 6002ec30 6d577c50 60037608\n 00000000 67e8d108 6063717b 00000000\nCall Trace:\n [<6002ec30>] ? _printk+0x0/0x98\n [<6003c2b3>] show_stack+0x10e/0x11a\n [<6002ec30>] ? _printk+0x0/0x98\n [<60037608>] dump_stack_lvl+0x71/0xb8\n [<6063717b>] ? wdev_chandef+0x60/0x165\n [<6003766d>] dump_stack+0x1e/0x20\n [<6005d1b7>] __warn+0x101/0x20f\n [<6005d3a8>] warn_slowpath_fmt+0xe3/0x15d\n [<600b0c5c>] ? mark_lock.part.0+0x0/0x4ec\n [<60751191>] ? __this_cpu_preempt_check+0x0/0x16\n [<600b11a2>] ? mark_held_locks+0x5a/0x6e\n [<6005d2c5>] ? warn_slowpath_fmt+0x0/0x15d\n [<60052e53>] ? unblock_signals+0x3a/0xe7\n [<60052f2d>] ? um_set_signals+0x2d/0x43\n [<60751191>] ? __this_cpu_preempt_check+0x0/0x16\n [<607508b2>] ? lock_is_held_type+0x207/0x21f\n [<6063717b>] wdev_chandef+0x60/0x165\n [<605f89b4>] regulatory_propagate_dfs_state+0x247/0x43f\n [<60052f00>] ? um_set_signals+0x0/0x43\n [<605e6bfd>] cfg80211_propagate_cac_done_wk+0x3a/0x4a\n [<6007e460>] process_scheduled_works+0x3bc/0x60e\n [<6007d0ec>] ? move_linked_works+0x4d/0x81\n [<6007d120>] ? assign_work+0x0/0xaa\n [<6007f81f>] worker_thread+0x220/0x2dc\n [<600786ef>] ? set_pf_worker+0x0/0x57\n [<60087c96>] ? to_kthread+0x0/0x43\n [<6008ab3c>] kthread+0x2d3/0x2e2\n [<6007f5ff>] ? worker_thread+0x0/0x2dc\n [<6006c05b>] ? calculate_sigpending+0x0/0x56\n [<6003b37d>] new_thread_handler+0x4a/0x64\nirq event stamp: 614611\nhardirqs last  enabled at (614621): [<00000000600bc96b>] __up_console_sem+0x82/0xaf\nhardirqs last disabled at (614630): [<00000000600bc92c>] __up_console_sem+0x43/0xaf\nsoftirqs last  enabled at (614268): [<00000000606c55c6>] __ieee80211_wake_queue+0x933/0x985\nsoftirqs last disabled at (614266): [<00000000606c52d6>] __ieee80211_wake_queue+0x643/0x985\n\n## Affected\n\n- `linux_kernel >= 4.14.170, < 4.15`\n- `linux_kernel >= 4.19.102, < 4.20`\n- `linux_kernel >= 5.4.18, < 5.5`\n- `linux_kernel >= 5.5.1, < 6.6.118`\n- `linux_kernel >= 6.7, < 6.12.57`\n- `linux_kernel >= 6.13, < 6.15.10`\n- `linux_kernel >= 6.16, < 6.16.1`\n- `linux_kernel = 5.5`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.16.1`\n\n## Vendor advisories\n\n- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · updated 2026-10-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38643.json)","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":230063,"id":"CVE-2025-38643","ts":1793124778620,"field":"cvss","old":"4.1","new":"8.8"},{"seq":230062,"id":"CVE-2025-38643","ts":1793124778620,"field":"severity","old":"medium","new":"high"},{"seq":223668,"id":"CVE-2025-38643","ts":1792238363158,"field":"cvss","old":"8.8","new":"4.1"},{"seq":223667,"id":"CVE-2025-38643","ts":1792238363158,"field":"severity","old":"high","new":"medium"}]}