{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-40321",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-40321"
  ],
  "published": "2025-12-08T00:47:38Z",
  "summary": "wifi: brcmfmac: fix crash while sending Action Frames in standalone AP Mode",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: brcmfmac: fix crash while sending Action Frames in standalone AP Mode\n\nCurrently, whenever there is a need to transmit an Action frame,\nthe brcmfmac driver always uses the P2P vif to send the \"actframe\" IOVAR to\nfirmware. The P2P interfaces were available when wpa_supplicant is managing\nthe wlan interface.\n\nHowever, the P2P interfaces are not created/initialized when only hostapd\nis managing the wlan interface. And if hostapd receives an ANQP Query REQ\nAction frame even from an un-associated STA, the brcmfmac driver tries\nto use an uninitialized P2P vif pointer for sending the IOVAR to firmware.\nThis NULL pointer dereferencing triggers a driver crash.\n\n [ 1417.074538] Unable to handle kernel NULL pointer dereference at virtual\n address 0000000000000000\n [...]\n [ 1417.075188] Hardware name: Raspberry Pi 4 Model B Rev 1.5 (DT)\n [...]\n [ 1417.075653] Call trace:\n [ 1417.075662]  brcmf_p2p_send_action_frame+0x23c/0xc58 [brcmfmac]\n [ 1417.075738]  brcmf_cfg80211_mgmt_tx+0x304/0x5c0 [brcmfmac]\n [ 1417.075810]  cfg80211_mlme_mgmt_tx+0x1b0/0x428 [cfg80211]\n [ 1417.076067]  nl80211_tx_mgmt+0x238/0x388 [cfg80211]\n [ 1417.076281]  genl_family_rcv_msg_doit+0xe0/0x158\n [ 1417.076302]  genl_rcv_msg+0x220/0x2a0\n [ 1417.076317]  netlink_rcv_skb+0x68/0x140\n [ 1417.076330]  genl_rcv+0x40/0x60\n [ 1417.076343]  netlink_unicast+0x330/0x3b8\n [ 1417.076357]  netlink_sendmsg+0x19c/0x3f8\n [ 1417.076370]  __sock_sendmsg+0x64/0xc0\n [ 1417.076391]  ____sys_sendmsg+0x268/0x2a0\n [ 1417.076408]  ___sys_sendmsg+0xb8/0x118\n [ 1417.076427]  __sys_sendmsg+0x90/0xf8\n [ 1417.076445]  __arm64_sys_sendmsg+0x2c/0x40\n [ 1417.076465]  invoke_syscall+0x50/0x120\n [ 1417.076486]  el0_svc_common.constprop.0+0x48/0xf0\n [ 1417.076506]  do_el0_svc+0x24/0x38\n [ 1417.076525]  el0_svc+0x30/0x100\n [ 1417.076548]  el0t_64_sync_handler+0x100/0x130\n [ 1417.076569]  el0t_64_sync+0x190/0x198\n [ 1417.076589] Code: f9401e80 aa1603e2 f9403be1 5280e483 (f9400000)\n\nFix this, by always using the vif corresponding to the wdev on which the\nAction frame Transmission request was initiated by the userspace. This way,\neven if P2P vif is not available, the IOVAR is sent to firmware on AP vif\nand the ANQP Query RESP Action frame is transmitted without crashing the\ndriver.\n\nMove init_completion() for \"send_af_done\" from brcmf_p2p_create_p2pdev()\nto brcmf_p2p_attach(). Because the former function would not get executed\nwhen only hostapd is managing wlan interface, and it is not safe to do\nreinit_completion() later in brcmf_p2p_tx_action_frame(), without any prior\ninit_completion().\n\nAnd in the brcmf_p2p_tx_action_frame() function, the condition check for\nP2P Presence response frame is not needed, since the wpa_supplicant is\nproperly sending the P2P Presense Response frame on the P2P-GO vif instead\nof the P2P-Device vif.\n\n[Cc stable]",
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