{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-38643",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2025-38643"
  ],
  "published": "2025-08-22T16:01:13Z",
  "summary": "wifi: cfg80211: Add missing lock in cfg80211_check_and_end_cac()",
  "details": "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() 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",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-38643"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/defe9ce121160788547e8e6ec4438ad8a14f40dd"
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      "url": "https://git.kernel.org/stable/c/b3d24038eb775f2f7a1dfef58d8e1dc444a12820"
    },
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    },
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      "url": "https://git.kernel.org/stable/c/dbce810607726408f889d3358f4780fd1436861e"
    },
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T12:19:11Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:A - The vulnerable worker is driven by DFS events on the 802.11 stack \u2014 radar detection, which an attacker in RF range can force on demand by transmitting DFS radar pulse patterns, and CAC completion during normal AP/mesh operation; the racing side is driven by remote peer activity (mesh peering, association, channel switch) on a second radio. This is same-RF-segment reach, matching the WiFi = Adjacent classification.\nAC:L - The attacker controls both sides of the race \u2014 radar-event injection can be repeated indefinitely to re-arm the unlocked worker while over-the-air traffic keeps the second wiphy busy in mutex-protected chanctx work. The guaranteed lockdep WARN in wdev_chandef() needs no race at all, only the multi-radio DFS configuration that is standard on AP/mesh hardware.\nPR:N - No credentials or local account are needed; radar pulse injection and mesh/association frames require no authentication to the target, and CAC-finished events occur during ordinary AP operation. The attacker holds no privileges on the affected system.\nUI:N - No victim action is required \u2014 the worker runs automatically from the cfg80211 workqueue whenever a DFS radar or CAC-finished event propagates to another wiphy.\nS:U - The corruption and crash are confined to the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Running __ieee80211_link_release_channel() without the wiphy mutex races chanctx refcounting and can free a struct ieee80211_chanctx still referenced by another link, yielding a use-after-free on a heap object whose contents are influenceable via crafted channel parameters \u2014 a UAF read primitive over kernel memory.\nI:H - The same unsynchronized free/reassign of chanctx state gives a write-after-free into a reallocated slab object, and the unlocked mutation of link chanctx pointers and CAC state corrupts wiphy-mutex-protected structures \u2014 memory corruption exploitable for control-flow hijack.\nA:H - The path unconditionally hits the lockdep_assert_wiphy() WARN in wdev_chandef(), which panics on panic_on_warn systems, and the chanctx refcount/list corruption and use-after-free produce kernel oopses and panics on the affected AP."
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}