CVE-2025-38450

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> wifi: mt76: mt7925: prevent NULL pointer dereference in mt7925_sta_set_decap_offload()<br /> <br /> Add a NULL check for msta-&gt;vif before accessing its members to prevent<br /> a kernel panic in AP mode deployment. This also fix the issue reported<br /> in [1].<br /> <br /> The crash occurs when this function is triggered before the station is<br /> fully initialized. The call trace shows a page fault at<br /> mt7925_sta_set_decap_offload() due to accessing resources when msta-&gt;vif<br /> is NULL.<br /> <br /> Fix this by adding an early return if msta-&gt;vif is NULL and also check<br /> wcid.sta is ready. This ensures we only proceed with decap offload<br /> configuration when the station&amp;#39;s state is properly initialized.<br /> <br /> [14739.655703] Unable to handle kernel paging request at virtual address ffffffffffffffa0<br /> [14739.811820] CPU: 0 UID: 0 PID: 895854 Comm: hostapd Tainted: G<br /> [14739.821394] Tainted: [C]=CRAP, [O]=OOT_MODULE<br /> [14739.825746] Hardware name: Raspberry Pi 4 Model B Rev 1.1 (DT)<br /> [14739.831577] pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)<br /> [14739.838538] pc : mt7925_sta_set_decap_offload+0xc0/0x1b8 [mt7925_common]<br /> [14739.845271] lr : mt7925_sta_set_decap_offload+0x58/0x1b8 [mt7925_common]<br /> [14739.851985] sp : ffffffc085efb500<br /> [14739.855295] x29: ffffffc085efb500 x28: 0000000000000000 x27: ffffff807803a158<br /> [14739.862436] x26: ffffff8041ececb8 x25: 0000000000000001 x24: 0000000000000001<br /> [14739.869577] x23: 0000000000000001 x22: 0000000000000008 x21: ffffff8041ecea88<br /> [14739.876715] x20: ffffff8041c19ca0 x19: ffffff8078031fe0 x18: 0000000000000000<br /> [14739.883853] x17: 0000000000000000 x16: ffffffe2aeac1110 x15: 000000559da48080<br /> [14739.890991] x14: 0000000000000001 x13: 0000000000000000 x12: 0000000000000000<br /> [14739.898130] x11: 0a10020001008e88 x10: 0000000000001a50 x9 : ffffffe26457bfa0<br /> [14739.905269] x8 : ffffff8042013bb0 x7 : ffffff807fb6cbf8 x6 : dead000000000100<br /> [14739.912407] x5 : dead000000000122 x4 : ffffff80780326c8 x3 : 0000000000000000<br /> [14739.919546] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffffff8041ececb8<br /> [14739.926686] Call trace:<br /> [14739.929130] mt7925_sta_set_decap_offload+0xc0/0x1b8 [mt7925_common]<br /> [14739.935505] ieee80211_check_fast_rx+0x19c/0x510 [mac80211]<br /> [14739.941344] _sta_info_move_state+0xe4/0x510 [mac80211]<br /> [14739.946860] sta_info_move_state+0x1c/0x30 [mac80211]<br /> [14739.952116] sta_apply_auth_flags.constprop.0+0x90/0x1b0 [mac80211]<br /> [14739.958708] sta_apply_parameters+0x234/0x5e0 [mac80211]<br /> [14739.964332] ieee80211_add_station+0xdc/0x190 [mac80211]<br /> [14739.969950] nl80211_new_station+0x46c/0x670 [cfg80211]<br /> [14739.975516] genl_family_rcv_msg_doit+0xdc/0x150<br /> [14739.980158] genl_rcv_msg+0x218/0x298<br /> [14739.983830] netlink_rcv_skb+0x64/0x138<br /> [14739.987670] genl_rcv+0x40/0x60<br /> [14739.990816] netlink_unicast+0x314/0x380<br /> [14739.994742] netlink_sendmsg+0x198/0x3f0<br /> [14739.998664] __sock_sendmsg+0x64/0xc0<br /> [14740.002324] ____sys_sendmsg+0x260/0x298<br /> [14740.006242] ___sys_sendmsg+0xb4/0x110