CVE-2026-31394
5.5 MEDIUMIn the Linux kernel, the following vulnerability has been resolved: mac80211: fix crash in ieee80211_chan_bw_change for AP_VLAN stations...
Published: 2026-04-03 · Last updated: 2026-05-20
Severity and scoring
- CVSS
- 5.5 MEDIUM
- Vector
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- CWE
- CWE-476
Affected products
| Vendor | Product |
|---|---|
| linux | linux_kernel |
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]
Source: NVD
References
- [NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-31394
- [Patch]https://git.kernel.org/stable/c/3c6629e859a2211a1fbb4868f915413f80001ca5
- [Patch]https://git.kernel.org/stable/c/5a86d4e920d9783a198e39cf53f0e410fba5fbd6
- [Patch]https://git.kernel.org/stable/c/65c25b588994dd422fea73fa322de56e1ae4a33b
- [Patch]https://git.kernel.org/stable/c/672e5229e1ecfc2a3509b53adcb914d8b024a853
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