Description
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]
Metrics
CVSS 3.1 5.5/10
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= b27512368591fc959768df1f7dacf2a96b1bd036, < 65c25b588994dd422fea73fa322de56e1ae4a33b; >= b27512368591fc959768df1f7dacf2a96b1bd036, < 5a86d4e920d9783a198e39cf53f0e410fba5fbd6; >= b27512368591fc959768df1f7dacf2a96b1bd036, < 3c6629e859a2211a1fbb4868f915413f80001ca5; >= b27512368591fc959768df1f7dacf2a96b1bd036, < 672e5229e1ecfc2a3509b53adcb914d8b024a853 |
| Linux | Linux | 6.11 |
References
- https://git.kernel.org/stable/c/3c6629e859a2211a1fbb4868f915413f80001ca5Patch
- https://git.kernel.org/stable/c/5a86d4e920d9783a198e39cf53f0e410fba5fbd6Patch
- https://git.kernel.org/stable/c/65c25b588994dd422fea73fa322de56e1ae4a33bPatch
- https://git.kernel.org/stable/c/672e5229e1ecfc2a3509b53adcb914d8b024a853Patch
Timeline
- Published
- Apr 3, 2026
- Last modified
- Jul 24, 2026
- NVD status
- Analyzed