CVE-2026-31394

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]

The following products are affected by CVE-2026-31394 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-31394.

URL	Resource
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
https://lore.kernel.org/linux-cve-announce/2026040325-CVE-2026-31394-26ac@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2026-31394
https://www.cve.org/CVERecord?id=CVE-2026-31394