CVE-2026-31394
Description
AI Translation Available
In the Linux kernel, the following vulnerability has been resolved:
mac80211: fix crash in ieee80211_chan_bw_change for AP_VLAN stations
ieee80211_chan_bw_change() iterates all stations and accesses
link->reserved.oper via sta->sdata->link[link_id]. For stations on
AP_VLAN interfaces (e.g. 4addr WDS clients), sta->sdata points to
the VLAN sdata, whose link never participates in chanctx reservations.
This leaves link->reserved.oper zero-initialized with chan == NULL,
causing a NULL pointer dereference in __ieee80211_sta_cap_rx_bw()
when accessing chandef->chan->band during CSA.
Resolve the VLAN sdata to its parent AP sdata using get_bss_sdata()
before accessing link data.
[also change sta->sdata in ARRAY_SIZE even if it doesn't matter]
https://git.kernel.org/stable/c/3c6629e859a2211a1fbb4868f915413f80001ca5
https://git.kernel.org/stable/c/5a86d4e920d9783a198e39cf53f0e410fba5fbd6
https://git.kernel.org/stable/c/65c25b588994dd422fea73fa322de56e1ae4a33b
https://git.kernel.org/stable/c/672e5229e1ecfc2a3509b53adcb914d8b024a853